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copied!<p>It might be worth trying a deadlock detecting bit of code - <a href="http://www.javaspecialists.co.za/archive/newsletter.do?issue=093" rel="nofollow noreferrer">like this</a>.</p> <p>The stopQuery lock does not seem to have acquired the lock previously in the stack trace, but then that lock does not seem to have acquired anywhere else either - weird...</p> <pre><code>"Worker-2" prio=10 tid=0x00002aad1da66400 nid=0x5165 waiting for monitor entry [0x0000000041b43000..0x0000000041b43b90] java.lang.Thread.State: BLOCKED (on object monitor) at org.eclipse.jdt.internal.core.index.DiskIndex.stopQuery(DiskIndex.java) - waiting to lock <0x00002aacdfe83ea8> (a org.eclipse.jdt.internal.core.index.DiskIndex) at org.eclipse.jdt.internal.core.index.Index.stopQuery(Index.java:192) </code></pre> <p>There is a wait on a held lock in this bit, but thats released the lock until it gets a notify/timeout:</p> <pre><code>"Text Viewer Hover Presenter" daemon prio=10 tid=0x00002aad20166400 nid=0x51f4 in Object.wait() [0x000000004254c000..0x000000004254dd90] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00002aace2276720> (a java.lang.Object) at java.lang.Object.wait(Object.java:485) at org.eclipse.jdt.internal.ui.javaeditor.ASTProvider.getAST(ASTProvider.java:450) - locked <0x00002aace2276720> (a java.lang.Object) at org.eclipse.jdt.ui.SharedASTProvider.getAST(SharedASTProvider.java:129) at org.eclipse.jdt.internal.ui.text.java.hover.NLSStringHover.getHoverInfo(NLSStringHover.java:87) at org.eclipse.jdt.internal.ui.text.java.hover.AbstractJavaEditorTextHover.getHoverInfo2(AbstractJavaEditorTextHover.java:86) at org.eclipse.jdt.internal.ui.text.java.hover.BestMatchHover.getHoverInfo2(BestMatchHover.java:129) at org.eclipse.jdt.internal.ui.text.java.hover.JavaEditorTextHoverProxy.getHoverInfo2(JavaEditorTextHoverProxy.java:82) at org.eclipse.jface.text.TextViewerHoverManager$4.run(TextViewerHoverManager.java:166) </code></pre>

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