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1) Clean and Build a webapp 2) Run the webapp in tomcat 3) Clean and Build the webapp Gives the following output: init: deps-clean: do-clean: Deleting directory C:\Documents and Settings\010rolhei\My Documents\NetBeansProjects\Bessy\build C:\Documents and Settings\010rolhei\My Documents\NetBeansProjects\Bessy\nbproject\build-impl.xml:814: Unable to delete file C:\Documents and Settings\010rolhei\My Documents\NetBeansProjects\Bessy\build\web\WEB-INF\lib\activation.jar BUILD FAILED (total time: 15 seconds) To me it seems being local to Windows (works in OS X for example). NetBeans 6.1 Tomcat 5.5.26 Java 1.6 Windows XP
If you are using default Context implementation you can use antiJARLocking="true" in you context.xml. It should help. *** This issue has been marked as a duplicate of 112529 ***