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Can we debug classes present in rt.jar?

I have atteched the source file to project. I want to debug a method of say ArrayList. I placed a breakpoint also in that method but on debugging it gives error -unable to install breakpoint in eclipse due to missing line number attributes.Its a desktop application.

使用JDK系统库而不是JRE,后者不会与必要的调试信息一起编译。

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