UnsatisfiedLinkError: emit

Richard Dale

2006-08-24 16:53:18 UTC

Post by Olivier Dragon
Hi,
I'm having issues with the emit() routine in QObject with qtjava and I
would really appreciate help in troubleshooting this error. I'm
Exception in thread "main" java.lang.UnsatisfiedLinkError: emit
at org.kde.qt.QObject.emit(Native Method)
at org.kde.qt.QObject.emit(QObject.java:117)
at ui.MainNetworkList.slotRefreshNetworks(MainNetworkList.java:120)
at ui.MainNetworkList.<init>(MainNetworkList.java:65)
at ui.MainNetworkList.<init>(MainNetworkList.java:32)
at Sonar.main(Sonar.java:44)

This is the Java emit method:

public native void emit(String signal, Object[] args);

And this is the JNI function it should link against:

JNIEXPORT void JNICALL
Java_org_kde_qt_QObject_emit(JNIEnv* env, jobject obj, jstring signal,
jobjectArray args)
{
QtSupport::emitJavaSignal(env, obj, signal, args);
return;
}

I would be very surprised if JNI method signatures had changed in Java 1.5.
The only thing I can suggest is trying an earlier Java with the Debian libs,
or gcj perhaps. If you can get the sources try building the .jar files with
the Java 1.5 and 1.4 javacs and see if there is any difference. Its strange
that it 'half works' if you can get a slot to work with a KPopupMenu I would
have expected everything to work.

-- Richard

Post by Olivier Dragon
In Sonar.java I have the required
static
{
qtjava.initialize();
kdejava.initialize();
}
And all the libs, forms and GUI components load just fine, which is what
is throwing me off. QObject.connect() also seems to work (it doesn't
throw any errors or exceptions). Could it be a problem with Java 1.5? I
am using 1.5 features like generics and enums but not with emit() or
connect(). Could it be a mismatch of versions with libs?
I also tried to make a small program to make sure nothing else was
interfering with it but unfortunatly it wouldn't work. I didn't get the
UnsatisfiedLinkError exception, but the emit() wouldn't go through...
nothing was happening. Linking a KPopupMenu item to a slot worked though.
ii libqt3-java 3.5.3-1 Java
bindings for Qt ii libqt3-jni 3.5.3-1
Java bindings for Qt ( Native libraries ) ii libkde3-java
3.5.3-1 kdelibs bindings for Java ii libkde3-jni
3.5.3-1 kdelibs bindings for java (
Native libraries ) ii libqt3-headers 3.3.6-3
Qt3 header files ii libqt3-mt 3.3.6-3
Qt GUI Library (Threaded runtime version), Version 3 ii
kdelibs4c2a 3.5.4-3 core libraries
and binaries for all KDE applications ii kdelibs-data
3.5.4-3 core shared data for all KDE applications
java version "1.5.0_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_04-b05)
Java HotSpot(TM) Client VM (build 1.5.0_04-b05, mixed mode, sharing)
Thank you, I really appreciate you time and help.
-Olivier
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