<Swing Dev> Patch for NPE at javax.swing.plaf.basic.BasicTreeUI$Actions.page:4470
Jaroslav Tulach
jaroslav.tulach at oracle.com
Thu Nov 15 15:58:35 UTC 2012
Dear Swing maintainers,
my name is Jaroslav Tulach and I am maintaining NetBeans explorer - a
component that is using JTree heavily.
>From time to time I receive a user report with a NPE from Swing where little
or even no NetBeans code involved. Just today I got
http://netbeans.org/bugzilla/show_bug.cgi?id=222081
We have about 35 other ones (which is not that much given the fact we have
million of users), but still...
According to
http://statistics.netbeans.org/exceptions/exception.do?id=628832
the report comes from jdk7u9-b05. The source code is here
http://hg.openjdk.java.net/jdk7u/jdk7u/jdk/file/jdk7u9-
b05/src/share/classes/javax/swing/plaf/basic/BasicTreeUI.java
and thus it looks like the call on line 4468 to
ui.getPathBounds(tree, newPath);
can return null (under some rare and unknown circumstances).
I can close the bug #222081 as "worksforme", but it is clear that such error
happens from time to time and we don't want our users to face errors. A
simple:
4469 if (newRect == null) return;
would do the trick. One question remains: if I try to donate such patch, will
you accept it?
-jt
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