Eclipse sets breakpoints in JDK source to debug error Unable to install breakpoint solution

The error is due to importing the wrong JRE System Library, which is importing the wrong JDK libraries.

First step: Click Window->preferences->java->installed JREs, edit the selected JRE, select the directory for the JDK installation directory: (the directory you should choose here is the JDK directory itself, Instead of the JRE directory that came with the JDK installation)

Click Restore Default, then finish, Apply, OK.

Step Two: Click Window->preferences->java->compiler-> to uncheck Add line number attributes ..., click Apply, then tick add line Number attributes ..., click Apply, OK:

Re-open the JDK source code, set breakpoints, you can debug normally.