Eclipse每次打開.java文件時，報錯信息如下：
An internal error occurred during: "J2EE Component Mapping Update". java.lang.NullPointerException
解決辦法：
1 找到工作區該項目目錄，刪除.settings文件夾。
2 Eclipse刪除該項目（本地項目文件不要刪除）。
3 重啟Eclipse，重新導入該項目。
Eclipse報錯An internal error occurred during: "J2EE Component Mapping Update". java.lang.NullPointerException
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