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POMultiple Event Dispatch Threads causing deadlock in Java Web Start app
 

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  1. POMultiple Event Dispatch Threads causing deadlock in Java Web Start app
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    <p>I am writing a Java Web Start application and I have observed it freezing. When I do a thread dump, I can see the two threads involved in the deadlock are both Event Dispatch Threads.</p> <p>When I run the app locally, there is only one EDT, but when I download and run through Java Web Start, there is a second one.</p> <p>Can someone tell me why there is a second EDT, and how can I prevent them deadlocking with each other?</p> <p>edit: After monitoring the app using JVisualVM, I believe that the second EDT is responsible for redrawing the java console window.</p> <pre><code>Found one Java-level deadlock: ============================= "AWT-EventQueue-1": waiting to lock monitor 0x07e4d8fc (object 0x29c2d950, a java.awt.Component$AWTTreeLock), which is held by "AWT-EventQueue-0" "AWT-EventQueue-0": waiting to lock monitor 0x07e4cbfc (object 0x29c294e8, a java.lang.StringBuilder), which is held by "AWT-EventQueue-1" Java stack information for the threads listed above: =================================================== "AWT-EventQueue-1": at java.awt.Window.getOpacity(Unknown Source) - waiting to lock &lt;0x29c2d950&gt; (a java.awt.Component$AWTTreeLock) at sun.awt.SunToolkit.isContainingTopLevelTranslucent(Unknown Source) at sun.awt.windows.WComponentPeer.isAccelCapable(Unknown Source) at sun.java2d.d3d.D3DSurfaceData$D3DWindowSurfaceData.restoreSurface(Unknown Source) at sun.java2d.d3d.D3DScreenUpdateManager.validate(Unknown Source) at sun.java2d.d3d.D3DScreenUpdateManager.createGraphics(Unknown Source) at sun.awt.windows.WComponentPeer.getGraphics(Unknown Source) at java.awt.Component.getGraphics(Unknown Source) at javax.swing.JFrame.getGraphics(Unknown Source) at javax.swing.JComponent.safelyGetGraphics(Unknown Source) - locked &lt;0x29c294e8&gt; (a java.lang.StringBuilder) at javax.swing.RepaintManager$3.run(Unknown Source) ... at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) "AWT-EventQueue-0": at javax.swing.JComponent.isComponentObtainingGraphicsFrom(Unknown Source) - waiting to lock &lt;0x29c294e8&gt; (a java.lang.StringBuilder) at javax.swing.JComponent.getGraphicsInvoked(Unknown Source) at javax.swing.JFrame.getGraphics(Unknown Source) ... at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) </code></pre>
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    1. COCould it be: http://stackoverflow.com/questions/9795385/threading-and-deadlock-in-swing-application
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    2. CONo. I am not creating my own EDT if that's what you're asking @assylias
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