Can not set breakpoints due to missing line number attributes

Hi,
I am using Eclipse 3.0, Jboss to run my Java applications. Till yesterday I could set breakpoints and everything was working fine.
I didn't change any settings but it is not allowing me to set breakpoints anymore.
Error is:
Unable to install breakpoints due to missing line number attributes
I double checked the settings in window->preferences->compiler->classfiles
Add line number to class files is checked.
Is there anything else I can do?
Any help on this would be greatly appreciated.
Thanks
nmadhava

I'm facing the same problem (no line number information) on the following configuration:
Eclipse 3.1.1 SDK with WTP 1.0 feature, Weblogic 7.1, running on weblogic provided JVM: JDK 1.3.1_08
I have already done the following:
1/ Re-checking debug preferences in Eclipse and rebuild all projects in the workspace then redeploy via ANT.
2/ Building via ANT1.6.2 with all javac tasks set to debug="on" and redeploy
Breakpoint is located in code section residing in one of the workspace's projects. But I don't know weather 3rd-party jar resources have been compiled with debug enabled or not; I suppose however it does not matter as I do not try to debug 3rd-party code but ours.
Any suggestion appreciated.
Regards

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