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Build Identifier: 20100218-1602 When working with a JFrame, it disappears on an arbitrary step. When I close the project and reopen it, there is a text writter this-"jFrame" with a frame and red cross icon on it. Also when I mouse over it, a tooltip pops up written null pointer exception. Reproducible: Sometimes Steps to Reproduce: Just working with it causes this bug so there are no spesific steps.