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This bug was originally marked as duplicate of bug 156907, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.2 (Build 201207171143) VM: Java HotSpot(TM) Client VM, 20.1-b02, Java(TM) SE Runtime Environment, 1.6.0_26-b03 OS: Windows 7 User Comments: bartvdc: undo after moving component in GUI builder Stacktrace: java.lang.NullPointerException at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.getIntervalAlignment(SwingLayoutBuilder.java:369) at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.fillGroup(SwingLayoutBuilder.java:254) at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.composeGroup(SwingLayoutBuilder.java:238) at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.fillGroup(SwingLayoutBuilder.java:257) at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.composeGroup(SwingLayoutBuilder.java:238) at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.fillGroup(SwingLayoutBuilder.java:266)
Created attachment 131554 [details] stacktrace
Reported for 7.3.x or earlier, no new info since then -> closing as worksforme, please reopen in case you see it.