Caused by: java.lang.NoClassDefFound...

[url=http://www.blogjava.net/lusm/archive/2007/09/28/149363.html]Caused by: java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/GenericObjectPool


Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in file [D:\HS_Test\WebRoot\WEB-INF\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(Unknown Source)


at java.lang.Class.getConstructor0(Unknown Source)


at java.lang.Class.getDeclaredConstructor(Unknown Source)


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.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:93)


at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:77)


at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:67)
原因是工具myEclipse在建立SessionFactory的时候，少加一个包 commons-pool-1.3.jar 补上去问题解决。

延伸阅读