[news.eclipse.tools.ve] Re: Another NPE and VE won't display my composit

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[news.eclipse.tools.ve] Re: Another NPE and VE won't display my composite after some simple source editing.

From: Peter Walker <walkerp@xxxxxxxxxx>
Date: Mon, 08 Aug 2005 16:38:57 -0400
Newsgroups: eclipse.tools.ve
Organization: EclipseCorner
User-agent: Mozilla Thunderbird 1.0.5 (Windows/20050711)

Joel, I opened bug 106404 to track this problem Please add yourself to the CC list if you want to follow the report --> https://bugs.eclipse.org/bugs/show_bug.cgi?id=106404

Regards...
Peter Walker
VE Development

Joel Kamentz wrote:

Ok.  Simple steps.
Create a new workspace. Set editor preferences to show line numbers. Create a new plugin project named Test. Keep all defaults, but do not use a template. In the test package, create a new visual class SWT->Composite named C. Display palette and java bean views. Drop a CLabel in upper left (use default field name). Drop a Scale somewhere below it (use default field name). Add a selection event handler to the Scale (via popup menu from visuals display). delete line 21: cLabel.setText("CLabel"); now, between lines 28 and 29: 28: }); 29: setSize(new Point(300, 200));
create a new line 29: cLabel.setText("CLabel " + scale.getSelection());
Save source file (using control-S).
Pause and unpause VE (using toolbar).  Get NPE.
entire C.java:
package test;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Scale;
public class C extends Composite {
 private CLabel cLabel = null;
 private Scale scale = null;
 public C(Composite parent, int style) {
  super(parent, style);
  initialize();
 }
private void initialize() { cLabel = new CLabel(this, SWT.NONE); cLabel.setBounds(new org.eclipse.swt.graphics.Rectangle(29,30,38,19)); scale = new Scale(this, SWT.NONE); scale.setBounds(new org.eclipse.swt.graphics.Rectangle(75,106,170,42)); scale.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() { public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) { System.out.println("widgetSelected()"); // TODO Auto-generated Event stub widgetSelected() } }); cLabel.setText("CLabel " + scale.getSelection()); setSize(new Point(300, 200)); }
}
.log file contains: !SESSION 2005-08-01 13:50:19.816 ----------------------------------------------- eclipse.buildId=I20050627-1435 java.version=1.5.0_04 java.vendor=Sun Microsystems Inc. BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US Framework arguments: -showlocation Command-line arguments: -os win32 -ws win32 -arch x86 -showlocation

!ENTRY org.eclipse.ve.java.core 4 0 2005-08-01 13:55:10.201 !MESSAGE Exception thrown. !STACK 0 java.lang.NullPointerException at org.eclipse.ve.internal.swt.CompositeGraphicalEditPart.setupControl(CompositeGraphicalEditPart.java:96) at org.eclipse.ve.internal.swt.CompositeGraphicalEditPart.createChild(CompositeGraphicalEditPart.java:84) at org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:733) at org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:684) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:554) at org.eclipse.gef.editparts.AbstractEditPart.addNotify(AbstractEditPart.java:232) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addNotify(AbstractGraphicalEditPart.java:212) at org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:195) at org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:734) at org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:684) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:554) at org.eclipse.ve.internal.java.codegen.editorpart.JavaVisualEditorPart.setRootModel(JavaVisualEditorPart.java:506) at org.eclipse.ve.internal.java.codegen.editorpart.JavaVisualEditorPart.initializeViewers(JavaVisualEditorPart.java:987) at org.eclipse.ve.internal.java.codegen.editorpart.JavaVisualEditorPart$12.run(JavaVisualEditorPart.java:1977) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3057) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2716) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:367) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:103) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334) at org.eclipse.core.launcher.Main.basicRun(Main.java:278) at org.eclipse.core.launcher.Main.run(Main.java:973) at org.eclipse.core.launcher.Main.main(Main.java:948)
!ENTRY org.eclipse.ui 4 4 2005-08-01 13:55:10.217
!MESSAGE Unhandled event loop exception
!ENTRY org.eclipse.ui 4 0 2005-08-01 13:55:10.217 !MESSAGE Failed to execute runnable (java.lang.NullPointerException) !STACK 0 org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.NullPointerException) at org.eclipse.swt.SWT.error(SWT.java:2942) at org.eclipse.swt.SWT.error(SWT.java:2865) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:126) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3057) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2716) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:367) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:103) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334) at org.eclipse.core.launcher.Main.basicRun(Main.java:278) at org.eclipse.core.launcher.Main.run(Main.java:973) at org.eclipse.core.launcher.Main.main(Main.java:948) Caused by: java.lang.NullPointerException at org.eclipse.ve.internal.swt.CompositeGraphicalEditPart.setupControl(CompositeGraphicalEditPart.java:96) at org.eclipse.ve.internal.swt.CompositeGraphicalEditPart.createChild(CompositeGraphicalEditPart.java:84) at org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:733) at org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:684) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:554) at org.eclipse.gef.editparts.AbstractEditPart.addNotify(AbstractEditPart.java:232) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addNotify(AbstractGraphicalEditPart.java:212) at org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:195) at org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:734) at org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:684) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:554) at org.eclipse.ve.internal.java.codegen.editorpart.JavaVisualEditorPart.setRootModel(JavaVisualEditorPart.java:506) at org.eclipse.ve.internal.java.codegen.editorpart.JavaVisualEditorPart.initializeViewers(JavaVisualEditorPart.java:987) at org.eclipse.ve.internal.java.codegen.editorpart.JavaVisualEditorPart$12.run(JavaVisualEditorPart.java:1977) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123) ... 18 more
"Joe Winchester" <winchest@xxxxxxxxxx> wrote in message news:dcl5u7$lhg$1@xxxxxxxxxxxxxxxxxxx
Hi Joel,
From your description I have tried to re-create the error you got but don't have enough information for me to encounter it. Could you please post an idiot proof description of how to get the error, e.g.

1 - Open file foo.java 2 - select the lines 30 to 40. Cut and paste these so they are at line 20. 3 - Close the editor. 4 - Clean the project 5 - Re-open and see the VE crash.

Also post the full source code of the file(s) in error. Don't include that much narrative of why you are doing what you are doing with moving the code around. To create a bug report all we need is a set of re-creatable steps from a standing start where we can make it crash and then see what's wrong. If it crashes it's a bug.

By the way - there are two bits of parsing that go on with the VE when you edit source code. One occurs each time you change the source and is a snippit reload that tries to do intelligent delta on what has changed into the model. If this can't do its job (which sometimes legitimately occurs if the sippit analyzer realizes the changes made are too big to delta in) then a full reload occurs. You can trigger this at any time by pushing the pause button at the top and then unpausing. Each time the VE closes a file and re-opens it we used to always re-parse from scratch the source, however now we have a cache that holds information that helps performance. This cache is what is cleared by doing a Project>Clean.
Best regards,
Joe Winchester

References:
- [news.eclipse.tools.ve] Another NPE and VE won't display my composite after some simple source editing.
  - From: Joel Kamentz
- [news.eclipse.tools.ve] Re: Another NPE and VE won't display my composite after some simple source editing.
  - From: Joe Winchester
- [news.eclipse.tools.ve] Re: Another NPE and VE won't display my composite after some simple source editing.
  - From: Joel Kamentz

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