解決方法一
重置窗口布局：
windows > perspective > reset perspective
解決方法二:
如果上述方法不好使，采用下面的這種方法：
刪除workspace的/.metadata/.plugins/org.eclipse.core.resources/.project，然后重新啟動Eclipse【此方法可能會對項目造成影響，慎用】
啟動Eclipse時An internal error occurred during: "Initializing Java Tooling".錯誤
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