ssh项目启动tomcat出现的问题

在写完ssh登陆后，我启动tomcat报出了这样的异常：Error creating bean with name
'mlogin' defined in ServletContext resource
[/WEB-INF/applicationContext.xml]: Cannot resolve reference to bean
'SessionFactory' while setting bean property 'sessionFactory';
nested exception is
org.springframework.beans.factory.BeanCreationException: Error
creating bean with name 'SessionFactory' defined in ServletContext
resource [/WEB-INF/applicationContext.xml]: Cannot resolve
reference to bean 'bookshop' while setting bean property
'dataSource'; nested exception is
org.springframework.beans.factory.BeanCreationException: Error
creating bean with name 'bookshop' defined in ServletContext
resource [/WEB-INF/applicationContext.xml]: Instantiation of bean
failed; nested exception is java.lang.NoClassDefFoundError:
org/apache/commons/pool/impl/GenericObjectPool。

解决的方法和出错的原因：

因为路径中存在和asm-2.2.3.jar冲突的包。

删除asm-2.2.3.jar问题就解决了。

删除asm-2.2.3.jar的方法：右键所建的工程,点properties——>java
Build path--->libaries,把asm-2.2.3.jar包remove了
(开发工具是myeclipse).