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https://issues.apache.org/jira/browse/NETBEANS-963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17032094#comment-17032094
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Ernie Rael commented on NETBEANS-963:
-------------------------------------
Note the initial description says "String Value" column. You choose this from
context menu (right click) when over a column header. It was happening every
time. For other reasons I cleaned out both the userdir and cachdir, now it's
not happening. If you keep the "String Value" column up, it will probably
happen sooner or later. I'll try to notice when it starts happening and provide
more info.
> java.lang.AssertionError: Debugger lock taken in AWT Event Queue!
> -----------------------------------------------------------------
>
> Key: NETBEANS-963
> URL: https://issues.apache.org/jira/browse/NETBEANS-963
> Project: NetBeans
> Issue Type: Bug
> Components: debugger - Java
> Affects Versions: 9.0
> Environment: Linux; Release Build 316
> Reporter: Peter Nabbefeld
> Assignee: ARUNAVA SINHA
> Priority: Critical
> Fix For: 9.0
>
> Attachments: issue.PNG
>
>
> When I've selected the "String Value" column in Variables view of the Java
> debugger, the following exception is thrown even if I just move the cursor
> over the string value.
> This does only happen for object values; primitive values do not seem to be
> affected.
> Probably it's related to tooltips, as those are shown for primitive values,
> while object values throw an exception.
> As this makes it impossible to show and review large strings and thus makes
> debugging harder, I've set the status to "Blocker".
>
> java.lang.AssertionError: Debugger lock taken in AWT Event Queue!
> at
> org.netbeans.modules.debugger.jpda.JPDADebuggerImpl$DebuggerReentrantReadWriteLock$DebuggerReadLock.lock(JPDADebuggerImpl.java:2675)
> at
> org.netbeans.modules.debugger.jpda.models.JPDAThreadImpl$ThreadReentrantReadWriteLock$ThreadWriteLock.lock(JPDAThreadImpl.java:2555)
> at
> org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.invokeMethod(JPDADebuggerImpl.java:1066)
> at
> org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.invokeMethod(JPDADebuggerImpl.java:1008)
> at
> org.netbeans.modules.debugger.jpda.models.AbstractObjectVariable.getToStringValue(AbstractObjectVariable.java:496)
> at
> org.netbeans.modules.debugger.jpda.models.AbstractObjectVariable.getToStringValue(AbstractObjectVariable.java:460)
> at
> org.netbeans.modules.debugger.jpda.models.AbstractObjectVariable.getToStringValue(AbstractObjectVariable.java:424)
> at
> org.netbeans.modules.debugger.jpda.ui.models.VariablesTableModel.getValueAt(VariablesTableModel.java:108)
> at
> org.netbeans.spi.viewmodel.Models$DelegatingTableModel.getValueAt(Models.java:2249)
> at
> org.netbeans.modules.debugger.jpda.ui.models.NumericDisplayFilter.getValueAt(NumericDisplayFilter.java:112)
> at
> org.netbeans.spi.viewmodel.Models$CompoundTableModel.getValueAt(Models.java:1439)
> at
> org.netbeans.modules.debugger.jpda.ui.models.VariablesTreeModelFilter.getValueAt(VariablesTreeModelFilter.java:530)
> at
> org.netbeans.spi.viewmodel.Models$CompoundTableModel.getValueAt(Models.java:1439)
> at
> org.netbeans.modules.debugger.jpda.ui.models.PendingActionsFilter.getValueAt(PendingActionsFilter.java:108)
> at
> org.netbeans.spi.viewmodel.Models$CompoundTableModel.getValueAt(Models.java:1439)
> at
> org.netbeans.spi.viewmodel.Models$CompoundTableModel.getValueAt(Models.java:1441)
> at
> org.netbeans.spi.viewmodel.Models$CompoundTableModel.getValueAt(Models.java:1441)
> at
> org.netbeans.spi.viewmodel.Models$CompoundModel.getValueAt(Models.java:4566)
> at
> org.netbeans.modules.viewmodel.TreeModelNode$MyProperty.updateShortDescription(TreeModelNode.java:2102)
> at
> org.netbeans.modules.viewmodel.TreeModelNode$MyProperty.getShortDescription(TreeModelNode.java:2084)
> at
> org.openide.explorer.view.SheetCell.getTableCellRendererComponent(SheetCell.java:276)
> at
> org.openide.explorer.view.SheetCell$OutlineSheetCell.getTableCellRendererComponent(SheetCell.java:737)
> at
> org.netbeans.modules.viewmodel.DelegatingCellRenderer.getTableCellRendererComponent(DelegatingCellRenderer.java:66)
> at java.desktop/javax.swing.JTable.prepareRenderer(JTable.java:5758)
> at org.netbeans.swing.outline.Outline.getToolTipText(Outline.java:393)
> at
> java.desktop/javax.swing.ToolTipManager$insideTimerAction.actionPerformed(ToolTipManager.java:675)
> at java.desktop/javax.swing.Timer.fireActionPerformed(Timer.java:317)
> at java.desktop/javax.swing.Timer$DoPostEvent.run(Timer.java:249)
> at
> java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
> at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764)
> at java.desktop/java.awt.EventQueue.access$500(EventQueue.java:97)
> at java.desktop/java.awt.EventQueue$3.run(EventQueue.java:717)
> at java.desktop/java.awt.EventQueue$3.run(EventQueue.java:711)
> at java.base/java.security.AccessController.doPrivileged(Native Method)
> at
> java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:89)
> at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:734)
> at
> org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:136)
> [catch] at
> java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:199)
> at
> java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
> at
> java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
> at
> java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
> at
> java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
> at
> java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
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