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How to debug .class files in ECLIPSE?

I am using Eclipse 3.5 and I have bound src.zip to my global settings in Eclipse. Windows → Settings → Java → Installed JREs → rt.jar - Source Attachment -..... / jdk / src.zip

I can successfully enter the java library .class files and view the source code. I am creating a class that uses LinkedList, and I set a breakpoint in the LinkedList class.

When I debug breakpoints in my source code (my projects), they work fine, but when I need to go to java core lib.classes, I get the following error in my Eclipse eclipse error

Unable to set breakpoint in java.util.LinkedList due to missing line number attributes. Change the mapping options to create line number attributes.

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