java - Netbeans Swing UI designer - what does the hazard icon mean? -


i'm working in design view of swing application , occassionally see small hazard warning symbol appear in top corner of component.

i assumed visibility overlap or similar having adjusted things can't match guess against credible. unfortunately doesn't have tool-tip , not react mouse clicks.

any ideas? google not seem suggest either.

the netbeans topic, java file , object node icons, may identify icon in question. tool tips on each icon indicate relevant name. 1 labeled error badge, example, means "the file cannot parsed."


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