On 2008-04-21 21:41:52 +0200, "Yan Shapochnik" <[EMAIL PROTECTED]> said:
I am experiencing an issue with a simple JNI app on Mac OS X using the 4.4.0
Cocoa Port alpha and Mac OS X 10.5.2 w/ Apple's JVM 1.5.0_13-b05-237.
The java application is a very simple Swing application. It displays a frame
with a button. Once the Swing button is clicked it makes a call via JNI to
the native library which uses Qt to attempt and display a QMessageBox
modally.
Here is a code snippet from the native implementation:
#include <QtCore>
#include <QtGui>
#include "HelloWorldImp.h"
JNIEXPORT void JNICALL Java_HelloWorld_displayHelloWorld(JNIEnv *env,
jobject obj)
{
int argc = 0;
char *argv[] = {""};
QApplication *pqapp = new QApplication(argc, argv);
QMessageBox mb;
mb.exec();
}
When I click the Swing button and a call is made into native library, the
application crashes with the following error:
2008-04-21 15:15:09.301 java[29340:13a03] *** -[NSApplicationAWT
setQtPrivate:]: unrecognized selector sent to instance 0x125430
2008-04-21 15:15:09.303 java[29340:13a03] An uncaught exception was raised
2008-04-21 15:15:09.303 java[29340:13a03] *** -[NSApplicationAWT
setQtPrivate:]: unrecognized selector sent to instance 0x125430
2008-04-21 15:15:09.304 java[29340:13a03] *** Terminating app due to
uncaught exception 'NSInvalidArgumentException', reason:
'*** -[NSApplicationAWT setQtPrivate:]: unrecognized selector sent to
instance 0x125430'
Hi Yan,
I suspect what is happening that Swing implements its own NSApplication
subclass, and so does Qt and there can be only one subclass in an
application. what is happening here is that the Swing subclass is
created before the Qt one, and when we try to use our subclass, it will
through an exception. I would assume you would have other issues if you
created the Qt subclass first and the swing version tried to call its
extra methods.
I've yet to get a good solution to this issue. I'm afraid for the time
being, you simply can't use the Cocoa with a swing Java app. :-(
-- Trenton
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