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This problem has been seen since netbeans vw 5.5, in manual testing, sanity test, component automation test. But it is intermittent. I could not provide reproducible steps. When deploy a JEE5 vw project, it fails at first time with error : \webApplication1\nbproject\build-impl.xml:461: deploy fail null When click run button to deploy again, everything looks ok and deploy succeed. The screen shot is available in attachment.
Created attachment 40376 [details] screen shot
The deployment descriptor has been reimplemented in NetBeans 6.0 and I no longer see this issue.