matthiasblaesing opened a new pull request, #5877:
URL: https://github.com/apache/netbeans/pull/5877
While running NetBeans with assertions enabled, while tryping to open the
detail/value dialog for the "String value", an AssertionError was observed.
```
java.lang.AssertionError: Debugger lock taken in AWT Event Queue!
at
org.netbeans.modules.debugger.jpda.JPDADebuggerImpl$DebuggerReentrantReadWriteLock$DebuggerReadLock.lock(JPDADebuggerImpl.java:2710)
at
org.netbeans.modules.debugger.jpda.models.JPDAThreadImpl$ThreadReentrantReadWriteLock$ThreadWriteLock.lock(JPDAThreadImpl.java:2581)
at
org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.invokeMethod(JPDADebuggerImpl.java:1080)
at
org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.invokeMethod(JPDADebuggerImpl.java:1022)
at
org.netbeans.modules.debugger.jpda.models.AbstractObjectVariable.getToStringValue(AbstractObjectVariable.java:500)
at
org.netbeans.modules.debugger.jpda.models.AbstractObjectVariable.getToStringValue(AbstractObjectVariable.java:464)
at
org.netbeans.modules.debugger.jpda.models.AbstractObjectVariable.getToStringValue(AbstractObjectVariable.java:428)
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$CompoundTableModel.getValueAt(Models.java:1439)
at
org.netbeans.modules.debugger.jpda.ui.models.EvaluatorTableModelFilter.getValueAt(EvaluatorTableModelFilter.java:71)
at
org.netbeans.spi.viewmodel.Models$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$CompoundModel.getValueAt(Models.java:4565)
at
org.netbeans.modules.viewmodel.TreeModelNode$MyProperty.updateShortDescription(TreeModelNode.java:2094)
at
org.netbeans.modules.viewmodel.TreeModelNode$MyProperty.getShortDescription(TreeModelNode.java:2076)
at
org.openide.explorer.propertysheet.CustomEditorAction.actionPerformed(CustomEditorAction.java:290)
at
org.openide.explorer.propertysheet.PropertyPanel$CustomEditorProxyAction.actionPerformed(PropertyPanel.java:1199)
at
org.openide.explorer.view.OutlineView$OutlineViewOutline.editCellAt(OutlineView.java:2115)
at
java.desktop/javax.swing.plaf.basic.BasicTableUI$Handler.adjustSelection(BasicTableUI.java:1147)
at
java.desktop/javax.swing.plaf.basic.BasicTableUI$Handler.mousePressed(BasicTableUI.java:1077)
```
Indeed here the call comes from the EDT and directly tries to access the
JPDA connection.
The fix is inspired from JPDAAsynchronousModel and moves value fetching from
the EDT to the JPDA thread.
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