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compiler-construction debugging eclipse java

How to debug .class files in ECLIPSE?

I am using Eclipse 3.5 and I attached the src.zip to my global settings in Eclipse.
Windows–> Preferences –>Java –>Installed JREs –>rt.jar – Source attachment – …../jdk/src.zip

I am successfully able to step in the java core library .class files and view the source code. I building a Class which uses the LinkedList and I have set a breakpoint inside the LinkedList class.

When I debug the breakpoints in my source code (my projects) are working good but when I need to step into the java core lib .classes I get the following error in my Eclipse
eclipse error

Unable to install breakpoint in java.util.LinkedList due to missing line Number attributes. Modify complier options to generate line number attributes.

I checked my complier settings in Preferences and found all options checked true.
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It would to great if someone can help me resolve this issue.

Thanks in advance.