i trying convert icon (javax.swing.icon) image (java.awt.image) using code :
private image icontoimage(icon icon) { if(icon instanceof imageicon) { return ((imageicon) icon).getimage(); } else { bufferedimage image = new bufferedimage(icon.geticonwidth(), icon.geticonheight(), bufferedimage.type_int_rgb); icon.painticon(null, image.getgraphics(), 0, 0); return image; } } the thing is, painticon function throws me nullpointerexception on image.getgraphics().
for record, icon value default checkbox icon (obtained via uimanager.geticon("checkbox.icon"))
here's details of exception thrown :
exception in thread "awt-eventqueue-0" java.lang.nullpointerexception @ com.sun.java.swing.plaf.windows.windowsiconfactory$checkboxicon.painticon(windowsiconfactory.java:306) @ utils.warningrenderer.icontoimage(warningrenderer.java:50) @ utils.warningrenderer.<init>(warningrenderer.java:38) @ deliveryexpress.deliveryexpressview.setwarnings(deliveryexpressview.java:278) @ deliveryexpress.deliveryexpressview.updatelists(deliveryexpressview.java:218) @ deliveryexpress.deliveryexpressview.access$1100(deliveryexpressview.java:47) @ deliveryexpress.deliveryexpressview$5.addcheck(deliveryexpressview.java:183) @ org.japura.gui.model.defaultlistcheckmodel.firechecklistmodellisteners(unknown source) @ org.japura.gui.model.defaultlistcheckmodel.fireaddchecklistmodellisteners(unknown source) @ org.japura.gui.model.defaultlistcheckmodel.addcheck(unknown source) @ org.japura.gui.checklist$1.mouseclicked(unknown source) @ java.awt.awteventmulticaster.mouseclicked(awteventmulticaster.java:253) @ java.awt.component.processmouseevent(component.java:6292) @ javax.swing.jcomponent.processmouseevent(jcomponent.java:3267) @ java.awt.component.processevent(component.java:6054) @ java.awt.container.processevent(container.java:2041) @ java.awt.component.dispatcheventimpl(component.java:4652) @ java.awt.container.dispatcheventimpl(container.java:2099) @ java.awt.component.dispatchevent(component.java:4482) @ java.awt.lightweightdispatcher.retargetmouseevent(container.java:4577) @ java.awt.lightweightdispatcher.processmouseevent(container.java:4247) @ java.awt.lightweightdispatcher.dispatchevent(container.java:4168) @ java.awt.container.dispatcheventimpl(container.java:2085) @ java.awt.window.dispatcheventimpl(window.java:2478) @ java.awt.component.dispatchevent(component.java:4482) @ java.awt.eventqueue.dispatcheventimpl(eventqueue.java:644) @ java.awt.eventqueue.access$000(eventqueue.java:85) @ java.awt.eventqueue$1.run(eventqueue.java:603) @ java.awt.eventqueue$1.run(eventqueue.java:601) @ java.security.accesscontroller.doprivileged(native method) @ java.security.accesscontrolcontext$1.dointersectionprivilege(accesscontrolcontext.java:87) @ java.security.accesscontrolcontext$1.dointersectionprivilege(accesscontrolcontext.java:98) @ java.awt.eventqueue$2.run(eventqueue.java:617) @ java.awt.eventqueue$2.run(eventqueue.java:615) @ java.security.accesscontroller.doprivileged(native method) @ java.security.accesscontrolcontext$1.dointersectionprivilege(accesscontrolcontext.java:87) @ java.awt.eventqueue.dispatchevent(eventqueue.java:614) @ java.awt.eventdispatchthread.pumponeeventforfilters(eventdispatchthread.java:269) @ java.awt.eventdispatchthread.pumpeventsforfilter(eventdispatchthread.java:184) @ java.awt.eventdispatchthread.pumpeventsforhierarchy(eventdispatchthread.java:174) @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:169) @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:161) @ java.awt.eventdispatchthread.run(eventdispatchthread.java:122) if need more details, tell me, i'll edit post add them.
thanks !
just found code snippet might if want wrap misbehaving laf provided icons more often:
/** * ui-icons misbehave in unconditionally class-cast * component type painted on. consequently blow if * trying paint them anywhere else (f.i. in renderer). * * icon adaption of cool trick darryl burke/rob camick found @ * http://tips4java.wordpress.com/2008/12/18/icon-table-cell-renderer/#comment-120 * * base idea instantiate component of type expected icon, * let paint graphics of bufferedimage , create imageicon it. * in subsequent calls imageicon used. * */ public static class safeicon implements icon { private icon wrappee; private icon standin; public safeicon(icon wrappee) { this.wrappee = wrappee; } @override public int geticonheight() { return wrappee.geticonheight(); } @override public int geticonwidth() { return wrappee.geticonwidth(); } @override public void painticon(component c, graphics g, int x, int y) { if (standin == this) { paintfallback(c, g, x, y); } else if (standin != null) { standin.painticon(c, g, x, y); } else { try { wrappee.painticon(c, g, x, y); } catch (classcastexception e) { createstandin(e, x, y); standin.painticon(c, g, x, y); } } } /** * @param e */ private void createstandin(classcastexception e, int x, int y) { try { class<?> clazz = getclass(e); jcomponent standincomponent = getsubstitute(clazz); standin = createimageicon(standincomponent, x, y); } catch (exception e1) { // went wrong - fallback painting standin = this; } } private icon createimageicon(jcomponent standincomponent, int x, int y) { bufferedimage image = new bufferedimage(geticonwidth(), geticonheight(), bufferedimage.type_int_argb); graphics g = image.creategraphics(); try { wrappee.painticon(standincomponent, g, 0, 0); return new imageicon(image); } { g.dispose(); } } /** * @param clazz * @throws illegalaccessexception */ private jcomponent getsubstitute(class<?> clazz) throws illegalaccessexception { jcomponent standincomponent; try { standincomponent = (jcomponent) clazz.newinstance(); } catch (instantiationexception e) { standincomponent = new abstractbutton() { }; ((abstractbutton) standincomponent).setmodel(new defaultbuttonmodel()); } return standincomponent; } private class<?> getclass(classcastexception e) throws classnotfoundexception { string classname = e.getmessage(); classname = classname.substring(classname.lastindexof(" ") + 1); return class.forname(classname); } private void paintfallback(component c, graphics g, int x, int y) { g.drawrect(x, y, geticonwidth(), geticonheight()); g.drawline(x, y, x + geticonwidth(), y + geticonheight()); g.drawline(x + geticonwidth(), y, x, y + geticonheight()); } } to use in snippet, pass in arbitrary component:
icon = new safeicon(icon); bufferedimage image = new bufferedimage(icon.geticonwidth(), icon.geticonheight(), bufferedimage.type_int_rgb); icon.painticon(new jpanel(), image.getgraphics(), 0, 0); 
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