今天在调试spring时出现了下面的错误:

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating
bean with name dataSource defined in class path resource [applicationCon
text.xml]: Instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/GenericObj
ectPool
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.BeanUtils.instantiateClass(BeanUtils.java:60)
 at org.springframework.beans.factory.support.SimpleInstantiationStrategy
.insta
ntiate(SimpleInstantiationStrategy.java:45)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanF
actory.instantiateBean(AbstractAutowireCapableBeanFactory.java:739)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanF
actory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:727)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanF
actory.createBean(AbstractAutowireCapableBeanFactory.java:390)
 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:254)
 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.g
etSingleton(DefaultSingletonBeanRegistry.java:144)
 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:251)
 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:163)
 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preI
nstantiateSingletons(DefaultListableBeanFactory.java:284)
 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 com.zb.test.TestUsers.main(TestUsers.java:17)

问题的产生是由于没有引入dbcp所依赖jar文件，看看apache官方的申明：“Commons-DBCP depends at runtime on commons-pool and commons-collections”。在项目中将文件引用，ＯＫ；
下载地址：
http://jakarta.apache.org/commons/pool/downloads.html

ＯＫ，测试成功了～