swing - Java repaint region errors -


this error halts working of ui

does know how solve it?

this error hangs ui occurs when repaint or update ui.

     exception in thread "awt-eventqueue-0" java.lang.nullpointerexception             @ javax.swing.plaf.synth.synthlookandfeel.paintregion(unknown source)             @ javax.swing.plaf.synth.synthlookandfeel.update(unknown source)             @ javax.swing.plaf.synth.synthpanelui.update(unknown source)             @ javax.swing.jcomponent.paintcomponent(unknown source)             @ javax.swing.jcomponent.paint(unknown source)             @ javax.swing.jcomponent.paintchildren(unknown source)             @ javax.swing.jcomponent.paint(unknown source)             @ javax.swing.jcomponent.paintchildren(unknown source)             @ javax.swing.jcomponent.paint(unknown source)             @ javax.swing.jcomponent.paintchildren(unknown source)             @ javax.swing.jcomponent.paint(unknown source)             @ javax.swing.jlayeredpane.paint(unknown source)             @ javax.swing.jcomponent.paintchildren(unknown source)             @ javax.swing.jcomponent.painttooffscreen(unknown source)             @ javax.swing.repaintmanager$paintmanager.paintdoublebuffered(unknown source)             @ javax.swing.repaintmanager$paintmanager.paint(unknown source)             @ javax.swing.repaintmanager.paint(unknown source)             @ javax.swing.jcomponent.paint(unknown source)             @ java.awt.graphicscallback$paintcallback.run(unknown source)             @ sun.awt.sungraphicscallback.runonecomponent(unknown source)             @ sun.awt.sungraphicscallback.runcomponents(unknown source)             @ java.awt.container.paint(unknown source)             @ java.awt.window.paint(unknown source)             @ javax.swing.repaintmanager$3.run(unknown source)             @ javax.swing.repaintmanager$3.run(unknown source)             @ java.security.accesscontroller.doprivileged(native method)             @ java.security.protectiondomain$1.dointersectionprivilege(unknown source)             @ javax.swing.repaintmanager.paintdirtyregions(unknown source)             @ javax.swing.repaintmanager.paintdirtyregions(unknown source)             @   javax.swing.repaintmanager.prepaintdirtyregions(unknown source)         @ javax.swing.repaintmanager.access$1000(unknown source)         @ javax.swing.repaintmanager$processingrunnable.run(unknown source)         @ java.awt.event.invocationevent.dispatch(unknown source)         @ java.awt.eventqueue.dispatcheventimpl(unknown source)         @ java.awt.eventqueue.access$200(unknown source)         @ java.awt.eventqueue$3.run(unknown source)         @ java.awt.eventqueue$3.run(unknown source)         @ java.security.accesscontroller.doprivileged(native method)         @ java.security.protectiondomain$1.dointersectionprivilege(unknown source)         @ java.awt.eventqueue.dispatchevent(unknown source)         @ java.awt.eventdispatchthread.pumponeeventforfilters(unknown source)         @ java.awt.eventdispatchthread.pumpeventsforfilter(unknown source)         @ java.awt.eventdispatchthread.pumpeventsforhierarchy(unknown source)         @ java.awt.eventdispatchthread.pumpevents(unknown source)         @ java.awt.eventdispatchthread.pumpevents(unknown source)         @ java.awt.eventdispatchthread.run(unknown source)


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