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！！！

急急急急急急！！！！！

错误信息如下：

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.startup.HostConfig.reload(HostConfig.java:1548)

at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1512)

at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1748)

at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:333)

at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)

at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)

at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1370)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1542)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1520)

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 16:18:09 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.startup.HostConfig.reload(HostConfig.java:1548)

at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1512)

at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1748)

at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:333)

at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)

at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)

at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1370)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1542)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1520)

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