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The visual designer creates a private org.jdesktop.beansbinding.BindingGroup bindingGroup; field when using BeansBinding. While any Swing component is Serializable, bindingGroup isn't; thus it should be declared as transient. While this causes no harm, it produces false positive warnings with static code analyzers such as FindBugs.
Reassigning to form for evaluation.
It sounds reasonable to me, your request/issue is valid. Thank you for your report.
What about the status of this issue? In 8.1 this field is still not transient.