How can I set breakpoint in Eclipse?

Question

I've got this error when trying to set a breakpoint in a library class (in a .class file)

The error says that i don't generate line number attributes, while in preferences i have them enabled Picture here

I've tried also re-downloading eclipse and reinstalling java, but nothing changed

Answer 1

You cannot debug *.class files. You may debug your own *.java files. Look at this helpful article: http://www.vogella.com/tutorials/EclipseDebugging/article.html
I think, It many helps you.