click 'design' - argument cannot be null

[pmoore]

I have a simpel form. I could edit it for a bit, now when I try to open it in the designer I get this popup.
Here is log

!MESSAGE Designer internal error: Argument cannot be null
!STACK 0
java.lang.IllegalArgumentException: Argument cannot be null
at org.eclipse.swt.SWT.error(SWT.java:2318)
at org.eclipse.swt.SWT.error(SWT.java:2262)
at org.eclipse.swt.widgets.Widget.error(Widget.java:385)
at org.eclipse.swt.widgets.Widget.checkParent(Widget.java:254)
at org.eclipse.swt.widgets.Widget.<init>(Widget.java:144)
at org.eclipse.swt.widgets.Control.<init>(Control.java:93)
at org.eclipse.swt.widgets.Scrollable.<init>(Scrollable.java:72)
at org.eclipse.swt.widgets.Composite.<init>(Composite.java:85)
at org.eclipse.swt.widgets.Table.<init>(Table.java:90)
at com.swtdesigner.model.widgets.controls.complex.h.a(Unknown Source)
at com.swtdesigner.model.widgets.controls.j.b(Unknown Source)
at com.swtdesigner.model.widgets.composites.d.b(Unknown Source)
at com.swtdesigner.model.widgets.composites.d.h(Unknown Source)
at com.swtdesigner.gef.m.a(Unknown Source)
at com.swtdesigner.gef.l.selectionChanged(Unknown Source)
at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:159)
at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1006)
at org.eclipse.core.runtime.Platform.run(Platform.java:413)
at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:157)
at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:1290)
at org.eclipse.jface.viewers.StructuredViewer.setSelection(StructuredViewer.java:1020)
at org.eclipse.jface.viewers.Viewer.setSelection(Viewer.java:362)
at com.swtdesigner.gef.m.a(Unknown Source)
at com.swtdesigner.editors.MultiPageEditor.d(Unknown Source)
at com.swtdesigner.editors.a.widgetSelected(Unknown Source)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:89)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:81)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:840)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:865)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:849)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:656)
at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:1744)
at org.eclipse.swt.custom.CTabFolder.onMouseDown(CTabFolder.java:1912)
at org.eclipse.swt.custom.CTabFolder.access$4(CTabFolder.java:1904)
at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:201)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:81)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:840)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:1838)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1545)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1402)
at org.eclipse.ui.internal.Workbench.run(Workbench.java:1385)
at org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoader.java:858)
at org.eclipse.core.boot.BootLoader.run(BootLoader.java:461)
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.basicRun(Main.java:291)
at org.eclipse.core.launcher.Main.run(Main.java:747)
at org.eclipse.core.launcher.Main.main(Main.java:583)

[asamoal]

Hello there strange you have just posted the message I had intended to post a while ago!(not more than 1hr !)

OK, I have noticed that one gets such errors when one puts or assosiates the wrong objects/control with certain parents. In my case whilst trying to create a popup control it attached itself to the menuitem control and that produced this error.

I hope that helps.

[admin]

I have a simpel form. I could edit it for a bit, now when I try to open it in the designer I get this popup.
Here is log

Please post source code of this form.

[cebarne2]

I also get this error. I believe the offending source code is for a combo box (in my case):

cmbsynplify.setItems( ToolPaths.propertyToArray(myProject.getPersistentProperty(new QualifiedName("VHDLDevelopmentTools", "SynplifyPaths"))));

Basically:

ToolPaths.propertyToArray(myProject.getPersistentProperty(new QualifiedName("VHDLDevelopmentTools", "SynplifyPaths")))

Will return a string array at runtime. Is the designer interpreting this as null?

Thanks,
Chad

[admin]

Thank you, Chad.
Once you published offending source code, this allows us to identify problem. We have bug in String[] parsing. If there is call for Combo.setItems() call, and call to method is used, code parser returns null as result, instead of empty string array. So, SWT complains that argument can not be null. I've fixed this bug, so in future version you will not receive it again. For now, try to move code for setting items to separate method.

[cebarne2]

Thank you for the quick turn-around on these questions and requests. Since using this tool, I have been very impressed by both its functionality, and your willingness to fix, enhance, or add functionality as reported by the user community.

I believe the recent acquisition by Instantiations is only further proof that I am not the only one impressed by SWT-Designer and its creator.

I will be recommending this tool to other Eclipse developers in our company as we continue our promotion and rollout of Eclipse to the Enterprise.