找不到基本对象池：“java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/GenericObjectPool”解决方法

问题：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'DataSource' defined in ServletContext resource [/WEB-INF/classes/applicationContext.xml]: Instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError:
org/apache/commons/pool/impl/GenericObjectPool

Caused by:

java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/GenericObjectPool

at java.lang.Class.getDeclaredConstructors0(Native Method)

at java.lang.Class.privateGetDeclaredConstructors(Class.java:2328)

at java.lang.Class.getConstructor0(Class.java:2640)

at java.lang.Class.getDeclaredConstructor(Class.java:1953)

at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:54)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:752)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:717)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:386)

at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:249)

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:155)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:246)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)

at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:291)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)

at org.springframework.web.struts.ContextLoaderPlugIn.createWebApplicationContext(ContextLoaderPlugIn.java:354)

at org.springframework.web.struts.ContextLoaderPlugIn.initWebApplicationContext(ContextLoaderPlugIn.java:295)

at org.springframework.web.struts.ContextLoaderPlugIn.init(ContextLoaderPlugIn.java:225)

at org.apache.struts.action.ActionServlet.initModulePlugIns(ActionServlet.java:869)

at org.apache.struts.action.ActionServlet.init(ActionServlet.java:336)

at javax.servlet.GenericServlet.init(GenericServlet.java:212)

at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1161)

at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:981)

at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4058)

at org.apache.catalina.core.StandardContext.start(StandardContext.java:4364)

at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)

at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)

at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)

at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:924)

at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:887)

at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)

at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1147)

at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)

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

at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)

at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)

at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)

at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)

at org.apache.catalina.core.StandardService.start(StandardService.java:516)

at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)

at org.apache.catalina.startup.Catalina.start(Catalina.java:578)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:585)

at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)

at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

原因：

找不到 Caused by: java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/GenericObjectPool

就Apache所提供的基本对象池。

解决：

到这里http://commons.apache.org/downloads/download_pool.cgi下载包，然后,把里面的commons-pool-x.jar复制到myEclipse的Referenced Libraries下.