junit加载配置文件出错

错误信息如下:

 Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'testServiceImpl': Unsatisfied dependency expressed through field 'userInfoDao'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userInfoDao' defined in file [E:\EclipseWorkspace\mvn-springmvc\target\classes\com\dao\user\UserInfoDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [spring/applicationContext-dao.xml]: Cannot resolve reference to bean 'dataSource' while setting bean property 'dataSource'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [spring/applicationContext-dao.xml]: Instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: org/apache/juli/logging/LogFactory

applicationContext-service.xml配置

 <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-4.3.xsd">


    <!-- 扫描包 controller,service-->
    <context:component-scan base-package="com.serviceimpl"></context:component-scan>

</beans>

applicationContext-dao.xml配置

 <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context.xsd
                        http://www.springframework.org/schema/tx
                        http://www.springframework.org/schema/tx/spring-tx-4.2.xsd"
    default-lazy-init="false">

    <!-- 加载资源文件 -->
    <context:property-placeholder ignore-resource-not-found="true" location="classpath:conf/*.properties"/>

    <!-- 使用spring 加载jdbc驱动 -->
    <bean id="dataSourceTemplate"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${driver}" />
        <property name="url" value="${url}" />
        <property name="username" value="${uname}" />
        <property name="password" value="${password}" />
    </bean>

    <!-- 数据连接池 -->
    <bean id="dataSource" class="org.apache.tomcat.jdbc.pool.DataSource"
        destroy-method="close">
        <property name="poolProperties">
            <bean class="org.apache.tomcat.jdbc.pool.PoolProperties">
                <!-- 通过引用加载数据库信息 -->
                <property name="dataSource" ref="dataSourceTemplate" />
                <property name="jmxEnabled" value="true" />
                <property name="testWhileIdle" value="true" />
                <property name="testOnBorrow" value="true" />
                <property name="testOnReturn" value="false" />
                <property name="validationInterval" value="30000" />
                <property name="validationQuery" value="SELECT 1" />
                <property name="timeBetweenEvictionRunsMillis" value="30000" />
                <property name="logAbandoned" value="false" />
                <property name="removeAbandoned" value="true" />
                <property name="removeAbandonedTimeout" value="60" />
                <!-- 初始化连接大小 -->
                <property name="initialSize" value="10"></property>
                <!-- 连接池最大数量 -->
                <property name="maxActive" value="200"></property>
                <!-- 连接池最小空闲 -->
                <property name="minIdle" value="10"></property>
                <!-- 获取连接最大等待时间 -->
                <property name="maxWait" value="60000"></property>
                <property name="jdbcInterceptors"
                    value="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer" />
            </bean>
        </property>
    </bean>

    <!-- MyBatis配置 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 数据库连接池 -->
        <property name="dataSource" ref="dataSource" />
        <!-- 自动扫描entity目录, 省掉Configuration.xml里的手工配置 -->
        <property name="typeAliasesPackage" value="com.model" />
        <!-- mybatis位置 -->
        <property name="configLocation" value="classpath:/mybatis/mybatis.xml" />
        <!-- 显式指定Mapper文件位置 -->
        <property name="mapperLocations" value="classpath:/mybatis/**/*Mapper.xml" />
    </bean>

    <!-- DAO接口所在包名,Spring会自动查找其下的类 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.dao" />
    </bean>

    <!-- 配置Spring的事务管理器 -->
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- 注解方式配置事物 -->
    <tx:annotation-driven transaction-manager="transactionManager" />
</beans>

测试基类:

 package test.service;

import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * 测试基类
 *
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:/spring/applicationContext-service.xml","classpath:/spring/applicationContext-dao.xml","classpath:/spring/applicationContext-redis.xml"})
public class BaseTest {
    // "classpath:/spring/applicationContext-redis.xml"
    // extends AbstractTransactionalJUnit4SpringContextTests 需要回滚时继承
}

测试类

 package test.service.test;

import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;

import com.service.test.TestService;

import test.service.BaseTest;

public class TestServiceTest extends BaseTest {

    @Autowired
    private TestService testService;

    @Test
    public void test() {
        System.out.println(testService.getUserInfo().getUserName());
    }
}

说明:项目能正常启动,正常运行。但是juint测试的时候就出问题了。
到现在都没找出原因。欲哭无泪啊!求帮助

1个回答

Csdn user default icon
上传中...
上传图片
插入图片
抄袭、复制答案,以达到刷声望分或其他目的的行为,在CSDN问答是严格禁止的,一经发现立刻封号。是时候展现真正的技术了!
其他相关推荐
Spring单元测试Junit,麻烦大神帮忙看下
加载Spring的配置文件,在Spring框架里执行单元测试,加载配置文件不成功,错误如截图所示: java.lang.ExceptionInInitializerError at org.springframework.context.support.AbstractRefreshableApplicationContext.createBeanFactory(AbstractRefreshableApplicationContext.java:195) at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:128) at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:522) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:436) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83) at com.xdb.conform.SpringTest.setUpBeforeClass(SpringTest.java:17) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27) at org.junit.runners.ParentRunner.run(ParentRunner.java:300) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: java.lang.NullPointerException at org.springframework.beans.factory.support.DefaultListableBeanFactory.<clinit>(DefaultListableBeanFactory.java:106) ... 22 more
SpringJunit单元测试@ContextConfiguration无法加载依赖项目的beans
![图片中epp-web依赖其他所有项目,其他项目中有的都各自拥有自己的application.xml配置文件,当对b2b2c项目中的service进行单元测试时,需要引用base中的Dao方法,得到dao对象为null![b2b2cActionContext属于b2b2c,dataAccessContext-jdbc属于base 执行 run junit 时 就出错说 can not load Application ,单独加载一个b2b2cActionContext.xml时OK的](https://img-ask.csdn.net/upload/201507/01/1435751956_274549.png)](https://img-ask.csdn.net/upload/201507/01/1435751592_615431.png)在b2b2c项目中做单元测试时,无法加载base项目中的Spring Application jdbc的配置文件 导致获得的JDBC对象为空,请大侠指导一下怎样才能在 b2b2c中对service对单元测试 可以加载base项目中的application-jdbc.xml配置文件获取到dao对象。
当我用maven+spring+junit4单元测试时报出错误,请各位看看我这是什么问题?
当我运行此代码时 ``` @RunWith(SpringJUnit4ClassRunner.class) //使用junit4进行测试 @ContextConfiguration(locations={"classpath:spring/applicationContext*.xml"}) //加载配置文件 public class JunitTest { @Autowired private ProjectDao prjDao; @BeforeClass public static void init() throws NamingException { ClassPathXmlApplicationContext app =new ClassPathXmlApplicationContext("classpath:junit4/InitJndi.xml"); DataSource ds =(DataSource) app.getBean("dataSource"); SimpleNamingContextBuilder builder =new SimpleNamingContextBuilder(); builder.bind("java:/comp/env/jdbc/egrant", ds); builder.activate(); } @Test @Transactional //标明此方法需使用事务 @Rollback(false) //标明使用完此方法后事务不回滚,true时为回滚 public void testAdd() { System.out.println("测试Spring整合Junit4进行单元测试"); Project prj = new Project(); prj.setZhTitle("Junit4Test"); prjDao.save(prj); } } ``` 出现下面错误 ![图片说明](https://img-ask.csdn.net/upload/201810/31/1540972687_556650.png) 进行调试后发现是这两个jar有问题,但是不知道为什么,我试着改变pom.xml的jar包顺序 但是还是没有作用。 javaee-web-api-6.0.jar spring-web-3.2.0.RELEASE.jar pom文件 spring版本 ``` <spring.version>3.2.0.RELEASE</spring.version> ``` junit ``` <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.8.2</version> <scope>test</scope> </dependency> ``` j2ee ``` <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId> <version>6.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax</groupId> <artifactId>javaee-web-api</artifactId> <version>6.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> ```
Spring aop配置事务出错。
**出现 无法加载Failed to load ApplicationContext ,注释掉aop的配置能正常运行** ``` <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd"> <!-- 依赖关系 dao->jdbcTemplate->dataSource --> <!-- 读取配置文件 --> <context:property-placeholder location="db.properties" /> <!-- dataSource --> <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driverClass}" /> <property name="jdbcUrl" value="${jdbc.jdbcUrl}" /> <property name="user" value="${jdbc.user}" /> <property name="password" value="${jdbc.password}" /> </bean> <!-- dao --> <bean name="accountDao" class="com.sikiedu.dao.AccountDaoImpl"> <property name="dataSource" ref="dataSource" /> </bean> <!-- service --> <bean name="accountService" class="com.sikiedu.service.AccountServiceImpl"> <property name="ad" ref="accountDao" /> </bean> <!-- 配置事务核心管理器 不同平台不一样 --> <bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 事务通知 --> <tx:advice id="txAdivce" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="transferAccounts" isolation="DEFAULT" propagation="REQUIRED" read-only="false" /> </tx:attributes> </tx:advice> ** <!-- 配置aop --> <aop:config> <aop:pointcut expression="execution(* com.sikiedu.service.*ServiceImpl.*(..))" id="txPc" /> <aop:advisor advice-ref="txAdivce" pointcut-ref="txPc" /> </aop:config> </beans> ** ``` ``` @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("classpath:applicationContext.xml") public class TxTest { @Resource(name="accountService") private AccountService as; @Test public void Test() { as.transferAccounts(); } ``` java.lang.IllegalStateException: Failed to load ApplicationContext at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:125) at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:108) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:118) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83) at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:246) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:89) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209) Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: Could not initialize class org.aspectj.util.LangUtil at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:845) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:128) at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60) at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:275) at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:243) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117) ... 25 more Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.aspectj.util.LangUtil at org.aspectj.weaver.reflect.ReflectionWorld.<init>(ReflectionWorld.java:52) at org.aspectj.weaver.tools.PointcutParser.setClassLoader(PointcutParser.java:221) at org.aspectj.weaver.tools.PointcutParser.<init>(PointcutParser.java:207) at org.aspectj.weaver.tools.PointcutParser.getPointcutParserSupportingSpecifiedPrimitivesAndUsingSpecifiedClassLoaderForResolution(PointcutParser.java:168) at org.springframework.aop.aspectj.AspectJExpressionPointcut.initializePointcutParser(AspectJExpressionPointcut.java:242) at org.springframework.aop.aspectj.AspectJExpressionPointcut.buildPointcutExpression(AspectJExpressionPointcut.java:221) at org.springframework.aop.aspectj.AspectJExpressionPointcut.obtainPointcutExpression(AspectJExpressionPointcut.java:198) at org.springframework.aop.aspectj.AspectJExpressionPointcut.getClassFilter(AspectJExpressionPointcut.java:177) at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:225) at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:288) at org.springframework.aop.support.AopUtils.findAdvisorsThatCanApply(AopUtils.java:320) at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findAdvisorsThatCanApply(AbstractAdvisorAutoProxyCreator.java:126) at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findEligibleAdvisors(AbstractAdvisorAutoProxyCreator.java:95) at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.getAdvicesAndAdvisorsForBean(AbstractAdvisorAutoProxyCreator.java:76) at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:347) at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:299) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:429) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1782) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ... 39 more ![图片说明](https://img-ask.csdn.net/upload/201907/30/1564452632_681928.png)
java.lang.IllegalStateException: Failed to load ApplicationContext
java.lang.IllegalStateException: Failed to load ApplicationContext at org.springframework.test.context.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:91) at org.springframework.test.context.DefaultTestContext.getApplicationContext(DefaultTestContext.java:74) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:116) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:82) at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:212) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:199) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:251) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:253) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:216) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:82) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:60) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:67) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:162) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: javax/persistence/EntityListeners at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1568) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:540) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:706) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480) at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:125) at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60) at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:108) at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:260) at org.springframework.test.context.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:63) at org.springframework.test.context.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:83) ... 25 more Caused by: java.lang.NoClassDefFoundError: javax/persistence/EntityListeners at org.hibernate.cfg.annotations.reflection.JPAMetadataProvider.getDefaults(JPAMetadataProvider.java:96) at org.hibernate.annotations.common.reflection.java.JavaReflectionManager.getDefaults(JavaReflectionManager.java:226) at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1385) at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1375) at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:658) at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:189) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1627) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1564) ... 40 more Caused by: java.lang.ClassNotFoundException: javax.persistence.EntityListeners at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 48 more 在SSH整合的时候遇见的错误,我的applicationContext.xml代码如下: <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 加载hibernate.cfg.xml 获得SessionFactory --> <bean name="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <!-- 确定配置文件的位置 --> <property name="configLocation" value="classpath:hibernate.cfg.xml"></property> </bean> <!-- 创建模板 --> <bean name="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate"> <property name="sessionFactory" ref="sessionFactory"></property> </bean> <!-- dao --> <bean name="userDao" class="com.shanmu.dao.impl.UserDaoImpl"> <property name="hibernateTemplate" ref="hibernateTemplate"></property> </bean> <!-- service --> <bean name="userService" class="com.shanmu.service.impl.UserServiceImpl"> <property name="userDao" ref="userDao"></property> </bean> <!-- 事务管理 --> <!-- 事务管理器:HibernateTransactionManager --> <bean name="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory"></property> </bean> <!-- 事务详情 --> <tx:advice id="txAdvice" transaction-manager="txManager"> <tx:attributes> <tx:method name="register"/> </tx:attributes> </tx:advice> <!-- AOP编程 --> <aop:config> <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.shanmu.service..*.*(..))"/> </aop:config> </beans> 但是一直报错,检查过代码问题没有错,检查过数据库,检查过路径,都没有错,网上的方法基本都试了,也没有错 求解
IDEA做SSM框架整合时,出现无法加载mapper,导致无法注入。
今日学习SSM框架整合,整合以后,单独用测试类可以连接成功连接数据库,可是一加入MVC用TOMCAT启动,项目就会报错,错误内容为:Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 以下为项目各部分截图,有没有大佬帮我分析下,问题到底出在哪? ========================================================================================================================================== ![项目报错详细情况](https://img-ask.csdn.net/upload/201908/15/1565880941_652575.png) ## 项目报错详细情况 ![spring配置文件已经配置了mapper.xml路径和齐对应的接口扫描包](https://img-ask.csdn.net/upload/201908/15/1565880955_958792.png) ## spring配置文件已经配置了mapper.xml路径和齐对应的接口扫描包 ![编译文件夹target里已经编译出了mapper相关配置文件及接口类](https://img-ask.csdn.net/upload/201908/15/1565881099_526884.png) ## 编译文件夹target里已经编译出了mapper相关配置文件及接口类 ![mapper.xml里的namespace已经指明了接口路径](https://img-ask.csdn.net/upload/201908/15/1565881139_161198.png) ## mapper.xml里的namespace已经指明了接口路径 ![pom文件里也配置了resource源](https://img-ask.csdn.net/upload/201908/15/1565881159_416309.png) ## pom文件里也配置了resource源 ========================================================================================================================================== # 详细代码已经贴在下方,只选了几个配置文件及mapper接口类,service及controller应该没关系就没传! ============================================= # mybatis-config.xml ``` <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!--添加缓存 引入第三方二级缓存 --> <settings> <setting name="mapUnderscoreToCamelCase" value="true"/> <setting name="cacheEnabled" value="false"/> </settings> <!-- 配置数据源 default默认使用的数据源 --> <environments default="mysql"> <environment id="mysql"> <transactionManager type="JDBC" /> <dataSource type="POOLED"> <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql:///orderuser"/> <property name="username" value="zhijia3278"/> <property name="password" value="0528"/> </dataSource> </environment> </environments> <!-- 映射文件 --> <mappers> <mapper resource="OrderUserMapper.xml"/> </mappers> </configuration> ``` # OrderUserMapper.java ``` package cn.tedu.mapper; import cn.tedu.domain.Order; import cn.tedu.domain.User; public interface OrderUserMapper { public User queryUser(String userId); public Order queryOrder(String orderId); public void updateUserPoints(User user); } ``` # OrderUserMapper.xml ``` <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="cn.tedu.mapper.OrderUserMapper"> <select id="queryUser" parameterType="String" resultType="User"> select * from t_user where user_id=#{userId} </select> <select id="queryOrder" parameterType="String" resultType="Order"> select * from t_order where order_id=#{orderId} </select> <update id="updateUserPoints" parameterType="User"> update t_user set points=#{points} where user_id=#{userId} </update> </mapper> ``` # spring.xml ``` <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" xmlns:util="http://www.springframework.org/schema/util" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 配置内容 --> <context:component-scan base-package="cn.tedu"> </context:component-scan> <context:annotation-config></context:annotation-config> <!-- 持久层数据源 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <!-- 4个属性 --> <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql:///orderuser"/> <property name="username" value="zhijia3278"/> <property name="password" value="0528"/> </bean> <!-- sqlSession --> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 数据源注入 --> <property name="dataSource" ref="dataSource"/> <!-- 扫描mybatis的独立配置文件 关闭二级缓存,驼峰命名 --> <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/> <!-- 映射文件扫描 --> <property name="mapperLocations" value="classpath:mapper/OrderUserMapper.xml" /> <!-- 别名包 --> <property name="typeAliasesPackage" value="cn.tedu.domain"></property> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 扫描的接口包 cn.tedu.mapper --> <property name="basePackage" value="cn.tedu.mapper"/> </bean> <!-- 注解驱动开启,@RequestMapping @RequestParam等 --> <mvc:annotation-driven/> <!-- 防止静态文件js css html访问被dispacherServlet拦截 --> <!-- localhost静态文件根目录 /static /js /css --> <!-- mapping 满足什么样子的访问地址 http://localhost:8080/js//1.js --> <mvc:resources location="/" mapping="/**"></mvc:resources> </beans> ``` # springmvc-servlet ``` <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" xmlns:util="http://www.springframework.org/schema/util" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 配置内容 --> <context:component-scan base-package="cn.tedu"/> <!-- 注解驱动开启,@RequestMapping @RequestParam等 --> <mvc:annotation-driven/> <!-- 防止静态文件js css html访问被dispacherServlet拦截 --> <!-- localhost静态文件根目录 /static /js /css --> <!-- mapping 满足什么样子的访问地址 http://localhost:8080/js//1.js --> <mvc:resources location="/" mapping="/**"></mvc:resources> </beans> ``` # web.xml ``` <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" > <web-app> <display-name>Archetype Created Web Application</display-name> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- tomcat启动加载spring.xml --> <!-- <init-param>--> <!-- <param-name>contextConfigLocation</param-name>--> <!-- <param-value>classpath:springmvc/springmvc-servlet.xml</param-value>--> <!-- </init-param>--> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app> ``` # pom.xml ``` <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>cn.tedu</groupId> <artifactId>SSMDemo</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <name>SSM-DEMO01 Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <!-- <dependency>--> <!-- <groupId>junit</groupId>--> <!-- <artifactId>junit</artifactId>--> <!-- <version>4.12</version>--> <!-- <scope>compile</scope>--> <!-- </dependency>--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.3.13.RELEASE</version> </dependency> <!-- datasource --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.14</version> </dependency> <!-- spring mysql --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.3.13.RELEASE</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.0.8</version> </dependency> <!-- mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.5</version> </dependency> <!-- spring mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.1</version> </dependency> <!-- springmvc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>4.3.13.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.3.13.RELEASE</version> </dependency> <!-- jackson --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.8.8</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.8.8</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.8.8</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency> </dependencies> <build> <finalName>SSM-DEMO01</finalName> <plugins> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>2.2</version> <!-- 插件属性配置 --> <configuration> <!-- 端口 --> <port>8080</port> <!-- 项目访问路径 --> <path>/</path> <!-- 编解码 --> <uriEncoding>utf-8</uriEncoding> <useBodyEncodingForURI>true</useBodyEncodingForURI> </configuration> </plugin> </plugins> <resources> <resource> <directory>resource</directory> <includes> <include>**/*.xml</include> <include>mapper/*.xml</include> <include>mybatis/*.xml</include> <include>spring/*.xml</include> </includes> <!-- <filtering>true</filtering>--> </resource> </resources> </build> </project> ```
使用junit运行freemarker找不到模板
我们是jsp项目,使用spring装配freemarker,在跑项目的时候正常,但是在跑testcase的时候报找不到模板 [color=brown]配置文件如下[/color] <bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer"> <property name="templateLoaderPath"[color=red] value="/WEB-INF/templates/"[/color] /> <!-- 配置模板加载路径 --> <property name="freemarkerSettings"><!-- 设置FreeMarker环境属性--> <props> <prop key="template_update_delay">1</prop> <!-- 刷新模板的周期,单位为秒 --> <!--<prop key="classic_compatible">true</prop>--> <!-- 此属性可以防止模板解析空值时的错误 --> <prop key="default_encoding">UTF-8</prop><!--模板的编码格式 --> <prop key="locale">zh_CN</prop><!-- 本地化设置--> <prop key="url_escaping_charset">UTF-8</prop> <prop key="datetime_format">yyyy-MM-dd HH:mm:ss</prop> <prop key="date_format">yyyy-MM-dd</prop> <prop key="time_format">HH:mm:ss</prop> <prop key="number_format">0.######</prop> <prop key="boolean_format">true,false</prop> <!--<prop key="auto_import">"/spring.ftl" as spring</prop> <prop key="whitespace_stripping">true</prop> <prop key="tag_syntax">auto_detect</prop> --> </props> </property> </bean> 项目是使用myeclipse向导创建的Web项目 [color=brown]配置文件的路径为[/color] /WebRoot/WEB-INF/templates/page/index.ftl 获得template的java代码如下 Template t = freemarkerConfig.getConfiguration().getTemplate("[color=red]/WEB-INF/templates/page/index.ftl[/color]"); 顺便说一下,我还尝试过 Template t = freemarkerConfig.getConfiguration().getTemplate("[color=red]/WebRoot/WEB-INF/templates/page/index.ftl[/color]"); Template t = freemarkerConfig.getConfiguration().getTemplate("[color=red]/templates/page/index.ftl[/color]"); Template t = freemarkerConfig.getConfiguration().getTemplate("[color=red]D:/myproject/WebRoot/WEB-INF/templates/page/index.ftl[/color]"); 再顺便说一下,我已经诅咒过spring得freemarker插件一万遍了,也没有啥用。 任何帮助或建议都不胜感激。
spring整合hibernate的sessionFactory,报以下错误
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'customerServiceImpl' defined in class path resource [applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'customerDaoImpl' of bean class [cn.itcast.ssh.service.impl.CustomerServiceImpl]: Bean property 'customerDaoImpl' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter? at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1518) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1226) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83) at cn.itcast.ssh.spring_sessionFactory.Spring_SessionFactory.test(Spring_SessionFactory.java:22) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:69) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) at org.junit.runners.ParentRunner.run(ParentRunner.java:292) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'customerDaoImpl' of bean class [cn.itcast.ssh.service.impl.CustomerServiceImpl]: Bean property 'customerDaoImpl' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter? at org.springframework.beans.BeanWrapperImpl.createNotWritablePropertyException(BeanWrapperImpl.java:231) at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:423) at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:280) at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:95) at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:75) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1514) ... 36 more **spring的配置文件如下**: <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <!-- 1.配置查询所有客户的bean对象,注入spring管理的sessionFactory对象 --> <bean id="customerDaoImpl" class="cn.itcast.ssh.dao.impl.CustomerDaoImpl"> <property name="sessionFactory" ref="sessionFactory"></property> </bean> <bean id="customerServiceImpl" class="cn.itcast.ssh.service.impl.CustomerServiceImpl"> <property name="customerDaoImpl" ref="customerDaoImpl"></property> </bean> <!-- 2.spring管理action的创建和service层注入 --> <bean id="findAllCustomer" class="cn.itcast.ssh.web.action.CustomerAction" scope="prototype"> <property name="customerServiceImpl" ref="customerServiceImpl"></property> </bean> <!-- 3.在spring配置sessionFactory,注入到dao中 ,就是在LocalSessionFactoryBean类中注入一个属性configLocation,其值value就是引用hibernate的sessionFactory--> <bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean"> <property name="configLocation" value="classpath:hibernate.cfg.xml"></property> </bean> ** 测试类代码如下** package cn.itcast.ssh.spring_sessionFactory; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import cn.itcast.ssh.domain.Customer; import cn.itcast.ssh.service.CustomerService; import cn.itcast.ssh.service.impl.CustomerServiceImpl; /** * * @author Hongqiankun 测试spring管理sessionFactory的创建,是否能用 1.手动加载spring的配置文件 * 2.获取serviceImpl的bean对象,调用save方法,由于save中使用了sessionFactory * 所以,如果spring没能成功注入sessionFactory,则程序保存,无法将新的客户信息录入到数据库; * */ public class Spring_SessionFactory { @Test public void test() { //1.加载spring的配置文件,获得CustomerServiceImpl对象 ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml"); CustomerService customerServiceImpl = (CustomerServiceImpl) context.getBean("customerServiceImpl"); //2.创建新的customer Customer cus = new Customer(); cus.setCustName("北方科技2"); cus.setCustAddress("北京"); cus.setCustIndustry("科技公司"); cus.setCustPhone("13214132344"); cus.setCustSource("推广"); cus.setCustLevel("普通客户"); //3.调用saveCustomer方法 customerServiceImpl.saveCustomer(cus); } } </beans>
hibernate中的事务问题
package cn.itcast.hibernatetest; import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import org.hibernate.cfg.Configuration; import org.junit.Test; import cn.itcast.entity.User; public class HibernateDemo { @Test public void testAdd() { //第一步 加载hibernate核心配置文件 //到src下面照到一个名词是hibernate.cfg.xml //在hibernate里面封装了一个对象 Configuration cfg=new Configuration(); cfg.configure(); //第二步,创建一个SessionFactory对象 //读取hibernate核心配置文件,创建sessionFactory //在过程中,根据映射关系,在配置数据库里面把表创建 SessionFactory sessionFactory = cfg.buildSessionFactory(); //第三步 使用SessionFactory创建session对象 //类似于连接 Session session = sessionFactory.openSession(); //第四步 开启事务 Transaction tx = session.beginTransaction(); //第五步 写具体逻辑crud操作 User user = new User(); user.setUsername("小王"); user.setPassword("250"); user.setAdress("日本"); //调用session的方法实现添加 session.save(user); //第六步 提交事务 tx.commit(); //第七步 关闭资源 session.close(); sessionFactory.close(); } } 代码tx.commit();报错,输入tx.的时候也没有提示commit()方法,为什么,错误提示好像是Transaction中没有commit方法? 错误提示如下: The type javax.persistence.EntityTransaction cannot be resolved. It is indirectly referenced from required .class files 有没有大神解答下,谢谢了
学ssh整合时遇到Error creating bean with name xxx问题,向大家请教
ssh整合,测试时遇到Error creating bean with name xxx问题,这个问题之前看到有很多人问,但是貌似没有什么解决方案。 跪求大佬们指点一二 这是完整的Debug错误信息: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testService' defined in file [E:\MyEclipseworkplace\Test2\WebRoot\WEB-INF\classes\cn\itcast\oa\test\TestService.class]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83) at cn.itcast.oa.test.SpringTest.<init>(SpringTest.java:10) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:526) at org.junit.runners.BlockJUnit4ClassRunner.createTest(BlockJUnit4ClassRunner.java:209) at org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:258) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:255) at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer at org.springframework.aop.framework.Cglib2AopProxy.createEnhancer(Cglib2AopProxy.java:228) at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:170) at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:112) at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:476) at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:362) at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:322) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:407) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1426) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) ... 34 more 我的Spring配置文件如下: <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"> <!-- 自动扫描与装配bean --> <context:component-scan base-package="cn.itcast.oa"></context:component-scan> <!-- 配置数据库连接池(c3p0) --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <!-- 基本信息 --> <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/itcastoa"></property> <property name="driverClass" value="com.mysql.jdbc.Driver"></property> <property name="user" value="root"></property> <property name="password" value="966536"></property> <!-- 其他配置 --> <!--初始化时获取三个连接,取值应在minPoolSize与maxPoolSize之间。Default: 3 --> <property name="initialPoolSize" value="3"></property> <!--连接池中保留的最小连接数。Default: 3 --> <property name="minPoolSize" value="3"></property> <!--连接池中保留的最大连接数。Default: 15 --> <property name="maxPoolSize" value="5"></property> <!--当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3 --> <property name="acquireIncrement" value="3"></property> <!-- 控制数据源内加载的PreparedStatements数量。如果maxStatements与maxStatementsPerConnection均为0,则缓存被关闭。Default: 0 --> <property name="maxStatements" value="8"></property> <!-- maxStatementsPerConnection定义了连接池内单个连接所拥有的最大缓存statements数。Default: 0 --> <property name="maxStatementsPerConnection" value="5"></property> <!--最大空闲时间,1800秒内未使用则连接被丢弃。若为0则永不丢弃。Default: 0 --> <property name="maxIdleTime" value="1800"></property> </bean> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="configLocation" value="classpath:hibernate.cfg.xml"> </property> </bean> <!-- 配置声明式的事务管理(采用基于注解的方式) --> <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory"></property> </bean> <tx:annotation-driven transaction-manager="transactionManager"/> </beans> 我的测试代码如下: package cn.itcast.oa.test; import org.hibernate.SessionFactory; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class SpringTest { private ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml"); // 测试SessionFactory @Test public void testSessionFactory() throws Exception { SessionFactory sessionFactory = (SessionFactory) ac.getBean("sessionFactory"); System.out.println(sessionFactory); } // 测试事务 @Test public void testTransaction() throws Exception { TestService testService = (TestService) ac.getBean("testService"); testService.saveTwoUsers(); } }
spring集成hibernate,事务处理错误问题
小弟初学hibernate,用spring集成hibernate时候,主动加载事务处理 , 出现错误,向大家请教。 [color=red]Manager类代码:[/color] [color=red]OrgManagerImpl 继承 HibernateDaoSupport 其中findOrg方法代码为[/color] public Organization findOrg(int orgId) { // TODO Auto-generated method stub return (Organization) getHibernateTemplate().[color=red]get[/color](Organization.class, orgId); } [color=red]此处get,load效果一样,都报错。[/color] [color=red]OrgManagerImpl Spring bean 配置文件 applicationContext-beans.xml[/color] <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"> <bean id="OrgManager" class="com.ddy.oa.manager.impl.OrgManagerImpl" > <property name="sessionFactory" ref="sessionFactory"/> </bean> </beans> [color=red]spring 事务处理 xml文件 : applicationContext-common.xml[/color] <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"> <!-- 配置SessionFactory --> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="configLocation"> <value>classpath:hibernate.cfg.xml</value> </property> </bean> <!-- 配置事务管理器 --> <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory"> <ref bean="sessionFactory"/> </property> </bean> <!-- 事务的传播特性 --> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="add*" propagation="REQUIRED"/> <tx:method name="del*" propagation="REQUIRED" /> <tx:method name="update*" propagation="REQUIRED"/> <tx:method name="find*" propagation="REQUIRED"/> <tx:method name="*" read-only="true"/> </tx:attributes> </tx:advice> <!-- 那些类那些方法使用事务 --> <aop:config> <aop:pointcut id="allManagerMethod" expression="execution(* com.ddy.oa.manager.*.*(..))"/> <aop:advisor advice-ref="txAdvice" pointcut-ref="allManagerMethod"/> </aop:config> </beans> [color=red]采用 JUnit测试类 代码[/color] public void testFindOrg() { OrgManager orgImpl = (OrgManager)factory.getBean("OrgManager"); Organization org = (Organization)orgImpl.findOrg(2); System.out.println(org.getSn() + "--> parent " + org.getParent().getDescription()); } [color=red]报错信息:[/color] 10:48:06,531 WARN ConfigurationFactory:127 - No configuration found. Configuring ehcache from ehcache-failsafe.xml found in the classpath: jar:file:/F:/Eclipse3.3/OA/myOa/WebRoot/WEB-INF/lib/ehcache-1.2.jar!/ehcache-failsafe.xml 10:48:08,421 ERROR LazyInitializationException:19 - could not initialize proxy - the owning Session was closed org.hibernate.LazyInitializationException: could not initialize proxy - the owning Session was closed at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:60) at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:111) at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:160) at com.ddy.oa.model.Organization$$EnhancerByCGLIB$$16ae7ba.getSn(<generated>) at com.ddy.oa.manager.impl.OrgManagerImplTest.testFindOrg(OrgManagerImplTest.java:61) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at junit.framework.TestCase.runTest(TestCase.java:154) at junit.framework.TestCase.runBare(TestCase.java:127) at junit.framework.TestResult$1.protect(TestResult.java:106) at junit.framework.TestResult.runProtected(TestResult.java:124) at junit.framework.TestResult.run(TestResult.java:109) at junit.framework.TestCase.run(TestCase.java:118) at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196) 已经想了好几天,还是不能够解决问题,向大家请教。先谢啦。 [b]问题补充:[/b] 先感谢 dmewy 的回答。 OrgManagerImpl 是一个Manager类,我用它的findOrg方法来为业务逻辑来提供 Organization 的查找。不可能把业务逻辑也写倒方法里的。 就是根据id 来查找 倒具体的Organization 类返回啊。 [color=red]或者可以考虑open session in view 模式也可以解决。 [/color] 可以请教一下 open session in view 模式 具体怎么设置嘛?
ssm项目的问题 Servlet.init() for servlet [spring-dispatcher] threw exception
跟着网上的ssm项目做,可以说代码基本都是照着敲的。但是还是会有各种各样的bug。这个问题困扰我两天了,网上常见的我都试过,包括spring和jdk版本的适配,jar包的调整等等。请各位大佬帮忙看一下,感激不尽!下面是我警告和错误的代码: ``` WARN org.springframework.web.context.support.XmlWebApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in file [D:\Program Files\Apache Software Foundation\Tomcat 9.0\webapps\o2o\WEB-INF\classes\spring\spring-dao.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\Program Files\Apache Software Foundation\Tomcat 9.0\webapps\o2o\WEB-INF\classes\mapper\AreaDao.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\Program Files\Apache Software Foundation\Tomcat 9.0\webapps\o2o\WEB-INF\classes\mapper\AreaDao.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.immoc.o2o.entity.Area'. Cause: java.lang.ClassNotFoundException: Cannot find class: com.immoc.o2o.entity.Area 19:32:17.316 [http-nio-8080-exec-3] ERRORorg.springframework.web.servlet.DispatcherServlet - Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in file [D:\Program Files\Apache Software Foundation\Tomcat 9.0\webapps\o2o\WEB-INF\classes\spring\spring-dao.xml]: Invocation of init method failed; ``` 下面是错误中提到的AreaDao.xml: ``` <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.immoc.o2o.dao.AreaDao"> <select id="queryArea" resultType="com.immoc.o2o.entity.Area"> SELECT area_id,area_name,priority,create_time,last_edit_time FROM tb_area ORDER BY priority DESC </select> </mapper> ``` Controller: ``` package com.immoc.o2o.web.superadmin; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import com.immoc.o2o.entity.Area; import com.immoc.o2o.service.AreaService; @Controller @RequestMapping("/superadmin") public class AreaController { @Autowired private AreaService areaService ; @RequestMapping(value="/listarea",method=RequestMethod.GET)//涉及前端的全小写 //pose的传值是相对安全的,而get的传值会反馈到URL上面 @ResponseBody private Map <String,Object> listArea(){ Map <String,Object> modelMap= new HashMap<String,Object>();//map's key不能重复 List<Area> list=new ArrayList<Area>(); try { list=areaService.getAreaList(); modelMap.put("rows", list); modelMap.put("total", list.size()); }catch(Exception e) { e.printStackTrace(); modelMap.put("success", false); modelMap.put("errMsg", e.toString()); } return modelMap; } } ``` pom的配置,都是一些基本的配置,spring版本我用的都是最新的5.1.8 ``` <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.immoc</groupId> <artifactId>o2o</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>o2o Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <!-- maven-dependency-plugin是来自csdn的博客 --> <!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-dependency-plugin --> <dependency> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <version>3.1.1</version> </dependency> <!-- 原作是junit,这里已经升级 --> <!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api --> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-api</artifactId> <version>5.5.1</version> <scope>test</scope> </dependency> <!-- https://mvnrepository.com/artifact/ch.qos.logback/logback-classic --> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> <version>1.2.3</version> </dependency> <!-- 这里用的都是5.1.8,而在原作里是设置了spring version的 --> <!-- https://mvnrepository.com/artifact/org.springframework/spring-core --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>5.1.8.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans这个其实就是备注 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>5.1.8.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-context --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.1.8.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.1.8.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>5.1.8.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-web --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>5.1.8.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc 核心--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.1.8.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-test --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>5.1.8.RELEASE</version> <scope>test</scope> </dependency> <!-- 除了spring之外还用到其他的架包,比如servlet --> <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>4.0.1</version> <scope>provided</scope> </dependency> <!-- 根据csdn加的jackson-core --> <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.9.9</version> </dependency> <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.9</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-collections4 --> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-collections4</artifactId> <!-- commons collection has been moved to commons collections4 --> <version>4.1</version> </dependency> <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.2</version> </dependency> <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.2</version> </dependency> <!-- 下面适合数据库配合的架包 --> <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.17</version> </dependency> <!-- 连接池 --> <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 --> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.4</version> </dependency> </dependencies> <build> <finalName>o2o</finalName> <plugins> <plugin> <!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-compiler-plugin --> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.1</version> <configuration> <source>1.8</source> <target>1.8</target> <encoding>UTF8</encoding> </configuration> </plugin> </plugins> </build> </project> ``` 下面加个springDao吧: ``` <?xml version="1.0" encoding="UTF-8"?> <!-- 引入schema约束 --> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation= "http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd "> <!-- mvc是新加入的 --> <!-- 加载jdbc.properties配置文件--> <context:property-placeholder location="classpath:jdbc.properties"/> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driver}"></property> <property name="jdbcUrl" value="${jdbc.url}"></property> <property name="user" value="${jdbc.username}"></property> <property name="password" value="${jdbc.password}"></property> <!-- c3p0的私有属性 --> <property name="maxPoolSize" value="30"/> <property name="minPoolSize" value="10"/> <!-- 关闭连接后不自动commit --> <property name="autoCommitOnClose" value="false"/> <!-- 获取超时链接的时间--> <property name="checkoutTimeout" value="10000"/> <!-- 连接失败的重试次数 --> <property name="acquireRetryAttempts" value="2"/> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="configLocation" value="classpath:mybatis-config.xml" /> <property name="typeAliasesPackage" value="com.immoc.entity" /> <!-- 上面一行中原代码没有o2o --> <property name="mapperLocations" value="classpath:mapper/*.xml" /> </bean> <!-- 配置dao接口包,动态实现dao接口 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> <property name="basePackage" value="com.immoc.o2o.dao" /> <!-- 上面一行中原代码没有o2o,后来又加上了 --> </bean> </beans> ``` 顺便说一下,debug真的好难呀,随便一下一天就过去了
mybatisplus自动生成的代码为什么导入的包路径错误?
## 第一次使用Mybatis-plus,在做完配置之后,点击mp:code,生成的代码如下: 很多文件中都是包的路径错误,这是什么情况啊,。。。。应该怎么解决呢??? 这里是包的路径import com.baomidou.mybatisplus.annotation.TableId; 生成的是import com.baomidou.mybatisplus.annotations.TableId; ![图片说明](https://img-ask.csdn.net/upload/201811/30/1543546984_436119.png) 这里路径应该为import com.baomidou.mybatisplus.extension.service.IService; 结果生成了import com.baomidou.framework.service.IService; ![图片说明](https://img-ask.csdn.net/upload/201811/30/1543547119_100572.png) 配置文件如下: pom.xml ``` <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.wuyunfeng</groupId> <artifactId>TestPlus</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <name>TestPlus Maven Webapp</name> <url>http://www.wuyunfeng.com</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <maven.compiler.source>1.7</maven.compiler.source> <maven.compiler.target>1.7</maven.compiler.target> <!-- spring版本号 --> <spring.version>4.3.5.RELEASE</spring.version> <!-- mybatis版本号 --> <mybatis.version>3.4.1</mybatis.version> <!-- log4j日志文件管理包版本 --> <slf4j.version>1.7.12</slf4j.version> <log4j.version>1.2.17</log4j.version> </properties> <dependencies> <!-- 单元测试 --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <!-- 表示开发的时候引入,发布的时候不会加载此包 --> <scope>test</scope> </dependency> <!-- java ee包 --> <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId> <version>7.0</version> </dependency> <!-- 导入mybatis-plus包 start --> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus</artifactId> <version>3.0.6</version> </dependency> <dependency> <groupId>org.apache.velocity</groupId> <artifactId>velocity</artifactId> <version>1.7</version> </dependency> <!-- 导入mybatis-plus包 end --> <!-- 数据库驱动 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.41</version> </dependency> <!-- 导入dbcp的jar包,用来在applicationContext.xml中配置数据库 --> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> <!-- jstl标签类 --> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> <!-- log start --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>${slf4j.version}</version> </dependency> <!-- log END --> <!-- 格式化对象,方便输出日志 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.6</version> </dependency> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> <version>1.9.13</version> </dependency> <!-- 上传组件包 start --> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.10</version> </dependency> <!-- 上传组件包 end --> <!-- AL相关添加 --> <dependency> <groupId>net.sourceforge.jexcelapi</groupId> <artifactId>jxl</artifactId> <version>2.6</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.8</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.9</version> </dependency> <!-- AL相关添加 --> <!-- https://mvnrepository.com/artifact/net.sourceforge.javacsv/javacsv --> <dependency> <groupId>net.sourceforge.javacsv</groupId> <artifactId>javacsv</artifactId> <version>2.0</version> </dependency> <!-- spring框架包 start --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-oxm</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${spring.version}</version> </dependency> <!-- spring框架包 end --> <!-- spring 新添加的可选包 项目中未用到--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>${spring.version}</version> </dependency> </dependencies> <build> <finalName>TestPlus</finalName> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>2.3.2</version> <configuration> <source>1.6</source> <target>1.6</target> </configuration> </plugin> <plugin> <groupId>com.baomidou</groupId> <artifactId>mybatisplus-maven-plugin</artifactId> <version>1.0</version> <configuration> <!-- 输出目录(默认java.io.tmpdir) --> <outputDir>/run/media/ry03/wuyunfeng/workspace/IDEA/TestPlus/src/main/java</outputDir> <!-- 是否覆盖同名文件(默认false) --> <fileOverride>true</fileOverride> <!-- mapper.xml 中添加二级缓存配置(默认true) --> <enableCache>false</enableCache> <!-- 开发者名称 --> <author>WuYunfeng</author> <!-- 是否开启 ActiveRecord 模式(默认true) --> <activeRecord>false</activeRecord> <!-- 数据源配置,( **必配** ) --> <dataSource> <driverName>com.mysql.jdbc.Driver</driverName> <url>jdbc:mysql://127.0.0.1:3306/testssm?useUnicode=true&amp;useSSL=false&amp;characterEncoding=utf-8</url> <username>root</username> <password>123456</password> </dataSource> <strategy> <!-- 字段生成策略,四种类型,从名称就能看出来含义: nochange(默认), underline_to_camel,(下划线转驼峰) remove_prefix,(去除第一个下划线的前部分,后面保持不变) remove_prefix_and_camel(去除第一个下划线的前部分,后面转驼峰) --> <naming>underline_to_camel</naming> <!-- 表前缀 --> <tablePrefix>bmd_</tablePrefix> <!--Entity中的ID生成策略(默认 id_worker)--> <idGenType>auto</idGenType> <!--自定义超类--> <!--<superServiceClass>com.baomidou.base.BaseService</superServiceClass>--> <!-- 要包含的表 与exclude 二选一配置--> <include> <property>user</property> <!--<property>message</property>--> </include> <!-- 要排除的表 --> <!--<exclude>--> <!--<property>schema_version</property>--> <!--</exclude>--> </strategy> <packageInfo> <!-- 父级包名称,如果不写,下面的service等就需要写全包名(默认com.baomidou) --> <parent>com.wuyunfeng</parent> <!-- service包名(默认service) --> <service>service</service> <!-- serviceImpl包名(默认service.impl) --> <serviceImpl>service.impl</serviceImpl> <!-- entity包名(默认entity) --> <entity>model</entity> <!-- mapper包名(默认mapper) --> <mapper>mapper</mapper> <!-- xml包名(默认mapper.xml) --> <xml>mapper.xml</xml> <!-- controller包名(默认controller) --> <controller>controller</controller> </packageInfo> </configuration> <dependencies> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.41</version> </dependency> </dependencies> </plugin> </plugins> </build> </project> ```
相见恨晚的超实用网站
搞学习 知乎:www.zhihu.com 简答题:http://www.jiandati.com/ 网易公开课:https://open.163.com/ted/ 网易云课堂:https://study.163.com/ 中国大学MOOC:www.icourse163.org 网易云课堂:study.163.com 哔哩哔哩弹幕网:www.bilibili.com 我要自学网:www.51zxw
花了20分钟,给女朋友们写了一个web版群聊程序
参考博客 [1]https://www.byteslounge.com/tutorials/java-ee-html5-websocket-example
爬虫福利二 之 妹子图网MM批量下载
爬虫福利一:27报网MM批量下载    点击 看了本文,相信大家对爬虫一定会产生强烈的兴趣,激励自己去学习爬虫,在这里提前祝:大家学有所成! 目标网站:妹子图网 环境:Python3.x 相关第三方模块:requests、beautifulsoup4 Re:各位在测试时只需要将代码里的变量 path 指定为你当前系统要保存的路径,使用 python xxx.py 或IDE运行即可。
字节跳动视频编解码面经
引言 本文主要是记录一下面试字节跳动的经历。 三四月份投了字节跳动的实习(图形图像岗位),然后hr打电话过来问了一下会不会opengl,c++,shador,当时只会一点c++,其他两个都不会,也就直接被拒了。 七月初内推了字节跳动的提前批,因为内推没有具体的岗位,hr又打电话问要不要考虑一下图形图像岗,我说实习投过这个岗位不合适,不会opengl和shador,然后hr就说秋招更看重基础。我当时
开源一个功能完整的SpringBoot项目框架
福利来了,给大家带来一个福利。 最近想了解一下有关Spring Boot的开源项目,看了很多开源的框架,大多是一些demo或者是一个未成形的项目,基本功能都不完整,尤其是用户权限和菜单方面几乎没有完整的。 想到我之前做的框架,里面通用模块有:用户模块,权限模块,菜单模块,功能模块也齐全了,每一个功能都是完整的。 打算把这个框架分享出来,供大家使用和学习。 为什么用框架? 框架可以学习整体
Java学习的正确打开方式
在博主认为,对于入门级学习java的最佳学习方法莫过于视频+博客+书籍+总结,前三者博主将淋漓尽致地挥毫于这篇博客文章中,至于总结在于个人,实际上越到后面你会发现学习的最好方式就是阅读参考官方文档其次就是国内的书籍,博客次之,这又是一个层次了,这里暂时不提后面再谈。博主将为各位入门java保驾护航,各位只管冲鸭!!!上天是公平的,只要不辜负时间,时间自然不会辜负你。 何谓学习?博主所理解的学习,它
程序员必须掌握的核心算法有哪些?
由于我之前一直强调数据结构以及算法学习的重要性,所以就有一些读者经常问我,数据结构与算法应该要学习到哪个程度呢?,说实话,这个问题我不知道要怎么回答你,主要取决于你想学习到哪些程度,不过针对这个问题,我稍微总结一下我学过的算法知识点,以及我觉得值得学习的算法。这些算法与数据结构的学习大多数是零散的,并没有一本把他们全部覆盖的书籍。下面是我觉得值得学习的一些算法以及数据结构,当然,我也会整理一些看过
Python——画一棵漂亮的樱花树(不同种樱花+玫瑰+圣诞树喔)
最近翻到一篇知乎,上面有不少用Python(大多是turtle库)绘制的树图,感觉很漂亮,我整理了一下,挑了一些我觉得不错的代码分享给大家(这些我都测试过,确实可以生成喔~) one 樱花树 动态生成樱花 效果图(这个是动态的): 实现代码 import turtle as T import random import time # 画樱花的躯干(60,t) def Tree(branch
深深的码丨Java HashMap 透析
HashMap 相关概念 HashTab、HashMap、TreeMap 均以键值对像是存储或操作数据元素。HashTab继承自Dictionary,HashMap、TreeMap继承自AbstractMap,三者均实现Map接口 **HashTab:**同步哈希表,不支持null键或值,因为同步导致性能影响,很少被使用 **HashMap:**应用较多的非同步哈希表,支持null键或值,是键值对...
大学四年自学走来,这些私藏的实用工具/学习网站我贡献出来了
大学四年,看课本是不可能一直看课本的了,对于学习,特别是自学,善于搜索网上的一些资源来辅助,还是非常有必要的,下面我就把这几年私藏的各种资源,网站贡献出来给你们。主要有:电子书搜索、实用工具、在线视频学习网站、非视频学习网站、软件下载、面试/求职必备网站。 注意:文中提到的所有资源,文末我都给你整理好了,你们只管拿去,如果觉得不错,转发、分享就是最大的支持了。 一、电子书搜索 对于大部分程序员...
linux系列之常用运维命令整理笔录
本博客记录工作中需要的linux运维命令,大学时候开始接触linux,会一些基本操作,可是都没有整理起来,加上是做开发,不做运维,有些命令忘记了,所以现在整理成博客,当然vi,文件操作等就不介绍了,慢慢积累一些其它拓展的命令,博客不定时更新 顺便拉下票,我在参加csdn博客之星竞选,欢迎投票支持,每个QQ或者微信每天都可以投5票,扫二维码即可,http://m234140.nofollow.ax.
Python 基础(一):入门必备知识
目录1 标识符2 关键字3 引号4 编码5 输入输出6 缩进7 多行8 注释9 数据类型10 运算符10.1 常用运算符10.2 运算符优先级 1 标识符 标识符是编程时使用的名字,用于给变量、函数、语句块等命名,Python 中标识符由字母、数字、下划线组成,不能以数字开头,区分大小写。 以下划线开头的标识符有特殊含义,单下划线开头的标识符,如:_xxx ,表示不能直接访问的类属性,需通过类提供
程序员接私活怎样防止做完了不给钱?
首先跟大家说明一点,我们做 IT 类的外包开发,是非标品开发,所以很有可能在开发过程中会有这样那样的需求修改,而这种需求修改很容易造成扯皮,进而影响到费用支付,甚至出现做完了项目收不到钱的情况。 那么,怎么保证自己的薪酬安全呢? 我们在开工前,一定要做好一些证据方面的准备(也就是“讨薪”的理论依据),这其中最重要的就是需求文档和验收标准。一定要让需求方提供这两个文档资料作为开发的基础。之后开发
网页实现一个简单的音乐播放器(大佬别看。(⊙﹏⊙))
今天闲着无事,就想写点东西。然后听了下歌,就打算写个播放器。 于是乎用h5 audio的加上js简单的播放器完工了。 欢迎 改进 留言。 演示地点跳到演示地点 html代码如下`&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;music&lt;/title&gt; &lt;meta charset="utf-8"&gt
Python十大装B语法
Python 是一种代表简单思想的语言,其语法相对简单,很容易上手。不过,如果就此小视 Python 语法的精妙和深邃,那就大错特错了。本文精心筛选了最能展现 Python 语法之精妙的十个知识点,并附上详细的实例代码。如能在实战中融会贯通、灵活使用,必将使代码更为精炼、高效,同时也会极大提升代码B格,使之看上去更老练,读起来更优雅。 1. for - else 什么?不是 if 和 else 才
数据库优化 - SQL优化
前面一篇文章从实例的角度进行数据库优化,通过配置一些参数让数据库性能达到最优。但是一些“不好”的SQL也会导致数据库查询变慢,影响业务流程。本文从SQL角度进行数据库优化,提升SQL运行效率。 判断问题SQL 判断SQL是否有问题时可以通过两个表象进行判断: 系统级别表象 CPU消耗严重 IO等待严重 页面响应时间过长
2019年11月中国大陆编程语言排行榜
2019年11月2日,我统计了某招聘网站,获得有效程序员招聘数据9万条。针对招聘信息,提取编程语言关键字,并统计如下: 编程语言比例 rank pl_ percentage 1 java 33.62% 2 c/c++ 16.42% 3 c_sharp 12.82% 4 javascript 12.31% 5 python 7.93% 6 go 7.25% 7
通俗易懂地给女朋友讲:线程池的内部原理
餐厅的约会 餐盘在灯光的照耀下格外晶莹洁白,女朋友拿起红酒杯轻轻地抿了一小口,对我说:“经常听你说线程池,到底线程池到底是个什么原理?”我楞了一下,心里想女朋友今天是怎么了,怎么突然问出这么专业的问题,但做为一个专业人士在女朋友面前也不能露怯啊,想了一下便说:“我先给你讲讲我前同事老王的故事吧!” 大龄程序员老王 老王是一个已经北漂十多年的程序员,岁数大了,加班加不动了,升迁也无望,于是拿着手里
经典算法(5)杨辉三角
杨辉三角 是经典算法,这篇博客对它的算法思想进行了讲解,并有完整的代码实现。
腾讯算法面试题:64匹马8个跑道需要多少轮才能选出最快的四匹?
昨天,有网友私信我,说去阿里面试,彻底的被打击到了。问了为什么网上大量使用ThreadLocal的源码都会加上private static?他被难住了,因为他从来都没有考虑过这个问题。无独有偶,今天笔者又发现有网友吐槽了一道腾讯的面试题,我们一起来看看。 腾讯算法面试题:64匹马8个跑道需要多少轮才能选出最快的四匹? 在互联网职场论坛,一名程序员发帖求助到。二面腾讯,其中一个算法题:64匹
面试官:你连RESTful都不知道我怎么敢要你?
面试官:了解RESTful吗? 我:听说过。 面试官:那什么是RESTful? 我:就是用起来很规范,挺好的 面试官:是RESTful挺好的,还是自我感觉挺好的 我:都挺好的。 面试官:… 把门关上。 我:… 要干嘛?先关上再说。 面试官:我说出去把门关上。 我:what ?,夺门而去 文章目录01 前言02 RESTful的来源03 RESTful6大原则1. C-S架构2. 无状态3.统一的接
JDK12 Collectors.teeing 你真的需要了解一下
前言 在 Java 12 里面有个非常好用但在官方 JEP 没有公布的功能,因为它只是 Collector 中的一个小改动,它的作用是 merge 两个 collector 的结果,这句话显得很抽象,老规矩,我们先来看个图(这真是一个不和谐的图????): 管道改造经常会用这个小东西,通常我们叫它「三通」,它的主要作用就是将 downstream1 和 downstre...
为啥国人偏爱Mybatis,而老外喜欢Hibernate/JPA呢?
关于SQL和ORM的争论,永远都不会终止,我也一直在思考这个问题。昨天又跟群里的小伙伴进行了一番讨论,感触还是有一些,于是就有了今天这篇文。 声明:本文不会下关于Mybatis和JPA两个持久层框架哪个更好这样的结论。只是摆事实,讲道理,所以,请各位看官勿喷。 一、事件起因 关于Mybatis和JPA孰优孰劣的问题,争论已经很多年了。一直也没有结论,毕竟每个人的喜好和习惯是大不相同的。我也看
项目中的if else太多了,该怎么重构?
介绍 最近跟着公司的大佬开发了一款IM系统,类似QQ和微信哈,就是聊天软件。我们有一部分业务逻辑是这样的 if (msgType = "文本") { // dosomething } else if(msgType = "图片") { // doshomething } else if(msgType = "视频") { // doshomething } else { // doshom...
致 Python 初学者
欢迎来到“Python进阶”专栏!来到这里的每一位同学,应该大致上学习了很多 Python 的基础知识,正在努力成长的过程中。在此期间,一定遇到了很多的困惑,对未来的学习方向感到迷茫。我非常理解你们所面临的处境。我从2007年开始接触 python 这门编程语言,从2009年开始单一使用 python 应对所有的开发工作,直至今天。回顾自己的学习过程,也曾经遇到过无数的困难,也曾经迷茫过、困惑过。开办这个专栏,正是为了帮助像我当年一样困惑的 Python 初学者走出困境、快速成长。希望我的经验能真正帮到你
“狗屁不通文章生成器”登顶GitHub热榜,分分钟写出万字形式主义大作
一、垃圾文字生成器介绍 最近在浏览GitHub的时候,发现了这样一个骨骼清奇的雷人项目,而且热度还特别高。 项目中文名:狗屁不通文章生成器 项目英文名:BullshitGenerator 根据作者的介绍,他是偶尔需要一些中文文字用于GUI开发时测试文本渲染,因此开发了这个废话生成器。但由于生成的废话实在是太过富于哲理,所以最近已经被小伙伴们给玩坏了。 他的文风可能是这样的: 你发现,...
程序员:我终于知道post和get的区别
是一个老生常谈的话题,然而随着不断的学习,对于以前的认识有很多误区,所以还是需要不断地总结的,学而时习之,不亦说乎
《程序人生》系列-这个程序员只用了20行代码就拿了冠军
你知道的越多,你不知道的越多 点赞再看,养成习惯GitHub上已经开源https://github.com/JavaFamily,有一线大厂面试点脑图,欢迎Star和完善 前言 这一期不算《吊打面试官》系列的,所有没前言我直接开始。 絮叨 本来应该是没有这期的,看过我上期的小伙伴应该是知道的嘛,双十一比较忙嘛,要值班又要去帮忙拍摄年会的视频素材,还得搞个程序员一天的Vlog,还要写BU...
加快推动区块链技术和产业创新发展,2019可信区块链峰会在京召开
11月8日,由中国信息通信研究院、中国通信标准化协会、中国互联网协会、可信区块链推进计划联合主办,科技行者协办的2019可信区块链峰会将在北京悠唐皇冠假日酒店开幕。   区块链技术被认为是继蒸汽机、电力、互联网之后,下一代颠覆性的核心技术。如果说蒸汽机释放了人类的生产力,电力解决了人类基本的生活需求,互联网彻底改变了信息传递的方式,区块链作为构造信任的技术有重要的价值。   1...
程序员把地府后台管理系统做出来了,还有3.0版本!12月7号最新消息:已在开发中有github地址
第一幕:缘起 听说阎王爷要做个生死簿后台管理系统,我们派去了一个程序员…… 996程序员做的梦: 第一场:团队招募 为了应对地府管理危机,阎王打算找“人”开发一套地府后台管理系统,于是就在地府总经办群中发了项目需求。 话说还是中国电信的信号好,地府都是满格,哈哈!!! 经常会有外行朋友问:看某网站做的不错,功能也简单,你帮忙做一下? 而这次,面对这样的需求,这个程序员...
网易云6亿用户音乐推荐算法
网易云音乐是音乐爱好者的集聚地,云音乐推荐系统致力于通过 AI 算法的落地,实现用户千人千面的个性化推荐,为用户带来不一样的听歌体验。 本次分享重点介绍 AI 算法在音乐推荐中的应用实践,以及在算法落地过程中遇到的挑战和解决方案。 将从如下两个部分展开: AI算法在音乐推荐中的应用 音乐场景下的 AI 思考 从 2013 年 4 月正式上线至今,网易云音乐平台持续提供着:乐屏社区、UGC...
8年经验面试官详解 Java 面试秘诀
作者 |胡书敏 责编 | 刘静 出品 | CSDN(ID:CSDNnews) 本人目前在一家知名外企担任架构师,而且最近八年来,在多家外企和互联网公司担任Java技术面试官,前后累计面试了有两三百位候选人。在本文里,就将结合本人的面试经验,针对Java初学者、Java初级开发和Java开发,给出若干准备简历和准备面试的建议。 Java程序员准备和投递简历的实...
面试官如何考察你的思维方式?
1.两种思维方式在求职面试中,经常会考察这种问题:北京有多少量特斯拉汽车?某胡同口的煎饼摊一年能卖出多少个煎饼?深圳有多少个产品经理?一辆公交车里能装下多少个乒乓球?一个正常成年人有多少根头发?这类估算问题,被称为费米问题,是以科学家费米命名的。为什么面试会问这种问题呢?这类问题能把两类人清楚地区分出来。一类是具有文科思维的人,擅长赞叹和模糊想象,它主要依靠的是人的第一反应和直觉,比如小孩...
碎片化的时代,如何学习
今天周末,和大家聊聊学习这件事情。 在如今这个社会,我们的时间被各类 APP 撕的粉碎。 刷知乎、刷微博、刷朋友圈; 看论坛、看博客、看公号; 等等形形色色的信息和知识获取方式一个都不错过。 貌似学了很多,但是却感觉没什么用。 要解决上面这些问题,首先要分清楚一点,什么是信息,什么是知识。 那什么是信息呢? 你一切听到的、看到的,都是信息,比如微博上的明星出轨、微信中的表情大战、抖音上的...
so easy! 10行代码写个"狗屁不通"文章生成器
前几天,GitHub 有个开源项目特别火,只要输入标题就可以生成一篇长长的文章。 背后实现代码一定很复杂吧,里面一定有很多高深莫测的机器学习等复杂算法 不过,当我看了源代码之后 这程序不到50行 尽管我有多年的Python经验,但我竟然一时也没有看懂 当然啦,原作者也说了,这个代码也是在无聊中诞生的,平时撸码是不写中文变量名的, 中文...
知乎高赞:中国有什么拿得出手的开源软件产品?(整理自本人原创回答)
知乎高赞:中国有什么拿得出手的开源软件产品? 在知乎上,有个问题问“中国有什么拿得出手的开源软件产品(在 GitHub 等社区受欢迎度较好的)?” 事实上,还不少呢~ 本人于2019.7.6进行了较为全面的回答,对这些受欢迎的 Github 开源项目分类整理如下: 分布式计算、云平台相关工具类 1.SkyWalking,作者吴晟、刘浩杨 等等 仓库地址: apache/skywalking 更...
相关热词 c#处理浮点数 c# 生成字母数字随机数 c# 动态曲线 控件 c# oracle 开发 c#选择字体大小的控件 c# usb 批量传输 c#10进制转8进制 c#转base64 c# 科学计算 c#下拉列表获取串口
立即提问