Re: AWT and Jikes RVM

[Vasanth Venkatachalam]

The problem is that for a simple AWT program that just
displays a frame, the method GetJavaVM( ) gets called somewhere along the
way. This in turn calls the native method CreateJavaVM( ), which raises an
unimplementedNativeMethod exception. I have shown a snippet of the error
at the bottom of this message.

I looked around in the code for CreateJavaVM and found
confusing inconsistencies. Its declared in VM_JNIFunctions.java and 
implemented in a file (syswrap.C) which isn't even compiled into 
the VM default. There seems to be a typo in the implementation
(non-matching function prototype), and when I forced this file to be
recompiled, I wasn't able to run any programs at all. 

I don't see how someone could possibly get AWT working without
addressing this CreateJavaVM problem. I want to know how they got
past this error.

Here again is a snippet of the error message:

 Lcom/ibm/JikesRVM/VM_DynamicLinker; unimplementedNativeMethod()V at
line 41

Lcom/ibm/JikesRVM/jni/VM_JNIFunctions;
GetJavaVM(Lcom/ibm/JikesRVM/jni/VM_JNIEnvironment;Lcom/ibm/JikesRVM/VM_Address;)
I
at line 5395
   <native frame>
   <native frame>
   Lgnu/java/awt/peer/gtk/GtkMainThread; gtkInit(I)V at line 0
   Lgnu/java/awt/peer/gtk/GtkMainThread; run()V at line 102
   Ljava/lang/Thread; run()V at line 270
   Lcom/ibm/JikesRVM/VM_Thread; startoff()V at line 779
JikesRVM: exit 124




On Thu, 9 Dec 2004, Michael Koch wrote:

> Am Donnerstag, 9. Dezember 2004 05:23 schrieb Vasanth Venkatachalam:
> > Has anyone on this list succesfully run an AWT program (however
> > simple) on Jikes RVM using any of the classpath versions? I am
> > trying to do this for classpath 0.10 and have some specific
> > questions. I wasn't able to get much info from the jikes list so
> > I'm trying this one.
> 
> Steve Augart made it work some time ago. He fixed some issues in our 
> GTK peer. So I think it should work. What error message or wrong 
> behaviour do you get ? Perhaps it would be best to use GNU classpath 
> 0.12. Its the latest.
> 
> 
> Michael
> -- 
> Homepage: http://www.worldforge.org/
>