swing - Java and Windows Look & feel -

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i made swing application scans images; , each image represented leaf tree

the problem faced throws exception 

exception in thread "awt-eventqueue-0" java.lang.nullpointerexception     @ com.sun.java.swing.plaf.windows.xpstyle$skin.getwidth(xpstyle.java:513)     @ com.sun.java.swing.plaf.windows.xpstyle$skin.getwidth(xpstyle.java:517)     @ com.sun.java.swing.plaf.windows.windowstreeui$expandedicon.geticonwidth(windowstreeui.java:138)     @ javax.swing.plaf.basic.basictreeui.drawcentered(basictreeui.java:1580)     @ javax.swing.plaf.basic.basictreeui.paintexpandcontrol(basictreeui.java:1464)     @ javax.swing.plaf.basic.basictreeui.paint(basictreeui.java:1206)     @ javax.swing.plaf.componentui.update(componentui.java:143)     @ javax.swing.jcomponent.paintcomponent(jcomponent.java:763)     @ javax.swing.jcomponent.paint(jcomponent.java:1027)     @ javax.swing.jcomponent.painttooffscreen(jcomponent.java:5122)     @ javax.swing.bufferstrategypaintmanager.paint(bufferstrategypaintmanager.java:285)     @ javax.swing.repaintmanager.paint(repaintmanager.java:1128)     @ javax.swing.jcomponent._paintimmediately(jcomponent.java:5070)     @ javax.swing.jcomponent.paintimmediately(jcomponent.java:4880)     @ javax.swing.repaintmanager.paintdirtyregions(repaintmanager.java:723)     @ javax.swing.repaintmanager.paintdirtyregions(repaintmanager.java:679)     @ javax.swing.repaintmanager.seqpaintdirtyregions(repaintmanager.java:659)     @ javax.swing.systemeventqueueutilities$componentworkrequest.run(systemeventqueueutilities.java:128)     @ java.awt.event.invocationevent.dispatch(invocationevent.java:209)     @ java.awt.eventqueue.dispatchevent(eventqueue.java:597)     @ java.awt.eventdispatchthread.pumponeeventforfilters(eventdispatchthread.java:273)     @ java.awt.eventdispatchthread.pumpeventsforfilter(eventdispatchthread.java:183)     @ java.awt.eventdispatchthread.pumpeventsforhierarchy(eventdispatchthread.java:173)     @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:168)     @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:160)     @ java.awt.eventdispatchthread.run(eventdispatchthread.java:121)

and don't know why appears note: using windows , feel

uimanager.setlookandfeel("com.sun.java.swing.plaf.windows.windowslookandfeel");

and java 1.6_22 under windows-7

try this:

//set , feel users os laf.     try {         uimanager.setlookandfeel(uimanager.getsystemlookandfeelclassname());     } catch (classnotfoundexception e) {         e.printstacktrace();     } catch (instantiationexception e) {         e.printstacktrace();     } catch (illegalaccessexception e) {         e.printstacktrace();     } catch (unsupportedlookandfeelexception e) {         e.printstacktrace();     }

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