c3p0的jar包加载正常,报错说找不到ComboPooledDataSource

c3p0的jar包已经加载正常,为何还报错说找不到com.mchange.v2.c3p0.ComboPooledDataSource

而且在类中import时时可以找到这个类的。但是在spring+Hibernate配置数据源的时候,启动Tomcat就报错啊!!!
报错信息如下:
org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.mchange.v2.c3p0.ComboPooledDataSource] for bean with name 'datasource' defined in class path resource [applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: com.mchange.v2.c3p0.ComboPooledDataSource
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1327)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:594)
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1396)
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:959)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:683)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5099)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5615)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1260)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:2002)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: com.mchange.v2.c3p0.ComboPooledDataSource
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1891)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1734)
at org.springframework.util.ClassUtils.forName(ClassUtils.java:247)
at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:395)
at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1348)
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1319)
... 23 more
2017-2-8 16:37:32 org.apache.catalina.core.StandardContext listenerStart
严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.mchange.v2.c3p0.ComboPooledDataSource] for bean with name 'datasource' defined in class path resource [applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: com.mchange.v2.c3p0.ComboPooledDataSource
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1327)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:594)
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1396)
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:959)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:683)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5099)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5615)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1260)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:2002)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: com.mchange.v2.c3p0.ComboPooledDataSource
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1891)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1734)
at org.springframework.util.ClassUtils.forName(ClassUtils.java:247)
at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:395)
at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1348)
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1319)
... 23 more

最恐怖的是当我把那些c3p0的三个.jar包放到lib下面结果就成功了,但是我自己创建的一个库没用?![jar包位置](https://img-ask.csdn.net/upload/201702/08/1486543298_918271.png)
求解

3个回答

配置的问题, 运行环境下 容器找不到你的jar包, 可能是编译目录的问题。 具体原因 要看你的具体配置了

qq_34745752
qq_34745752 放在这里却不能编译到
3 年多之前 回复
 通常情况下,java web项目会自动将WEB-INF项目下的lib添加到类路径下的,tomcat发布的部署包时也是会从lib目录下加载的。
但是开发阶段是会出现Eclipse没有自动将lib下的jar添加到类路径下,这是需要手动build path添加到类路径下的。
具体原因不明,但是作为一种经验可以记录下,如果发布时找不到加载类,就手动把lib下jar添加到build path下面。可以肯定的是项目部署到tomcate里面是不会出现这种情况的,只是在Eclipse开发环境中会出现。
qq_34745752
qq_34745752 放在这里却不能编译到
3 年多之前 回复

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org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.startup.Catalina.start(Catalina.java:633) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at 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org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.lang.String' to required type 'java.lang.Class[]' for property 'typeAliases'; nested exception is java.lang.IllegalArgumentException: Could not find class [com.hopu.entity] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1272) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ... 45 more Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDao' defined in file [E:\Tomcat\apache-tomcat-9.0.22\wtpwebapps\ssm\WEB-INF\classes\com\hopu\dao\UserDao.class]: Cannot resolve reference to bean 'sqlSessionFactory' while setting bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [spring.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.lang.String' to required type 'java.lang.Class[]' for property 'typeAliases'; nested exception is java.lang.IllegalArgumentException: Could not find class [com.hopu.entity] at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:359) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1537) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1284) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ... 58 more Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [spring.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.lang.String' to required type 'java.lang.Class[]' for property 'typeAliases'; nested exception is java.lang.IllegalArgumentException: Could not find class [com.hopu.entity] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:351) ... 71 more Caused by: org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.lang.String' to required type 'java.lang.Class[]' for property 'typeAliases'; nested exception is java.lang.IllegalArgumentException: Could not find class [com.hopu.entity] at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:608) at org.springframework.beans.AbstractNestablePropertyAccessor.convertForProperty(AbstractNestablePropertyAccessor.java:615) at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:216) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1583) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1542) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1284) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ... 77 more Caused by: java.lang.IllegalArgumentException: Could not find class [com.hopu.entity] at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:288) at org.springframework.beans.propertyeditors.ClassArrayEditor.setAsText(ClassArrayEditor.java:68) at org.springframework.beans.TypeConverterDelegate.doConvertTextValue(TypeConverterDelegate.java:470) at org.springframework.beans.TypeConverterDelegate.doConvertValue(TypeConverterDelegate.java:443) at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:200) at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:588) ... 83 more Caused by: java.lang.ClassNotFoundException: com.hopu.entity at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1365) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1188) at org.springframework.util.ClassUtils.forName(ClassUtils.java:251) at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:285) ... 88 more ``` 网上的解决办法基本都试过了,无解,所以跪求各位大佬解答

请问有没有人知道c3p0连接池配置报错

请问有没有人知道,谢谢!!!log4j:WARN No appenders could be found for logger (com.mchange.v2.log.MLog). log4j:WARN Please initialize the log4j system properly.

使用c3p0连接ORACLE数据库查询不到数据,SQLPLUS执行相同SQL可以查到

搭建一个webservice 使用c3p0连接oracle数据库,在执行查询语句,查询同一条数据的时候,有的时候查询不到结果,而有的时候查询到结果,服务还不报错,在使用SQLPLUS执行该语句的时候每次都能查到结果,求大神帮忙推测一下是什么问题。 使用c3p0创建一个静态的ComboPooledDataSource对象,当需要的时候从这里获取连接 Connection conn = comb.getConnection(); 数据库是按照日期建的分区表,执行查询语句的时候没有按照分区表查询,这会不会有影响。

c3p0没有配置的必填项是否加载默认的值,会出错吗?

c3p0没有配置的必填项是否加载默认的值,会出错吗? 不包括数据库的参数. 比如一些maxsize,timeout之类的地方 不用c3p0会如何呢 我看有些jar 自带的

java web c3p0连接不上数据库

在学java web时候用c3p0连接数据库,数据库连接没问题,但是用xml方法的时候老是报错Connections could not be acquired from the underlying database! 是不是读取不到xml?还有题主的配置可能有问题,复制到lib文件夹的图片上传数据库的时候读取不到,必须加上绝对路径才能读取到,是不是和这个有关系?![图片说明](https://img-ask.csdn.net/upload/201607/11/1468198473_544205.png)

找不到窗口类别 com.mchange.v2.c3p0.ComboPooledDataSource

spring+hibernate tomcat启动时报错 c3p0jar包也导入了 不知道怎么解决了 求大神看看, tomcat启动时报错 。 但是又能正常运行的样子 ![图片说明](https://img-ask.csdn.net/upload/201705/23/1495521894_520507.png) ``` 14:29:54,196 ERROR ContextLoader:215 - Context initialization failed org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.mchange.v2.c3p0.ComboPooledDataSource] for bean with name 'dataSource' defined in ServletContext resource [/WEB-INF/classes/applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: com.mchange.v2.c3p0.ComboPooledDataSource at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1141) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:524) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1177) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:758) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:422) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380) at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4994) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5492) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649) at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1247) at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1897) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.ClassNotFoundException: com.mchange.v2.c3p0.ComboPooledDataSource at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571) at org.springframework.util.ClassUtils.forName(ClassUtils.java:211) at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:385) at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1138) ... 22 more 五月 23, 2017 2:29:54 下午 org.apache.catalina.core.StandardContext listenerStart 严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.mchange.v2.c3p0.ComboPooledDataSource] for bean with name 'dataSource' defined in ServletContext resource [/WEB-INF/classes/applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: com.mchange.v2.c3p0.ComboPooledDataSource at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1141) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:524) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1177) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:758) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:422) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380) at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4994) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5492) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649) at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1247) at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1897) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.ClassNotFoundException: com.mchange.v2.c3p0.ComboPooledDataSource at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571) at org.springframework.util.ClassUtils.forName(ClassUtils.java:211) at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:385) at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1138) ... 22 more ```

spring整合hibernate时,报错说找不到bean,求大神帮忙

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userDao': Unsatisfied dependency expressed through method 'setSessionFactory' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactoty' defined in class path resource [spring-hibernate.xml]: Invocation of init method failed; nested exception is org.hibernate.MappingException: invalid configuration at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:667) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) 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:761) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:93) at sy.test.TestHibernate.test(TestHibernate.java:21) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) 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.junit.runners.ParentRunner.run(ParentRunner.java:363) 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 'sessionFactoty' defined in class path resource [spring-hibernate.xml]: Invocation of init method failed; nested exception is org.hibernate.MappingException: invalid configuration at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:659) ... 38 more Caused by: org.hibernate.MappingException: invalid configuration at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2160) at org.hibernate.cfg.Configuration.configure(Configuration.java:2113) at org.springframework.orm.hibernate4.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:348) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) ... 48 more Caused by: org.xml.sax.SAXParseException; lineNumber: 2; columnNumber: 7; 文档无效: 找不到语法。 at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:396) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:284) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:229) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(XMLNSDocumentScannerImpl.java:614) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3135) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:880) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:118) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643) at org.dom4j.io.SAXReader.read(SAXReader.java:465) at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2157) ... 52 more

c3p0连接mysql,两web配置驱动一样,一个正常连接,另一个就报错,望大手解答一下个

如题目所说,2个web项目,配置文件完全一致,除了数据库名称更改了一下,但就是一个可以正常连接并读取,另一个不可以.![图片说明](https://img-ask.csdn.net/upload/201901/05/1546694612_788442.jpg),![图片说明](https://img-ask.csdn.net/upload/201901/05/1546694646_180453.jpg) 这两个是数据库的截图,都在本地下,一个web15,一个web17. 接下来是两个数据库的具体配置及jar版本![图片说明](https://img-ask.csdn.net/upload/201901/05/1546694752_134502.jpg)15![图片说明](https://img-ask.csdn.net/upload/201901/05/1546694756_64169.jpg)17, 15可以正常读取并显示页面,这里我为了省事直接输出一行了![图片说明](https://img-ask.csdn.net/upload/201901/05/1546694917_605779.jpg),控制台也正常,![图片说明](https://img-ask.csdn.net/upload/201901/05/1546694967_209297.jpg). 但是到了17就直接报错了,是根本就连接不了数据库,直接出现错误,我是真的没招了,请大神解答一下,本来找的资料学习的结果出了这种情况真的难受.17控制台错误![图片说明](https://img-ask.csdn.net/upload/201901/05/1546695129_400901.jpg),17页面显示![图片说明](https://img-ask.csdn.net/upload/201901/05/1546695154_301226.jpg),17具体代码实现,Servlet![图片说明](https://img-ask.csdn.net/upload/201901/05/1546695229_352965.jpg),Jsp![图片说明](https://img-ask.csdn.net/upload/201901/05/1546695236_696564.jpg),15代码我就不贴了,基本一致,就是把javaBean改了改,然后把BeanListHandler里面的也改了改,总体思路是一致的,但是就是一个可以输出一个无法输出.顺带说下,我上网查了很多,都没用,权限也有,就是报错.

Android 中使用c3p0连接池报错,错误: 无法访问Referenceable

Android 中使用c3p0连接池报错,错误: 无法访问Referenceable,该如何解决,有没有大神使用过![图片说明](https://img-ask.csdn.net/upload/202003/28/1585385580_936349.jpg)

c3p0遇到报错: 对实体 "serverTimezone" 的引用必须以 ';' 分隔符结尾”

已将&修改但仍然报错“对实体 "serverTimezone" 的引用必须以 ';' 分隔符结尾” ``` <property name="jdbcUrl">jdbc:mysql://localhost:3306/chapter02?useSSL=true&amp;serverTimezone=UTC</property> ``` 甚至尝试删掉此文件依旧是这样报错 四月 09, 2019 6:27:47 下午 com.mchange.v2.log.MLog <clinit> 信息: MLog clients using java 1.4+ standard logging. [Fatal Error] :7:94: 对实体 "serverTimezone" 的引用必须以 ';' 分隔符结尾。 四月 09, 2019 6:27:47 下午 com.mchange.v2.c3p0.cfg.C3P0Config <clinit> 警告: XML configuration disabled! Verify that standard XML libs are available. org.xml.sax.SAXParseException; lineNumber: 7; columnNumber: 94; 对实体 "serverTimezone" 的引用必须以 ';' 分隔符结尾。 at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:257) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:339) at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:121) at com.mchange.v2.c3p0.cfg.C3P0ConfigXmlUtils.extractXmlConfigFromInputStream(C3P0ConfigXmlUtils.java:148) at com.mchange.v2.c3p0.cfg.C3P0ConfigXmlUtils.extractXmlConfigFromDefaultResource(C3P0ConfigXmlUtils.java:131) at com.mchange.v2.c3p0.cfg.DefaultC3P0ConfigFinder.findConfig(DefaultC3P0ConfigFinder.java:62) at com.mchange.v2.c3p0.cfg.C3P0Config.<clinit>(C3P0Config.java:104) at com.mchange.v2.c3p0.impl.PoolBackedDataSourceBase.<init>(PoolBackedDataSourceBase.java:49) at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.<init>(AbstractPoolBackedDataSource.java:74) at com.mchange.v2.c3p0.ComboPooledDataSource.<init>(ComboPooledDataSource.java:134) at com.mchange.v2.c3p0.ComboPooledDataSource.<init>(ComboPooledDataSource.java:130) at com.mchange.v2.c3p0.ComboPooledDataSource.<init>(ComboPooledDataSource.java:207) at cn.itcast.jdbc.example.Example05.<clinit>(Example05.java:8) 四月 09, 2019 6:27:48 下午 com.mchange.v2.c3p0.C3P0Registry banner 信息: Initializing c3p0-0.9.2.1 [built 20-March-2013 11:16:28 +0000; debug? true; trace: 10] 四月 09, 2019 6:27:48 下午 com.mchange.v2.c3p0.cfg.C3P0Config getUnspecifiedUserProperties 警告: named-config with name 'itcast' does not exist. Using default-config. 四月 09, 2019 6:27:48 下午 com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource getPoolManager 信息: Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, dataSourceName -> itcast, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> null, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> 1hge13ba2gdkdl1e9vvli|65b3120a, idleConnectionTestPeriod -> 0, initialPoolSize -> 3, jdbcUrl -> null, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 15, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 3, numHelperThreads -> 3, preferredTestQuery -> null, properties -> {}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies -> false ] 四月 09, 2019 6:28:19 下午 com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask run 警告: com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@1c02988a -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: java.sql.SQLException: No suitable driver at java.sql.DriverManager.getDriver(DriverManager.java:315) at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:240) at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:131) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:156) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:145) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:200) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1086) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1073) at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:44) at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1810) at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:648) 四月 09, 2019 6:28:19 下午 com.mchange.v2.resourcepool.BasicResourcePool forceKillAcquires 警告: Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@6bc168e5 is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests. Exception in thread "main" java.sql.SQLException: Connections could not be acquired from the underlying database! at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:689) at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140) at cn.itcast.jdbc.example.Example05.main(Example05.java:12) Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source. at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1418) at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:606) at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:526) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:755) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:682) ... 2 more

项目启动时c3p0报错 求大神

com.mchange.v2.async.ThreadPoolAsynchronousRunner]com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@179d578 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks! [com.mchange.v2.async.ThreadPoolAsynchronousRunner]com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@179d578 -- APPARENT DEADLOCK!!! Complete Status: Managed Threads: 3 Active Threads: 3 Active Tasks: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@105a341 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2) com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@1213644 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1) com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@171e462 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0) Pending Tasks: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@48fc6b Pool thread stack traces: Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2,5,main] java.net.SocketInputStream.socketRead0(Native Method) java.net.SocketInputStream.read(SocketInputStream.java:129) java.io.DataInputStream.readFully(DataInputStream.java:178) java.io.DataInputStream.readFully(DataInputStream.java:152) net.sourceforge.jtds.jdbc.SharedSocket.readPacket(SharedSocket.java:842) net.sourceforge.jtds.jdbc.SharedSocket.getNetPacket(SharedSocket.java:723) net.sourceforge.jtds.jdbc.ResponseStream.getPacket(ResponseStream.java:466) net.sourceforge.jtds.jdbc.ResponseStream.read(ResponseStream.java:103) net.sourceforge.jtds.jdbc.TdsCore.nextToken(TdsCore.java:2206) net.sourceforge.jtds.jdbc.TdsCore.login(TdsCore.java:603) net.sourceforge.jtds.jdbc.ConnectionJDBC2.<init>(ConnectionJDBC2.java:357) net.sourceforge.jtds.jdbc.ConnectionJDBC3.<init>(ConnectionJDBC3.java:50) net.sourceforge.jtds.jdbc.Driver.connect(Driver.java:184) com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:135) com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182) com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171) com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137) com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014) com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32) com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810) com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547) Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1,5,main] java.net.SocketInputStream.socketRead0(Native Method) java.net.SocketInputStream.read(SocketInputStream.java:129) java.io.DataInputStream.readFully(DataInputStream.java:178) java.io.DataInputStream.readFully(DataInputStream.java:152) net.sourceforge.jtds.jdbc.SharedSocket.readPacket(SharedSocket.java:842) net.sourceforge.jtds.jdbc.SharedSocket.getNetPacket(SharedSocket.java:723) net.sourceforge.jtds.jdbc.ResponseStream.getPacket(ResponseStream.java:466) net.sourceforge.jtds.jdbc.ResponseStream.read(ResponseStream.java:103) net.sourceforge.jtds.jdbc.TdsCore.nextToken(TdsCore.java:2206) net.sourceforge.jtds.jdbc.TdsCore.login(TdsCore.java:603) net.sourceforge.jtds.jdbc.ConnectionJDBC2.<init>(ConnectionJDBC2.java:357) net.sourceforge.jtds.jdbc.ConnectionJDBC3.<init>(ConnectionJDBC3.java:50) net.sourceforge.jtds.jdbc.Driver.connect(Driver.java:184) com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:135) com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182) com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171) com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137) com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014) com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32) com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810) com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547) Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0,5,main] java.net.SocketInputStream.socketRead0(Native Method) java.net.SocketInputStream.read(SocketInputStream.java:129) java.io.DataInputStream.readFully(DataInputStream.java:178) java.io.DataInputStream.readFully(DataInputStream.java:152) net.sourceforge.jtds.jdbc.SharedSocket.readPacket(SharedSocket.java:842) net.sourceforge.jtds.jdbc.SharedSocket.getNetPacket(SharedSocket.java:723) net.sourceforge.jtds.jdbc.ResponseStream.getPacket(ResponseStream.java:466) net.sourceforge.jtds.jdbc.ResponseStream.read(ResponseStream.java:103) net.sourceforge.jtds.jdbc.TdsCore.nextToken(TdsCore.java:2206) net.sourceforge.jtds.jdbc.TdsCore.login(TdsCore.java:603) net.sourceforge.jtds.jdbc.ConnectionJDBC2.<init>(ConnectionJDBC2.java:357) net.sourceforge.jtds.jdbc.ConnectionJDBC3.<init>(ConnectionJDBC3.java:50) net.sourceforge.jtds.jdbc.Driver.connect(Driver.java:184) com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:135) com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182) com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171) com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137) com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014) com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32) com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810) com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)

发布到tomcat上的项目报错,找不到 .properties的文件,该怎么处理

![图片说明](https://img-ask.csdn.net/upload/201710/09/1507539343_646737.png)

御用配置文件方式实现c3p0

运用配置文件方式实现c3p0时总提示找不到合适的驱动,但是用最基本的方式实现c3p0 时可以找到,请教各位大神如何解决。 报错提示如下 ``` java.sql.SQLException: No suitable driver at java.sql.DriverManager.getDriver(DriverManager.java:315) at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:285) at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:161) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:161) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:147) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:202) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125) at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44) at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870) at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696) ``` c3p0-config.xml ``` <?xml version="1.0" encoding="UTF-8" ?> <c3p0-cofig> <default-config> <property name="driverClass">com.mysql.cj.jdbc.Driver</property> <property name="jdbcUrl">jdbc:mysql://localhost:3306/edb_71812</property> <property name="user">root</property> <property name="password">root</property> <!--当连接池中的连接耗尽的时候c3p0一次同时获得连接数--> <property name="acquireIncrement">5</property> <!--初始化时获取的连接个数,取值在minPoolSize和maxPoolSize之间--> <property name="initialPoolSize">10</property> <!--连接池中保留的最大连接池个数--> <property name="maxPoolSize">20</property> <!--连接池中保留的最小连接池个数--> <property name="minPoolSize">10</property> </default-config> <named-config name="sqlserver"> <property name="driverClass">com.microsoft.sqlserver.jdbc.SQLServerDriver</property> <property name="jdbcUrl">jdbc:sqlserver://localhost:1433;databaseName=edb_71812</property> <property name="user">sa</property> <property name="password">root</property> <!--当连接池中的连接耗尽的时候c3p0一次同时获得连接数--> <property name="acquireIncrement">5</property> <!--初始化时获取的连接个数,取值在minPoolSize和maxPoolSize之间--> <property name="initialPoolSize">10</property> <!--连接池中保留的最大连接池个数--> <property name="maxPoolSize">20</property> <!--连接池中保留的最小连接池个数--> <property name="minPoolSize">10</property> </named-config> </c3p0-cofig> ``` MysqlJDBCUtil ``` package com.mo.utils; import com.mchange.v2.c3p0.ComboPooledDataSource; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; public class MysqlJDBCUtil { private static ComboPooledDataSource ds = null; static { // System.setProperty("com.mchange.v2.c3p0.cfg.xml","/java/c3p0-config.xml"); ds = new ComboPooledDataSource(); } public static Connection getConnection() throws SQLException { return ds.getConnection(); } public static void free(Connection conn, PreparedStatement ps, ResultSet rs){ if(rs!=null){ try { rs.close(); } catch (SQLException e) { e.printStackTrace(); } } if(ps!=null){ try { ps.close(); } catch (SQLException e) { e.printStackTrace(); } } if(conn!=null){ try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } } ```

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