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This bug was originally marked as duplicate of bug 204747, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.3 Beta 2 (Build 201211062253) VM: Java HotSpot(TM) Client VM, 23.3-b01, Java(TM) SE Runtime Environment, 1.7.0_07-b11 OS: Windows 7 Stacktrace: java.lang.AssertionError at org.netbeans.modules.form.layoutdesign.LayoutInterval.getCommonParent(LayoutInterval.java:596) at org.netbeans.modules.form.layoutdesign.LayoutUtils.alignedIntervals(LayoutUtils.java:528) at org.netbeans.modules.form.layoutdesign.LayoutFeeder.addToGroup(LayoutFeeder.java:1520) at org.netbeans.modules.form.layoutdesign.LayoutFeeder.addInterval(LayoutFeeder.java:1179) at org.netbeans.modules.form.layoutdesign.LayoutFeeder.add(LayoutFeeder.java:470) at org.netbeans.modules.form.layoutdesign.LayoutDesigner.addComponents(LayoutDesigner.java:850)
Created attachment 128350 [details] stacktrace
Can't figure out what could lead to this exception. Would be great to have a sample GUI form with description of steps how to reproduce it. For now I've added more checks and more logging to be able to better localize the cause.
*** Bug 222416 has been marked as a duplicate of this bug. ***
Closing as works for me for now. Anybody please reopen if can provide a reproducible test case. When (if) this problem occurs in future, a different exception will be reported.