Programmer algorithm practice must read, common Java API skills to share>>> 
1. Start eclipse and report an internal error occurred during: “initializing Java tooling”. Java.lang.nullpointerexception
2. Solutions:
First, close eclipse and delete the files in the workspace D: Eclipse workspace. Metadata. Plugins. Org. Eclipse. Core. Resources. Projects
3. Restart eclipse with the following error message:
4. Close eclipse, delete the workspace D: Eclipse workspace. Metadata. Plugins. Org. Eclipse. Core. Resources. Projects file, and delete the file directly
5. Be careful not to delete “\. Org. Eclipse. JDT. Core. External. Folders \. Markers” to avoid the following error message when closing Eclipse:
Problems occurred while trying to save the state of the workbench
6. Restart eclipse and solve the problem
7. Summary: practice by hand and share with those in need
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