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1) Create a new JFrame class from "New From Template" menu. 2) Add JEditorPane or JTextArea into the Form Editor. 3) Go to Synthetic properties in Component Inspector 4) Go to "Serialize To" filed, click into the textfield and press Enter. 5) Change the Code Generation to Serialize. 6) Go to the Editor and push "save" from the menu or push "save" icon on the main window. 7) NetBeans freezes in a deadlock. Thread dump is in the attachment.
Form editor issue.
Resolved for 3.3.x or earlier, no new info since then -> closing.