org/apache/commons/pool/impl/GenericObjectPool异常

pennate

　　org/apache/commons/pool/impl/GenericObjectPool异常
　　前段时间在做一个Spring2.0+Struts1.2练习的时候遇到的一个问题
　　问题：
　　

log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).

log4j:WARN Please initialize the log4j system properly.

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'DataSource' defined in class path resource [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:759)

      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:724)

      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:387)

      at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)

      at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)

      at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)

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

      at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:287)

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

      at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:91)

      at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:75)

      at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:65)

      at org.jzb.test.Test.main(Test.java:15)
原因：
   找不到 Caused by: java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/GenericObjectPool
就是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.
　　MyEclipse工具在添加Spring支持的时候，少加一个包 commons-pool-1.x.jar，补上去问题解决(放到\WebRoot\WEB-INF\lib目录下)。