Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: j

JPA 持久化对象

其实啊,这种错误是不应该出的,因为前面开发了很多小程序,不应该在这个环节出问题的,其实主要的原因是少了jndi文件。所以,在写程序的时候一定要细心,要不然就是给自己找麻烦

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