[kaffe] RE: Re: Cannot run AWT on Kaffe

Ronald Sloot Ronald.Sloot at arm.com
Tue Jun 12 05:01:11 PDT 2007

I had this problem on my ARM build of Kaffe:

> kaffe -Xkaffe-xlib-awt WidgetsDemo
> java.lang.InternalError: Pointer class was not properly initialized 

Turns out this "java.lang.InternalError: Pointer class was not properly
initialized" error is getting caused as a result of libxawt.so not
exporting JNI_OnLoad. 

When the libxawt.so library gets loaded by loadNativeLibrary
(kaffe/kaffevm/external.c) it probes for JNI_OnLoad. If it doesn't find
it it goes on and eventually hits the internal error in
Java_java_awt_Toolkit_fntInitFont() when it tries to use
JCL_NewRawDataObject to return the font object. 

triggers the internal error because it finds dat (jclass)rawDataClass is
not setup. This variable is setup by JNI_OnLoad to the suited Pointer
object of the platform ("gnu/classpath/Pointer64" or

By modifying the Makefile in libraries/clib/awt/X/Makefile.in so that it
also exports JNI_xxx, the WidgetsDemo program continues.

	Makefile.in: -export-symbols-regex "^([Jj]ava|kaffe|JNI)_"

BTW, I am not certain if this is the correct fix but it does the trick
for me, but I definitely don't understand why anybody else is not
running into this problem either (with -Xkaffe-xlib-awt).

With this fix the WidgetsDemo completes its initialisation and I see a
filled rectangle being drawn but then nothing anymore. I think the next
problem is that for some reason events are not getting distributed. The
Paint event certainly isn't happening....

Anybody else that has seen this before and knows a fix ?

-- Ronald

> -----Original Message-----
> From: Ronald Sloot 
> Sent: 05 June 2007 13:29
> To: 'kaffe at kaffe.org'
> Subject: Re: Cannot run AWT on Kaffe
> Hi, 
> I am actually getting the same problem as Kelvin when I run 
> WidgetsDemo on kaffe 1.1.8-pre on ARM: 
> > kaffe -Xkaffe-xlib-awt WidgetsDemo
> java.lang.InternalError: Pointer class was not properly initialized 
> I am using the following config: 
> ./configure --with-engine=intrp --with-kaffe-x-awt 
> --disable-gconf-peer --disable-gtk-peer 
> I build with gcc 4.1.1. 
> Riccardo, since you didn't get the problem, can you let us 
> know what configuration you used and what target platform ? 
> I build an x86 version too and that doesn't seem to have the problem. 
> I actually also got the same problems on a 1.1.7 version. 
> Debugging it shows something goes wrong when the first event 
> dispatch thread is created and it calls the function 
> InheritableThreadLocal.newChildThread() in which it executes 
> Iterator keys = parentThread.locals.keySet.iterator(). 
> Something goes wrong in that iterator (parentThread != NULL). 
> Does anybody have any ideas, things I can try ? 
> When I add the -v option I get the following output leading 
> upto the error message: 
> Loading 
> java/awt/EventQueue.class(/usr/local/kaffe/jre/lib/kaffeawt.ja
> r) [compressed] 
> Loading 
> java/awt/event/AWTEventListenerProxy.class(/usr/local/kaffe/jr
> e/lib/glibj.zip) [compressed] 
> Loading 
> java/util/EventListenerProxy.class(/usr/local/kaffe/jre/lib/gl
> ibj.zip) [compressed]Loading 
> java/awt/event/AWTEventListener.class(/usr/local/kaffe/jre/lib
> /kaffeawt.jar) [compressed] 
> Loading 
> java/awt/EventDispatchThread.class(/usr/local/kaffe/jre/lib/ka
> ffeawt.jar) [compressed] 
> Loading 
> java/lang/InheritableThreadLocal.class(/usr/local/kaffe/jre/li
> b/glibj.zip) [compressed] 
> Loading 
> java/util/AbstractMap$1.class(/usr/local/kaffe/jre/lib/glibj.z
> ip) [compressed] 
> Loading 
> java/util/AbstractMap$1$1.class(/usr/local/kaffe/jre/lib/glibj
> .zip) [compressed] 
> Loading 
> gnu/java/util/WeakIdentityHashMap$WeakEntrySet$1.class(/usr/lo
> cal/kaffe/jre/lib/glibj.zip) [compressed] 
> java.lang.InternalError: Pointer class was not properly initialized 
> Thanks 
> -- Ronald 
> PS: 
> kaffe -fullversion produces: 
> .. 
> Engine: Interpreter   Version: 1.1.8-pre   Java Version: 1.4 
> Heap defaults: minimum size: 5 MB, maximum size: unlimited 
> Stack default size: 64 KB 
> Configuration/Compilation options: 
>   Compile date     : Tue Jun 5 11:10:24 SAST 2007 
>   Compile host     : debian 
>   Install prefix   : /usr/local/kaffe 
>   Thread system    : unix-pthreads 
>   Garbage Collector: kaffe-gc 
>   CC               : gcc 
>   CFLAGS           : -Wall -W -Wextra -fno-strict-aliasing 
> -fno-omit-frame-pointer -fsigned-char -pthread-g -O2 
>   LDFLAGS          : 
>   ChangeLog head   : 2007-05-26  Ito Kazumitsu  <kaz at maczuka.gcd.org> 

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