[jbosstools-issues] [JBoss JIRA] Commented: (JBIDE-6744) ArrayIndexOutOfBoundsException when opening a DSL Rule editor

ArrayIndexOutOfBoundsException when opening a DSL Rule editor ------------------------------------------------------------- Key: JBIDE-6744 URL: https://jira.jboss.org/browse/JBIDE-6744 Project: Tools (JBoss Tools) Issue Type: Bug Components: drools Affects Versions: 3.2.0.M2 Environment: - Windows XP - Eclipse Helios build 20100617-1415, SWT version 3.650 - JBoss Drools Core build 5.1.0.v20100728-2128-H133-M2 Reporter: András Péteri Assignee: Kris Verlaenen Fix For: 3.2.0.M2, 3.2.0.Beta Stack trace snippet: java.lang.ArrayIndexOutOfBoundsException: 1 at org.eclipse.swt.custom.StyledTextRenderer.calculateClientArea(StyledTextRenderer.java:230) at org.eclipse.swt.custom.StyledText.handleResize(StyledText.java:6165) at org.eclipse.swt.custom.StyledText$7.handleEvent(StyledText.java:5658) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1058) at org.eclipse.swt.widgets.Control.WM_SIZE(Control.java:4813) at org.eclipse.swt.widgets.Scrollable.WM_SIZE(Scrollable.java:291) at org.eclipse.swt.widgets.Composite.WM_SIZE(Composite.java:1653) at org.eclipse.swt.widgets.Canvas.WM_SIZE(Canvas.java:454) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4234) at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:341) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4873) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2454) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.WM_WINDOWPOSCHANGED(Control.java:4970) at org.eclipse.swt.widgets.Canvas.WM_WINDOWPOSCHANGED(Canvas.java:460) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4244) at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:341) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4873) at org.eclipse.swt.internal.win32.OS.SetWindowPos(Native Method) at org.eclipse.swt.widgets.Widget.SetWindowPos(Widget.java:1456) at org.eclipse.swt.widgets.Control.forceResize(Control.java:1018) at org.eclipse.swt.widgets.ScrollBar.getThumbTrackBounds(ScrollBar.java:464) at org.eclipse.jface.text.source.SourceViewer$RulerLayout.computeScrollArrowHeights(SourceViewer.java:217) at org.eclipse.jface.text.source.SourceViewer$RulerLayout.getVerticalScrollArrowHeights(SourceViewer.java:196) at org.eclipse.jface.text.source.SourceViewer$RulerLayout.layout(SourceViewer.java:155) at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1275) at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1261) at org.eclipse.swt.widgets.Composite.layout(Composite.java:664) at org.eclipse.swt.widgets.Composite.layout(Composite.java:622) at org.eclipse.jface.text.source.CompositeRuler.layoutTextViewer(CompositeRuler.java:611) at org.eclipse.jface.text.source.CompositeRuler.addDecorator(CompositeRuler.java:565) at org.eclipse.jface.text.source.projection.ProjectionViewer.addVerticalRulerColumn(ProjectionViewer.java:1289) at org.eclipse.jface.text.source.projection.ProjectionSupport.doEnableProjection(ProjectionSupport.java:310) at org.eclipse.jface.text.source.projection.ProjectionSupport$ProjectionListener.projectionEnabled(ProjectionSupport.java:143) at org.eclipse.jface.text.source.projection.ProjectionViewer.fireProjectionEnabled(ProjectionViewer.java:489) at org.eclipse.jface.text.source.projection.ProjectionViewer.enableProjection(ProjectionViewer.java:537) at org.eclipse.jface.text.source.projection.ProjectionViewer.doOperation(ProjectionViewer.java:1441) at org.drools.eclipse.editors.AbstractRuleEditor.createPartControl(Unknown Source) at org.eclipse.ui.part.MultiPageEditorPart.addPage(MultiPageEditorPart.java:241) at org.eclipse.ui.forms.editor.FormEditor.addPage(FormEditor.java:325) at org.eclipse.ui.part.MultiPageEditorPart.addPage(MultiPageEditorPart.java:211) at org.eclipse.ui.forms.editor.FormEditor.addPage(FormEditor.java:308) at org.drools.eclipse.dsl.editor.DSLRuleEditor2.addPages(Unknown Source) at org.eclipse.ui.forms.editor.FormEditor.createPages(FormEditor.java:138) at org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:348) The issue seems to be platform-dependent, as I'm not getting any exceptions in a gtk.linux.x86 build. Some debugging revealed that StyledTextRenderer's internal data structures assume a different number of lines present than what content.getLineCount() returns in calculateClientArea(); these two values are usually kept in sync with the use of TextChangeListeners. I think that because of TransformedDocument's lazy update mechanism, new state can be returned to the renderer without firing a corresponding text change event first.