To enable stepping into JDK sources for a debugged application:
1. Start the debugger for the application.
2. Open the Sources window by choosing Window | Debugging | Sources or by
pressing Alt-Shift-8.
3. Select the Use For Debugging checkbox for the JDK.
这个是开启jdk source debug的, 反过来,把对应那个勾掉应该就可以了