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.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$1.getObject(AbstractBeanFactory.java:312) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:443) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:325) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4682) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5143) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at 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 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:344) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:475) Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userService': Unsatisfied dependency expressed through field 'userDao'; nested exception is 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.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

启动tomcat8一直报错,找不到原因

![图片说明](https://img-ask.csdn.net/upload/201904/28/1556434589_157544.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 ```

Java使用c3p0连接池报错,请大佬帮忙解答

问题如图,请问有没有人知道是怎么回事,该怎么解决啊![图片说明](https://img-ask.csdn.net/upload/201708/21/1503284876_30091.png)

SSH整合,启动tomcat报错找不到Spring的配置文件

十月 28, 2016 8:11:34 上午 org.apache.catalina.core.AprLifecycleListener init 信息: Loaded APR based Apache Tomcat Native library 1.1.29 using APR version 1.4.8. 十月 28, 2016 8:11:34 上午 org.apache.catalina.core.AprLifecycleListener init 信息: APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true]. 十月 28, 2016 8:11:36 上午 org.apache.catalina.core.AprLifecycleListener initializeSSL 信息: OpenSSL successfully initialized (OpenSSL 1.0.1e 11 Feb 2013) 十月 28, 2016 8:11:36 上午 org.apache.coyote.AbstractProtocol init 信息: Initializing ProtocolHandler ["http-apr-8080"] 十月 28, 2016 8:11:36 上午 org.apache.coyote.AbstractProtocol init 信息: Initializing ProtocolHandler ["ajp-apr-8009"] 十月 28, 2016 8:11:36 上午 org.apache.catalina.startup.Catalina load 信息: Initialization processed in 2856 ms 十月 28, 2016 8:11:36 上午 org.apache.catalina.core.StandardService startInternal 信息: Starting service Catalina 十月 28, 2016 8:11:36 上午 org.apache.catalina.core.StandardEngine startInternal 信息: Starting Servlet Engine: Apache Tomcat/7.0.52 十月 28, 2016 8:11:36 上午 org.apache.catalina.startup.HostConfig deployDirectory 信息: Deploying web application directory H:\tomcat\apache-tomcat-7.0.52\webapps\gh 十月 28, 2016 8:11:53 上午 org.apache.catalina.core.ApplicationContext log _信息: No Spring WebApplicationInitializer types detected on classpath_ 十月 28, 2016 8:11:55 上午 org.apache.catalina.core.ApplicationContext log 信息: Initializing Spring root WebApplicationContext 十月 28, 2016 8:12:03 上午 com.mchange.v2.log.MLog <clinit> 信息: MLog clients using java 1.4+ standard logging. 十月 28, 2016 8:12:04 上午 com.mchange.v2.c3p0.C3P0Registry banner 信息: Initializing c3p0-0.9.2.1 [built 20-March-2013 10:47:27 +0000; debug? true; trace: 10] 十月 28, 2016 8:12:12 上午 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 -> 1bqp7459k2e709gh0u9tz|3cd2eb, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> 1bqp7459k2e709gh0u9tz|3cd2eb, idleConnectionTestPeriod -> 0, initialPoolSize -> 3, jdbcUrl -> jdbc:mysql:///registersys?characterEncoding=utf-8, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 15, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 3, numHelperThreads -> 3, preferredTestQuery -> null, properties -> {user=******, password=******}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies -> false ] 2016-10-28 08:12:20,005 WARN [localhost-startStop-1] support.AbstractApplicationContext (AbstractApplicationContext.java:544) - Exception encountered during context initialization - cancelling refresh attempt org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDao': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister____

c3p0 连接数据库超时问题

我在工程里面使用c3p0做数据库连接池。在测试功能时平方重启应用。发现在重启时出现连接数据库超时。如果重新再重启应用将能够正常连接数据库。 提示超时的速度非常快,正常连接不上数据库会60秒后再提示连接超时。 是否有人遇到同样的问题? c3p0配置如下: ``` <property name="checkoutTimeout">30000</property> <property name="idleConnectionTestPeriod">1200</property> <property name="maxIdleTime">800</property> <property name="maxIdleTimeExcessConnections">120</property> <property name="maxConnectionAge">200</property> <property name="unreturnedConnectionTimeout">1000</property> <property name="maxPoolSize">300</property> <property name="minPoolSize">50</property> <property name="initialPoolSize">50</property> <property name="acquireIncrement">1</property> <property name="numHelperThreads">8</property> ```

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)

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)

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Skipping unneeded JARs during scanning can improve startup time and JSP compilation time. 十一月 29, 2017 4:03:27 下午 org.apache.coyote.AbstractProtocol start 信息: Starting ProtocolHandler ["http-bio-8080"] 十一月 29, 2017 4:03:27 下午 org.apache.coyote.AbstractProtocol start 信息: Starting ProtocolHandler ["ajp-bio-8009"] 十一月 29, 2017 4:03:27 下午 org.apache.catalina.startup.Catalina start 信息: Server startup in 1988 ms 16:03:27,866 INFO [JForumBaseServlet ] Starting JForum. Debug mode is true 16:03:27,873 INFO [ConfigLoader ] Using cache engine: net.jforum.cache.DefaultCacheEngine 16:03:27,876 INFO [ConfigLoader ] Creating an instance of net.jforum.repository.BBCodeRepository 16:03:27,878 INFO [ConfigLoader ] Creating an instance of net.jforum.repository.RankingRepository 16:03:27,880 INFO [ConfigLoader ] Creating an instance of net.jforum.repository.SmiliesRepository 16:03:27,881 INFO [ConfigLoader ] Creating an instance of net.jforum.repository.ForumRepository 16:03:27,884 INFO [ConfigLoader ] Creating an instance of net.jforum.repository.TopicRepository 16:03:27,887 INFO [ConfigLoader ] Creating an instance of net.jforum.SessionFacade 16:03:27,888 INFO [ConfigLoader ] Creating an instance of net.jforum.repository.PostRepository 16:03:27,889 INFO [ConfigLoader ] Creating an instance of net.jforum.repository.Tpl 16:03:27,891 INFO [ConfigLoader ] Creating an instance of net.jforum.repository.RolesRepository 16:03:27,891 INFO [ConfigLoader ] Creating an instance of net.jforum.repository.SecurityRepository 16:03:27,893 INFO [ConfigLoader ] Creating an instance of net.jforum.repository.BanlistRepository 16:03:27,951 INFO [FileMonitor ] Watching J:\tool\eclipse_mars\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\JForumBBS/WEB-INF/config/languages/en_US.properties 16:03:27,953 INFO [FileMonitor ] Watching J:\tool\eclipse_mars\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\JForumBBS/WEB-INF/config/languages/zh_CN.properties 16:03:27,969 INFO [ConfigLoader ] Loading JDBC driver net.jforum.dao.mysql.MysqlDataAccessDriver 16:03:28,026 INFO [FileMonitor ] Watching J:\tool\eclipse_mars\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\JForumBBS/WEB-INF/config/database/generic/generic_queries.sql 16:03:28,026 INFO [FileMonitor ] Watching J:\tool\eclipse_mars\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\JForumBBS/WEB-INF/config/database/mysql/mysql.sql 16:03:28,027 INFO [FileMonitor ] Watching J:\tool\eclipse_mars\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\JForumBBS/WEB-INF/config/SystemGlobals.properties 16:03:28,102 INFO [MLog ] MLog clients using log4j logging. 16:03:28,127 INFO [C3P0Registry ] Initializing c3p0-0.9.1-pre9 [built 23-September-2006 01:47:24; debug? true; trace: 10] 16:03:28,184 INFO [AbstractPoolBackedDataSource] Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 120000, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, dataSourceName -> 650b287f, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> 650b287f, idleConnectionTestPeriod -> 3600, initialPoolSize -> 3, jdbcUrl -> jdbc:mysql://localhost:3306/jforum?user=root&password=root&autoReconnect=true&useNewIO=false&zeroDateTimeBehavior=convertToNull&useServerPrepStmts=false&dumpQueriesOnException=true&jdbcCompliantTruncation=false&useUnicode=true&characterEncoding=utf8, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 1000, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 5, numHelperThreads -> 3, preferredTestQuery -> null, properties -> {}, propertyCycle -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 180, usesTraditionalReflectiveProxies -> false ] 16:03:48,172 WARN [ThreadPoolAsynchronousRunner] com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@23eb54ea -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks! 16:03:48,174 WARN [ThreadPoolAsynchronousRunner] com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@23eb54ea -- APPARENT DEADLOCK!!! Complete Status: Managed Threads: 3 Active Threads: 3 Active Tasks: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@7dec08b1 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1) com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@132edd0d (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0) com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@69b28a51 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2) Pending Tasks: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@4897020d com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@3207c8b6 Pool thread stack traces: Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2,5,main] java.lang.Thread.sleep(Native Method) com.mysql.jdbc.Connection.createNewIO(Connection.java:2828) com.mysql.jdbc.Connection.<init>(Connection.java:1531) com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266) com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:120) com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:143) com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:132) com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:129) com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:862) com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:33) com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1527) com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547) Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0,5,main] java.lang.Thread.sleep(Native Method) com.mysql.jdbc.Connection.createNewIO(Connection.java:2828) com.mysql.jdbc.Connection.<init>(Connection.java:1531) com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266) com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:120) com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:143) com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:132) com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:129)

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Windows版YOLOv4目标检测实战:训练自己的数据集

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