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I think it would be usable if debugger can detect that used classes are compiled without debug info. Debugger checks it during submitting of breakpoints but I think it should not be depends on breakpoints. The warning would be displayed in Debugger Console immediately after start of debugging and the message would be highlighted. It would be usable mainly for freeform projects where user can easily forget to add debug attribute to javac task. But it should be checked for all opened projects used in debugging session.