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(I see this problem in the S1S trunk codeline) I check out the form class, select a JPanel in the treeview panel of the form editor, and then run "Customize Layout" on that JPanel. It causes the attached exception. Note: this form has never before been edited by the form editor in this codeline. The class is: com.sun.forte4j.webdesigner.client.wizard.fromUDDI.CreateWS ClientUDDISelectTModelPanel
Created attachment 9670 [details] exception stack trace
if I subsequently try the same operation on this same form, then the layout editor comes up without an exception being thrown.
Problem with TableModel deserialization. See issue 21115 for a workaround. If the table was just empty (most probably - look at original generated code), just ignore the error (you don't lose anything); or re-add the table. *** This issue has been marked as a duplicate of 21115 ***