On Fri, 29 Jul 2022 14:24:34 GMT, Tejesh R <t...@openjdk.org> wrote:
>> `DebugGraphics` class has a Graphics instance which is been used in slowed
>> down drawing. The `graphics` object is not initialized anywhere inside the
>> class, where it is expected to set explicitly by the user. When the user
>> doesn't set it and try to use the any mehtods like `drawing/setFont`, NPE is
>> raised which is expected. The scenario is taken care by checking if the
>> `graphics` object is null before using it inside the class, thus eliminating
>> the NPE case.
>
> Tejesh R has updated the pull request incrementally with one additional
> commit since the last revision:
>
> Fix: Java doc modified and Graphics contexts created in null case
src/java.desktop/share/classes/javax/swing/DebugGraphics.java line 87:
> 85: // directly.
> 86: StackWalker walker =
> StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE);
> 87: if ((graphics == null) && (walker.getCallerClass() !=
> this.getClass())) {
I don't know if creating a StackWalker is expensive but I think it should be
done only if graphics == null
Also the version of getInstance() being called here might throw
SecurityException
https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/StackWalker.html#getInstance(java.lang.StackWalker.Option)
So you'll need to wrap it in a doPrivileged.
-------------
PR: https://git.openjdk.org/jdk/pull/9673
