Eclipse每次打开.java文件时，报错信息如下：
An internal error occurred during: "J2EE Component Mapping Update". java.lang.NullPointerException
解决办法：
1 找到工作区该项目目录，删除.settings文件夹。
2 Eclipse删除该项目（本地项目文件不要删除）。
3 重启Eclipse，重新导入该项目。
Eclipse报错An internal error occurred during: "J2EE Component Mapping Update". java.lang.NullPointerException
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