Eclipse启动时发生An internal error occurred during: "Initializing Java Tooling".错误（发生内部错误：在“初始化java工具”。）
解决方法：
1、通过【重置窗口布局】，可解决大部分情况：
点击菜单导航栏的windows > perspective > reset perspective
2、如果【重置窗口布局】无效，再尝试下面这个方案（此方案可能会影响工作空间中的项目）
删除工作目录下面的.project文件夹： 如下图：
An internal error occurred during: "Initializing Java Tooling". java.lang.NullPointerException
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