An internal error occurred during: "Initializing Java Tooling"

An internal error occurred during: "Initializing Java Tooling".
java.lang.NullPointerException

An internal error occurred during “Initializing Java Tooling.” in Eclipse on startup

I am getting this strange error on startup. What could be wrong in my environment?

Do not delete all the full .metadata

Backup .metadata

delete only .metadata/.plugins/org.eclipse.core.resources/.project

restart eclipse

An internal error occurred during: "Initializing Java Tooling"

Eclipse启动时发生An internal error occurred during: "Initializing Java Tooling".错误

解决方法:

删除当前工作目录下的WORKSPACE/.metadata/.plugins/org.eclipse.core.resources/.project，

然后重新启动Eclipse

Hello world!

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