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(DATA LOSS!) jdk 6.0 daily (tested using b79-i386 and b80-amd64) various netbeans versions (5.5 j2ee preview, 6.0 daily, others) linux (64-bit and 32-bit) at least part of this is a JDK bug (see below). a parent bug needs to be filed. 1. open netbeans. 2. select 'File-->New Project'. 3. select 'Web-->Web Application', click 'Next'. 4. under 'Server:', select 'Bundled Tomcat'. 5. click 'Finish'. the new project is created normally. 6. under the 'Files' view, navigate to 'WebApplication1-->web-->WEB-INF'. 7! right-click on 'web.xml' to open the context menu. netbeans locks up with 100% cpu. waited at least 10 minutes on a 2GHz machine. on 64-bit systems, the entire Gnome desktop locks up. you have to telnet in and kill the java process. this is obviously a very major JDK bug. on 32-bit systems, the desktop still responds and you can press CTRL-\ in the console to get a stack trace (attached).
Created attachment 29881 [details] stack trace
i should also mention that this lockup also occurs whenever you try to open some (but not all) xml files for editing.
Yes, it's known problem, thanks for you report anyway. *** This issue has been marked as a duplicate of 74362 ***