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"<e...@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
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--
Christopher Brooks, PMP University of California
CHESS Executive Director US Mail: 337 Cory Hall
Programmer/Analyst CHESS/Ptolemy/Trust Berkeley, CA 94720-1774
ph: 510.643.9841 (Office: 545Q Cory)
home: (F-Tu) 707.665.0131 cell: 707.332.0670
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