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Once I mount a web application. All the jars in that web application's webinf/lib folders are locked even after I unmount the web application. If in any case I have to rebuild a jar in the lib folder I need to unmount the web application close and restart the IDE and then I can delete and rebuild the jar files.
Duplicate of the infamous "bug from hell". *** This issue has been marked as a duplicate of 20384 ***