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Java project > Project Properties > Application > Web Start On Linux, move the Project Properties window to another Workspace. For example click Project Properties title bar and select 'Send to' or Workspace. Move the Project Properties window to a workspace different to the one NetBeans is occupying. Click the Self-signed check box. Result: Netbeans crashes and in some case X crashes to. I am able to reproduce this every time using Fluxbox window manager and jdk1.6.0_21.
pls attach jdk crash dump and reopen also, is this problem reproducible with a different window manager?