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Create some form and put some components(e.g. jLabel) in. Using PropertySheet try to add some JavaDoc to comment jLabel. You will be warned: "Attempt to modify guarded block". No changes are made in source. This is correct behavior, but if you enter JavaDoc Comment from PropertySheet again, you will see your comment, although in source code there is no one.
Text of JavaDoc object is reverted to the previous value if it can't be written into the source.
Resolved for 3.4.x or earlier, no new info since then -> closing.