Am Freitag, 14. Januar 2005 04:49 schrieb Archie Cobbs: > I got an assertion failure in JC when running a simple Swing app. > The stack trace showed JC invoking a gtkpeer native method with > one JNIEnv *, some gtk code, and then gtkpeer calling back into > JC via the JNI invocation interface with a *different* JNIEnv * > (belonging to a different thread), i.e.: > > ... > #7 0x2808e213 in CallVoidMethod (jenv=0xcd33498, obj=0xd0600b0, > method=0xd4a10e0) at jni_native.c:442 > #8 0x29c32d9b in connect_awt_hook_cb () > from /usr/local/lib/classpath/libgtkpeer.so > #9 0x2ae36b1d in g_cclosure_marshal_VOID__VOID () > from /usr/local/lib/libgobject-2.0.so.400 > #10 0x2ae200f5 in g_closure_invoke () from > /usr/local/lib/libgobject-2.0.so.400 ... > #21 0x2ae345c5 in g_signal_emit () from > /usr/local/lib/libgobject-2.0.so.400 #22 0x2ab91b24 in > gtk_widget_show () from /usr/X11R6/lib/libgtk-x11-2.0.so.400 #23 > 0x29c3920e in > Java_gnu_java_awt_peer_gtk_GtkWindowPeer_nativeSetVisible () from > /usr/local/lib/classpath/libgtkpeer.so > #24 0x280b2a73 in ffi_call_SYSV () from /usr/local/lib/libjc.so.1 > ... > > The JNIEnv * passed back in frame #23 is different from the one > passed back in frame #7 (not visible in the trace, but I know it's > different). > > Before I go digging into the GTK code, has anyone else seen this? > > NOTE: this is with Classpath 0.12, so it might be fixed already > (has anyone fixed a bug like this lately?) > > Thanks for any hints about where to look, etc.
We triggered exactly the same bug with jamvm lately. Mark found out it was a bug in jamvm handling JNIEnv* wrongly. I don't know if this was a fix or a hack. But it helped. Perhaps its a bug in JCVM regarding handling of JNIEnv. The GTK peer saves a JNIEnv* pointer for later use for the callback methods. This is according to the JNI spec at least not absolutely correct. The correct way would be to get the current JNIEnv* object through the global JavaVM object. That is not done yet. Perhaps this would help you and other VMs. Michael -- Homepage: http://www.worldforge.org/ _______________________________________________ Classpath mailing list [email protected] http://lists.gnu.org/mailman/listinfo/classpath
