An internal error has occurred. java.lang.NullPointerException
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my ecplise上将工程部署到应用下时，经常出现 An internal error has occurred. java.lang.NullPointException 错误。很让人郁闷。 究其原因，一般是因为项目从别处导入的，从cvs上down下来的等。
方法一：jdk版本不一致。具体步骤如下：
右键项目名→Properties→Java Build Path→Libraries→选中JRE System Library[Sun JDK 1.6.0_13]→Edit→选中“Workspace default JRE(Sun JDK 1.6.0_13)”→Finish
方法一：jdk版本不一致。具体步骤如下：
右键项目名→Properties→Java Build Path→Libraries→选中JRE System Library[Sun JDK 1.6.0_13]→Edit→选中“Workspace default JRE(Sun JDK 1.6.0_13)”→Finish
以上是以你本地JDK版本为主
方法二：
把my ecplise和Tomcat下 的项目删除掉，然后在my ecplise----Tomcat把项目添加进去即可；
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