调试一个开源项目出现报错,项目所有sql都会报空指针异常
严重: Servlet.service() for servlet [springMvc] in context with path [/mallapp] threw exception [Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.lang.NullPointerException
### The error may exist in file [H:\WorksSpace\.metadata\.plugins\org.eclipse.wst.server.core\tmp2\wtpwebapps\mallapp\WEB-INF\classes\mybatis\category\CategoryMapper.xml]
### The error may involve CategoryMapper.listAll-Inline
### The error occurred while setting parameters
### SQL: select category_name, category_img, sort, category_id, super_id from shop_category where super_id =? order by sort
### Cause: java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at org.apache.ibatis.type.BaseTypeHandler.setParameter(BaseTypeHandler.java:43)
at org.apache.ibatis.scripting.defaults.DefaultParameterHandler.setParameters(DefaultParameterHandler.java:81)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.parameterize(PreparedStatementHandler.java:80)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.parameterize(RoutingStatementHandler.java:61)
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:606)
at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:62)
at com.sun.proxy.$Proxy84.parameterize(Unknown Source)
at org.apache.ibatis.executor.ReuseExecutor.prepareStatement(ReuseExecutor.java:79)
at org.apache.ibatis.executor.ReuseExecutor.doQuery(ReuseExecutor.java:56)
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:77)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358)
at com.sun.proxy.$Proxy74.selectList(Unknown Source)
at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:198)
at com.yq.dao.DaoSupport.findForList(DaoSupport.java:118)
at com.yq.service.category.impl.CategoryService.listAll(CategoryService.java:62)
at com.yq.service.category.impl.CategoryService$$FastClassBySpringCGLIB$$51d95cd7.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:711)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:644)
at com.yq.service.category.impl.CategoryService$$EnhancerBySpringCGLIB$$c2253a36.listAll(<generated>)
at com.yq.controller.category.CategoryController.list(CategoryController.java:80)
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:606)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:690)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
CategoryMapper.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="CategoryMapper">
<!--表名 -->
<sql id="tableName">
shop_category
</sql>
<!-- 字段 -->
<sql id="Field">
category_name,
category_img,
sort,
category_id,
super_id
</sql>
<!-- 字段值 -->
<sql id="FieldValue">
#{category_name},
#{category_img},
#{sort},
#{category_id},
#{super_id}
</sql>
<!-- 新增-->
<insert id="save" parameterType="pd">
insert into
<include refid="tableName"></include>
(
<include refid="Field"></include>
) values (
<include refid="FieldValue"></include>
)
</insert>
<!-- 删除-->
<delete id="delete" parameterType="pd">
delete from
<include refid="tableName"></include>
where
category_id = #{category_id}
</delete>
<!-- 修改 -->
<update id="edit" parameterType="pd">
update
<include refid="tableName"></include>
set
category_name = #{category_name},
category_img = #{category_img},
sort = #{sort}
where
category_id = #{category_id}
</update>
<!-- 通过ID获取数据 -->
<select id="findById" parameterType="pd" resultType="pd">
select
<include refid="Field"></include>
from
<include refid="tableName"></include>
where
category_id = #{category_id}
</select>
<!-- 列表 -->
<select id="datalistPage" parameterType="page" resultType="pd">
select
<include refid="Field"></include>
from
<include refid="tableName"></include>
where 1=1
and
super_id =#{pd.super_id}
order by sort
</select>
<!-- 列表(全部) -->
<select id="listAll" parameterType="pd" resultType="pd">
select
<include refid="Field"></include>
from
<include refid="tableName"></include>
where
super_id =#{super_id}
order by sort
</select>
<!-- 批量删除 -->
<delete id="deleteAll" parameterType="String">
delete from
<include refid="tableName"></include>
where
category_id in
<foreach item="item" index="index" collection="array" open="(" separator="," close=")">
#{item}
</foreach>
</delete>
</mapper>
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD SQL Map Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<setting name="cacheEnabled" value="true" /><!-- 全局映射器启用缓存 -->
<setting name="useGeneratedKeys" value="true" />
<setting name="defaultExecutorType" value="REUSE" />
<!-- 打印查询语句 -->
<setting name="logImpl" value="LOG4J" />
</settings>
<typeAliases>
<typeAlias type="org.change.entity.system.User" alias="User"/>
<typeAlias type="org.change.entity.system.Role" alias="Role"/>
<typeAlias type="org.change.entity.system.Menu" alias="Menu"/>
<typeAlias type="org.change.entity.system.Dictionaries" alias="Dictionaries"/>
<typeAlias type="org.change.entity.system.Department" alias="Department"/>
<typeAlias type="org.change.util.PageData" alias="pd"/>
<!-- 分页 -->
<typeAlias type="org.change.entity.Page" alias="Page"/>
</typeAliases>
<plugins>
<plugin interceptor="org.change.plugin.PagePlugin">
<property name="dialect" value="mysql"/>
<property name="pageSqlId" value=".*listPage.*"/>
</plugin>
</plugins>
</configuration>
DAO.java
public interface DAO {
/**
* 保存对象
* @param str
* @param obj
* @return
* @throws Exception
*/
public Object save(String str, Object obj) throws Exception;
/**
* 修改对象
* @param str
* @param obj
* @return
* @throws Exception
*/
public Object update(String str, Object obj) throws Exception;
/**
* 删除对象
* @param str
* @param obj
* @return
* @throws Exception
*/
public Object delete(String str, Object obj) throws Exception;
/**
* 查找对象
* @param str
* @param obj
* @return
* @throws Exception
*/
public Object findForObject(String str, Object obj) throws Exception;
/**
* 查找对象
* @param str
* @param obj
* @return
* @throws Exception
*/
public Object findForList(String str, Object obj) throws Exception;
/**
* 查找对象封装成Map
* @param s
* @param obj
* @return
* @throws Exception
*/
public Object findForMap(String sql, Object obj, String key , String value) throws Exception;
}
DaoSupport.java
@Repository("daoSupport")
public class DaoSupport implements DAO {
@Resource(name = "sqlSessionTemplate")
private SqlSessionTemplate sqlSessionTemplate;
/**
* 保存对象
* @param str
* @param obj
* @return
* @throws Exception
*/
public Object save(String str, Object obj) throws Exception {
return sqlSessionTemplate.insert(str, obj);
}
/**
* 批量更新
* @param str
* @param obj
* @return
* @throws Exception
*/
public Object batchSave(String str, List objs )throws Exception{
return sqlSessionTemplate.insert(str, objs);
}
/**
* 修改对象
* @param str
* @param obj
* @return
* @throws Exception
*/
public Object update(String str, Object obj) throws Exception {
return sqlSessionTemplate.update(str, obj);
}
/**
* 批量更新
* @param str
* @param obj
* @return
* @throws Exception
*/
public void batchUpdate(String str, List objs )throws Exception{
SqlSessionFactory sqlSessionFactory = sqlSessionTemplate.getSqlSessionFactory();
//批量执行器
SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH,false);
try{
if(objs!=null){
for(int i=0,size=objs.size();i<size;i++){
sqlSession.update(str, objs.get(i));
}
sqlSession.flushStatements();
sqlSession.commit();
sqlSession.clearCache();
}
}finally{
sqlSession.close();
}
}
/**
* 批量更新
* @param str
* @param obj
* @return
* @throws Exception
*/
public Object batchDelete(String str, List objs )throws Exception{
return sqlSessionTemplate.delete(str, objs);
}
/**
* 删除对象
* @param str
* @param obj
* @return
* @throws Exception
*/
public Object delete(String str, Object obj) throws Exception {
return sqlSessionTemplate.delete(str, obj);
}
/**
* 查找对象
* @param str
* @param obj
* @return
* @throws Exception
*/
public Object findForObject(String str, Object obj) throws Exception {
return sqlSessionTemplate.selectOne(str, obj);
}
/**
* 查找对象
* @param str
* @param obj
* @return
* @throws Exception
*/
public Object findForList(String str, Object obj) throws Exception {
return sqlSessionTemplate.selectList(str, obj);
}
public Object findForMap(String str, Object obj, String key, String value) throws Exception {
return sqlSessionTemplate.selectMap(str, obj, key);
}
}
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: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.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.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
">
<!-- 配置事务管理器 -->
<bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:jdbc.properties"/>
</bean>
<!-- 阿里 druid数据库连接池 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">
<!-- 数据库基本信息配置 -->
<property name="driverClassName" value="${driverClassName}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
<property name="filters" value="${filters}" />
<!-- 最大并发连接数 -->
<property name="maxActive" value="${maxActive}" />
<!-- 初始化连接数量 -->
<property name="initialSize" value="${initialSize}" />
<!-- 配置获取连接等待超时的时间 -->
<property name="maxWait" value="${maxWait}" />
<!-- 最小空闲连接数 -->
<property name="minIdle" value="${minIdle}" />
<!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 -->
<property name="timeBetweenEvictionRunsMillis" value="${timeBetweenEvictionRunsMillis}" />
<!-- 配置一个连接在池中最小生存的时间,单位是毫秒 -->
<property name="minEvictableIdleTimeMillis" value="${minEvictableIdleTimeMillis}" />
<property name="validationQuery" value="${validationQuery}" />
<property name="testWhileIdle" value="${testWhileIdle}" />
<property name="testOnBorrow" value="${testOnBorrow}" />
<property name="testOnReturn" value="${testOnReturn}" />
<property name="maxOpenPreparedStatements" value="${maxOpenPreparedStatements}" />
<!-- 打开removeAbandoned功能 -->
<property name="removeAbandoned" value="${removeAbandoned}" />
<!-- 1800秒,也就是30分钟 -->
<property name="removeAbandonedTimeout" value="${removeAbandonedTimeout}" />
<!-- 关闭abanded连接时输出错误日志 -->
<property name="logAbandoned" value="${logAbandoned}" />
</bean>
<!-- 启用注解 -->
<context:annotation-config />
<!-- 启动组件扫描,排除@Controller组件,该组件由SpringMVC配置文件扫描 -->
<context:component-scan base-package="com">
<context:exclude-filter type="annotation"
expression="org.springframework.stereotype.Controller" />
</context:component-scan>
<!-- 注解方式配置事务-->
<!-- <tx:annotation-driven transaction-manager="transactionManager" /> -->
<!-- 拦截器方式配置事务 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="delete*" propagation="REQUIRED" read-only="false"
rollback-for="java.lang.Exception"/>
<tx:method name="insert*" propagation="REQUIRED" read-only="false"
rollback-for="java.lang.Exception" />
<tx:method name="update*" propagation="REQUIRED" read-only="false"
rollback-for="java.lang.Exception" />
<tx:method name="save*" propagation="REQUIRED" read-only="false"
rollback-for="java.lang.Exception" />
<tx:method name="*" propagation="SUPPORTS"/>
</tx:attributes>
</tx:advice>
<aop:aspectj-autoproxy proxy-target-class="true"/>
<!-- 事物处理 -->
<aop:config>
<aop:pointcut id="pc" expression="execution(* com.*.service..*(..))" />
<aop:advisor pointcut-ref="pc" advice-ref="txAdvice" />
</aop:config>
<!-- 配置mybatis -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:mybatis-config.xml"></property>
<!-- mapper扫描 -->
<property name="mapperLocations" value="classpath:mybatis/*/*.xml"></property>
</bean>
<bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg ref="sqlSessionFactory" />
</bean>
</beans>