[kepler-users] Why doesn't "Listen to Actor" work on Kepler 2.2/2.3 for Windows?

[Daniel Crawl]

Hi Christopher,

Thanks for the fix. I agree with you that it'd be good to fix the ptII
branch in svn for Kepler 2.3. Before creating a new patch release, I
would wait until we've had more time to test since there could be
additional Java 7 problems.

   --dan


On 2/16/12 9:53 AM, Christopher Brooks wrote:
> All:
> It looks like the problem has to do with Java 1.7. I was able to
> reproduce this on the Mac
> with two different early release versions of 1.7. The bug occurs in
> Ptolemy II, outside of
> Kepler.
>
> The bug report is at
>
> http://bugzilla.ecoinformatics.org/show_bug.cgi?id=5574
>
> The fix is to modify ptolemy/actor/gui/TextEditor.java to check if
> _scrollbar is null:
>
> public Color getBackground() {
> // Under Java 1.7 on the Mac, the _scrollbar is sometimes null.
> // See http://bugzilla.ecoinformatics.org/show_bug.cgi?id=5574
> if (_scrollPane != null) {
> return _scrollPane.getBackground();
> } else {
> return null;
> }
> }
>
> I'm not sure why this is happening, but I suspect the problem is that in
> Java 1.7
> setBackground is calling getBackground on subcomponents and the TextEditor
> subcomponent is not completely instantiated.
>
> There could be other places where this problem occurs. I'll switch over
> to Java 1.7 and see
> what turned up. It would be worth running the debugger and verifying
> that we are in the
> Swing Event Thread when the problem occurs.
>
> I'll leave it to the Kepler Team to decide how to handle this. My
> proposal is that I patch the
> ptII branch used in the release with the above change. I'd like to wait
> until a few people have exercised
> Kepler under 1.7 before doing so though. If we patch the ptII tree used
> in Kepler-2.3, then at
> least people who are working from the 2.3 tree can get the update. I'm
> not sure about releasing
> a patch release to Kepler, that is up to others.
>
> _Christopher
>
> On 2/15/12 1:34 PM, Daniel Crawl wrote:
>>
>> Hi Edward and Daren,
>>
>> "Listen to Actor" is invoked from the context menu on the canvas,
>> and the exception is also thrown when double-clicking on the Python
>> Actor to edit the script. These are probably run from the Swing
>> event thread.
>>
>> Daren, thanks for verifying this problem occurs with Java 7 but not 6.
>> I updated Kepler a few months ago so that it would compile with Java 7.
>> However, when I ran it, I didn't exhaustively test all the
>> functionality. I'll create bug report so this error is not forgotten.
>>
>> --dan
>>
>>
>> On 2/14/12 11:59 PM, Daren Thomas wrote:
>>> i resolved this issue temporarily by uninstalling java 7, thus
>>> ensuring java 6 is being used. it all works fine now. hope that helps!
>>>
>>> daren
>>>
>>> On 15.02.2012, at 00:51, "Edward A. Lee"<eal at eecs.berkeley.edu> wrote:
>>>
>>>>
>>>> This sort of thing can happen for GUI code that invoked outside
>>>> the Swing event thread. How is this being invoked? If it's just
>>>> from the menu, then I presume it is in the Swing event thread...
>>>>
>>>> Edward
>>>>
>>>>
>>>> On 2/14/12 11:29 AM, Daniel Crawl wrote:
>>>>>
>>>>> Hi Daren,
>>>>>
>>>>> I get the same behavior with Windows 7. The error is the same for
>>>>> both "Listen to Actor" and editing a Python script:
>>>>>
>>>>> java.lang.NullPointerException
>>>>> at ptolemy.actor.gui.TextEditor.getBackground(TextEditor.java:144)
>>>>> at java.awt.Window.setBackground(Unknown Source)
>>>>> at java.awt.Frame.setBackground(Unknown Source)
>>>>> at ptolemy.gui.Top.access$1001(Top.java:141)
>>>>> at ptolemy.gui.Top$SetBackgroundRunnable.run(Top.java:1889)
>>>>> at ptolemy.gui.Top.deferIfNecessary(Top.java:247)
>>>>> at ptolemy.gui.Top.setBackground(Top.java:501)
>>>>> at ptolemy.actor.gui.TextEditor.setBackground(TextEditor.java:238)
>>>>> ...
>>>>>
>>>>> Christopher, do you know what causes this?
>>>>>
>>>>> Thanks,
>>>>>
>>>>> --dan
>>>>>
>>>>>
>>>>> On 2/8/12 4:28 AM, Daren Thomas wrote:
>>>>>> I can use "Listen to Actor" for Kepler 2.3 on Mac OS X, but not under
>>>>>> Windows. When I select the option from the context menu, nothing
>>>>>> happens.
>>>>>>
>>>>>> Also, when I try to edit a script for the Python actor, I get an
>>>>>> error
>>>>>> message "Failed to open a dialog to edit the target (null)" - this
>>>>>> doesn't bother me ATM, but I guess I should mention it, as it
>>>>>> could be
>>>>>> an additional symptom of a wrongly configured system.
>>>>>>
>>>>>> I installed Kepler 2.3 on Windows with the installer provided on the
>>>>>> website. It seems "all" questions in the users list refer to
>>>>>> compiling
>>>>>> your own version/environment. Is that the way to go?
>>>>>>
>>>>>> Regards,
>>>>>> Daren Thomas
>>>>>> _______________________________________________
>>>>>> Kepler-users mailing list
>>>>>> Kepler-users at kepler-project.org
>>>>>> http://lists.nceas.ucsb.edu/kepler/mailman/listinfo/kepler-users
>>>>>>
>>>>> _______________________________________________
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>>>> <eal.vcf>
>>>
>>
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