Spring + OpenJpa 错误,菜鸟求助!! 最近做的项目需要用JPA做统一数据层 我用的JPA实现是Apache的OpenJPA, 在跟Spring结合使用的时候出现了个很低级的问题(求别喷),报错如下 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in ServletContext resource [/WEB-INF/classes/application-context.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: javax/persistence/PersistenceException . . . . Caused by: java.lang.NoClassDefFoundError: javax/persistence/PersistenceException