Today I discovered deadlock on linux when initializing fonts. I tried to run World Wind for Java demo applet.
I reported bug to bugs.sun.com. I don't think there will be fast response/fix. JConsole dealock stacktraces are in attachment. There are several problems. *) synchronization in "sun.java2d.SunGraphicsEnvironment.loadFonts(SunGraphicsEnvironment.java:425)- locked java.lang.str...@39ea58" against String that can be "intern" *) several lines above "loadFonts" is simple getter with description that same variable used for synchronization can be <null> - !!! synchronization can't be with null monitor !!! *) SunGraphicsEnvironment.loadFonts in synchonized block calls native sun.font.FontManager.getFontPath - that can lead to deadlock according to "Sun" information *) there is waiting awtLock on javawsApplicationMain and AWT-EventQueue-0 is trying to SunGraphicsEnvironment.loadFonts I hope that this help you fix this problem. Martin
Name: AWT-EventQueue-0 State: BLOCKED on java.lang.str...@39ea58 owned by: javawsApplicationMain Total blocked: 11 Total waited: 6 Stack trace: sun.java2d.SunGraphicsEnvironment.loadFonts(SunGraphicsEnvironment.java:419) sun.font.FontManager.findFont2D(FontManager.java:2125) java.awt.Font.getFont2D(Font.java:455) java.awt.Font.getNumGlyphs(Font.java:1699) com.sun.opengl.util.j2d.TextRenderer.<init>(TextRenderer.java:301) gov.nasa.worldwind.util.OGLTextRenderer.<init>(Unknown Source) gov.nasa.worldwind.util.OGLTextRenderer.getOrCreateTextRenderer(Unknown Source) gov.nasa.worldwind.util.OGLTextRenderer.getOrCreateTextRenderer(Unknown Source) gov.nasa.worldwind.layers.ScalebarLayer.drawLabel(Unknown Source) gov.nasa.worldwind.layers.ScalebarLayer.draw(Unknown Source) gov.nasa.worldwind.layers.ScalebarLayer$OrderedIcon.render(Unknown Source) gov.nasa.worldwind.AbstractSceneController.draw(Unknown Source) gov.nasa.worldwind.BasicSceneController.doRepaint(Unknown Source) gov.nasa.worldwind.AbstractSceneController.repaint(Unknown Source) gov.nasa.worldwind.WorldWindowGLAutoDrawable.doDisplay(Unknown Source) gov.nasa.worldwind.WorldWindowGLAutoDrawable.display(Unknown Source) com.sun.opengl.impl.GLDrawableHelper.display(GLDrawableHelper.java:78) javax.media.opengl.GLCanvas$DisplayAction.run(GLCanvas.java:435) com.sun.opengl.impl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:194) javax.media.opengl.GLCanvas.maybeDoSingleThreadedWorkaround(GLCanvas.java:412) javax.media.opengl.GLCanvas.display(GLCanvas.java:244) javax.media.opengl.GLCanvas.paint(GLCanvas.java:277) javax.media.opengl.GLCanvas.update(GLCanvas.java:354) sun.awt.RepaintArea.updateComponent(RepaintArea.java:239) sun.awt.X11.XRepaintArea.updateComponent(XRepaintArea.java:43) sun.awt.RepaintArea.paint(RepaintArea.java:216) sun.awt.X11.XComponentPeer.handleEvent(XComponentPeer.java:695) java.awt.Component.dispatchEventImpl(Component.java:4706) java.awt.Component.dispatchEvent(Component.java:4460) java.awt.EventQueue.dispatchEvent(EventQueue.java:599) 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) --- Name: javawsApplicationMain State: WAITING on java.util.concurrent.locks.reentrantlock$nonfairs...@e8c7db owned by: AWT-EventQueue-0 Total blocked: 2 Total waited: 3 Stack trace: sun.misc.Unsafe.park(Native Method) java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:747) java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:778) java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1114) java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:186) java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:262) sun.awt.SunToolkit.awtLock(SunToolkit.java:236) sun.font.FontManager.getFontPath(Native Method) - locked java.lang.cl...@18fa85 sun.java2d.SunGraphicsEnvironment.getPlatformFontPath(SunGraphicsEnvironment.java:385) sun.java2d.SunGraphicsEnvironment$3.run(SunGraphicsEnvironment.java:429) java.security.AccessController.doPrivileged(Native Method) sun.java2d.SunGraphicsEnvironment.loadFonts(SunGraphicsEnvironment.java:425) - locked java.lang.str...@39ea58 sun.font.FontManager.findFont2D(FontManager.java:2125) sun.font.FontManager.findFont2D(FontManager.java:1985) java.awt.Font.getFont2D(Font.java:455) java.awt.Font.getNumGlyphs(Font.java:1699) com.sun.opengl.util.j2d.TextRenderer.<init>(TextRenderer.java:301) com.sun.opengl.util.j2d.TextRenderer.<init>(TextRenderer.java:244) gov.nasa.worldwind.render.SurfaceText.getTextRenderer(Unknown Source) gov.nasa.worldwind.render.SurfaceText.updateTextBounds(Unknown Source) gov.nasa.worldwind.render.SurfaceText.setText(Unknown Source) gov.nasa.worldwind.render.SurfaceText.<init>(Unknown Source) gov.nasa.worldwind.examples.SurfaceObjects$AppFrame.buildShapesLayer(Unknown Source) gov.nasa.worldwind.examples.SurfaceObjects$AppFrame.<init>(Unknown Source) sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) java.lang.reflect.Constructor.newInstance(Constructor.java:513) java.lang.Class.newInstance0(Class.java:355) java.lang.Class.newInstance(Class.java:308) gov.nasa.worldwind.examples.ApplicationTemplate.start(Unknown Source) gov.nasa.worldwind.examples.SurfaceObjects.main(Unknown Source) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:597) com.sun.javaws.Launcher.executeApplication(Launcher.java:1748) com.sun.javaws.Launcher.executeMainClass(Launcher.java:1694) com.sun.javaws.Launcher.doLaunchApp(Launcher.java:1480) com.sun.javaws.Launcher.run(Launcher.java:130) java.lang.Thread.run(Thread.java:619)
