An internal error occurred during: "Setup check". Java.lang.NullPointerException

There is a. Metadata folder under Eclipse's workspace, and the log file for Eclipse's exception appears in this directory.

A recent error has occurred:

View Log file Discovery:
! ENTRY org.eclipse.core.jobs 4 2 2011-08-03 09:33:32.843
! MESSAGE An internal error occurred during: "Updating indexes".
! STACK 0
Java.lang.OutOfMemoryError:Java Heap Space

"Solution"
Windows---Preference---maven---- uncheck Download repository index updates on startup

Multiple situations can cause this error. You can resolve most situations by resetting the window layout:

Click on the menu navigation bar of Windows > Perspective > Reset Perspective

(Online mainstream program is to delete a configuration folder, will have an impact on the original project, it is recommended: If "Reset Window Layout" is not valid, then try that scenario.)

Online another way of saying JDK, this is not a very small probability, check the Eclipse Global properties of the installed JRE refers to the non-existent JDK)

An internal error occurred during: "Setup check". Java.lang.NullPointerException