This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.

Bug 129877

Summary:	NullPointerException at org.netbeans.modules.form.FormDesigner$3.propertyChange
Product:	guibuilder	Reporter:	novakm <novakm>
Component:	Code	Assignee:	issues@guibuilder <issues>
Status:	VERIFIED FIXED
Severity:	blocker
Priority:	P3
Version:	6.x
Hardware:	All
OS:	All
URL:	http://statistics.netbeans.org/exceptions/detail.do?id=11277
Issue Type:	DEFECT	Exception Reporter:	11277
Attachments:	stacktrace stacktrace

Description novakm 2008-03-12 10:51:31 UTC

Build: NetBeans IDE Dev (Build 200803111205)
VM: Java HotSpot(TM) Client VM, 10.0-b19
OS: Windows Vista, 6.0, x86

User Comments: 
I was just closing several tabs in editor area. The last tab was one JFrame with only one button in it. After I closed it, NPE was thrown

Comment 1 novakm 2008-03-12 10:51:35 UTC

Created attachment 58216 [details]
stacktrace

Comment 2 novakm 2008-03-12 11:06:14 UTC

I just got the same exception when writing some code and using code completion for an action for that one button.

Comment 3 Marian Petras 2008-03-12 11:30:47 UTC

Build: NetBeans IDE Dev (Build 080311)
VM: Java HotSpot(TM) Client VM, 11.0-b11
OS: Linux, 2.6.22-14-generic, i386

User Comments: 
I closed a Java editor coupled with a form editor (but the source editor was active).

Comment 4 Marian Petras 2008-03-12 11:30:50 UTC

Created attachment 58218 [details]
stacktrace

Comment 5 Jana Maleckova 2008-03-12 11:45:06 UTC

StackTrace:
===========
java.lang.NullPointerException
        at org.netbeans.modules.form.FormDesigner$3.propertyChange(FormDesigner.java:264)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:347)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
        at java.awt.Component.firePropertyChange(Component.java:7926)

Comment 6 Jan Stola 2008-03-12 11:58:03 UTC

I was not able to reproduce this issue, but it seems to be a race-condition during closing of form. Probably an attempt 
for lazy synchronization of already closed form.
Fixed, hopefully.

Modified file: http://hg.netbeans.org/main?cmd=changeset;node=d4b1e4960e23

Comment 7 novakm 2008-03-20 12:28:10 UTC

Unable to reproduce now, verified.