How do I recreate the NetBeans Matisse form file?

I have swing code that was generated using NetBeans Matisse. Over time, t开发者_开发百科he form file got lost. How do I recreate the Matisse form file?

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I don't think you can reverse engineer/recreate the .form file

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See Netbeans: using GUI Builder on regular Java class file

There is a FormGenerator utility that can usually regenerate a .form file from the .java file. It should work as long as the guarded blocks are largely unchanged