This error keeps happening when I compile my form application. It has worked
before, but the only thing I have done differently is include a NB splitpane
bean with a nested splitpane. 

Hi, thanks for report. Could you please try it again? To be sure it happens
consistently. I.e. open the form (it did not save due the exception anyway) and
do the same thing. We need a reproducible test case, the exception is
unfortunately not enough in this case.

Could you possibly also attach the form (both .form file and .java file) so we
could try it as well? Thanks

I am also consistenly getting this error when trying to add an actionListener to
a JButton.

I get this too. It was when moving two components into a JSplitPane.

Cheers,
Mikael Grev

I get another NPE as well. The two feels related:

*********** Exception occurred ************ at 8:41 PM on Mar 28, 2006
java.lang.NullPointerException
	at
org.netbeans.modules.form.JavaCodeGenerator.generateComponentCreate(JavaCodeGenerator.java:1115)
	at
org.netbeans.modules.form.JavaCodeGenerator.addCreateCode(JavaCodeGenerator.java:993)
	at
org.netbeans.modules.form.JavaCodeGenerator.addCreateCode(JavaCodeGenerator.java:998)
	at
org.netbeans.modules.form.JavaCodeGenerator.regenerateInitComponents(JavaCodeGenerator.java:815)
	at
org.netbeans.modules.form.JavaCodeGenerator.regenerateCode(JavaCodeGenerator.java:2548)
	at
org.netbeans.modules.form.JavaCodeGenerator$FormListener.formChanged(JavaCodeGenerator.java:2806)
	at org.netbeans.modules.form.FormModel.fireEvents(FormModel.java:979)
	at org.netbeans.modules.form.FormModel.sendEventImmediately(FormModel.java:1007)
	at org.netbeans.modules.form.FormModel.fireFormToBeSaved(FormModel.java:694)
	at org.netbeans.modules.form.FormEditor.saveFormData(FormEditor.java:273)
	at
org.netbeans.modules.form.FormEditorSupport.saveDocument(FormEditorSupport.java:215)
	at org.netbeans.modules.java.JavaEditor$Save.save(JavaEditor.java:236)
	at org.netbeans.core.NbTopManager.saveAll(NbTopManager.java:261)
	at org.netbeans.core.NbTopManager.access$300(NbTopManager.java:63)
	at org.netbeans.core.NbTopManager$NbLifecycleManager.saveAll(NbTopManager.java:421)
	at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:213)
[catch] at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:125)
*********** Exception occurred ************ at 8:43 PM on Mar 28, 2006
java.lang.NullPointerException
	at
org.netbeans.modules.form.codestructure.DefaultCodeExpression$UsedObjectsIterator.<init>(DefaultCodeExpression.java:235)
	at
org.netbeans.modules.form.codestructure.DefaultCodeExpression.getUsedObjectsIterator(DefaultCodeExpression.java:203)
	at
org.netbeans.modules.form.codestructure.CodeStructure.unregisterUsingCodeObject(CodeStructure.java:321)
	at
org.netbeans.modules.form.codestructure.CodeStructure.unregisterUsingCodeObject(CodeStructure.java:327)
	at
org.netbeans.modules.form.codestructure.CodeStructure.removeStatements(CodeStructure.java:193)
	at
org.netbeans.modules.form.layoutsupport.LayoutSupportManager.removeComponent(LayoutSupportManager.java:502)
	at org.netbeans.modules.form.RADVisualContainer.remove(RADVisualContainer.java:313)
	at org.netbeans.modules.form.FormModel.removeComponentImpl(FormModel.java:453)
	at org.netbeans.modules.form.FormModel.removeComponent(FormModel.java:432)
	at org.netbeans.modules.form.RADComponentNode.destroy(RADComponentNode.java:286)
	at
org.netbeans.modules.form.ComponentInspector$DeleteActionPerformer.doDelete(ComponentInspector.java:521)
	at
org.netbeans.modules.form.ComponentInspector$DeleteActionPerformer.run(ComponentInspector.java:513)
	at org.openide.util.Mutex$1.run(Mutex.java:1188)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
	at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
	at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
[catch] at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

I got a very similar NPE. It happened when I pressed the "Save All" button.

java.lang.NullPointerException
        at 
org.netbeans.modules.form.JavaCodeGenerator.generateComponentCreate(JavaCodeGenerator.java:1115)
        at 
org.netbeans.modules.form.JavaCodeGenerator.addCreateCode(JavaCodeGenerator.java:993)
        at 
org.netbeans.modules.form.JavaCodeGenerator.addCreateCode(JavaCodeGenerator.java:998)
        at 
org.netbeans.modules.form.JavaCodeGenerator.addCreateCode(JavaCodeGenerator.java:998)
        at 
org.netbeans.modules.form.JavaCodeGenerator.addCreateCode(JavaCodeGenerator.java:998)
        at 
org.netbeans.modules.form.JavaCodeGenerator.addCreateCode(JavaCodeGenerator.java:998)
        at 
org.netbeans.modules.form.JavaCodeGenerator.addCreateCode(JavaCodeGenerator.java:998)
        at 
org.netbeans.modules.form.JavaCodeGenerator.addCreateCode(JavaCodeGenerator.java:998)
        at 
org.netbeans.modules.form.JavaCodeGenerator.regenerateInitComponents(JavaCodeGenerator.java:815)
        at 
org.netbeans.modules.form.JavaCodeGenerator.regenerateCode(JavaCodeGenerator.java:2548)
        at 
org.netbeans.modules.form.JavaCodeGenerator$FormListener.formChanged(JavaCodeGenerator.java:2806)
        at org.netbeans.modules.form.FormModel.fireEvents(FormModel.java:979)
        at 
org.netbeans.modules.form.FormModel.sendEventImmediately(FormModel.java:1007)
        at 
org.netbeans.modules.form.FormModel.fireFormToBeSaved(FormModel.java:694)
        at 
org.netbeans.modules.form.FormEditor.saveFormData(FormEditor.java:273)
        at 
org.netbeans.modules.form.FormEditorSupport.saveDocument(FormEditorSupport.java:215)
        at org.netbeans.modules.java.JavaEditor$Save.save(JavaEditor.java:236)
        at org.netbeans.core.NbTopManager.saveAll(NbTopManager.java:261)
        at org.netbeans.core.NbTopManager.access$300(NbTopManager.java:63)
        at 
org.netbeans.core.NbTopManager$NbLifecycleManager.saveAll(NbTopManager.java:421)
        at 
org.openide.actions.SaveAllAction.performAction(SaveAllAction.java:78)
        at 
org.openide.util.actions.CallableSystemAction$1.run(CallableSystemAction.java:94)
        at 
org.netbeans.modules.openide.util.ActionsBridge$ActionRunnable.actionPerformed(ActionsBridge.java:81)
        at org.netbeans.core.ModuleActions.invokeAction(ModuleActions.java:74)
        at 
org.netbeans.modules.openide.actions.ActionsBridgeImpl.invokeAction(ActionsBridgeImpl.java:24)
        at 
org.netbeans.modules.openide.util.ActionsBridge$ActionRunnable.doRun(ActionsBridge.java:72)
        at 
org.netbeans.modules.openide.util.ActionsBridge$1.run(ActionsBridge.java:41)
        at 
org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:493)
[catch] at 
org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:926)

Hopefully this problem was fixed with issue 77092.

*** This issue has been marked as a duplicate of 77092 ***

*** Issue 79765 has been marked as a duplicate of this issue. ***