[fedora-java] Java OpenGL on FC4

[John M. Gabriele]

--- Anthony Green <green at redhat.com> wrote:

> On Sun, 2005-08-14 at 20:26 -0700, John M. Gabriele wrote:
> > [john at localhost ~/dev/java/JOGL_Example]$ gij -cp /usr/share/java/jogl.jar
> Test
> > Exception in thread "main" java.lang.UnsatisfiedLinkError: libjawt: file
> not
> > found
> >    at java.lang.Runtime._load(java.lang.String, boolean)
> > (/usr/lib/libgcj.so.6.0.0)
> 
> For some reason gij doesn't know where libjawt.so is.  I think fitzsim
> and I have discussed, but I don't recall the result.
> 
> Try doing this before running your program.  It should fix it:
> 
> $ export LD_LIBRARY_PATH=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre/lib/i386
> 
> > Compiling to object works also:
> > 
> > gcj --classpath=/usr/share/java/jogl.jar -c Test.java
> > 
> > but trying to link that fails:
> > 
> > [john at localhost ~/dev/java/JOGL_Example]$ gcj
> > --classpath=/usr/share/java/jogl.jar --main=Test -o MyTest Test.o
> > Test.o(.text+0x1d): In function
> > `TestRenderer::init(net::java::games::jogl::GLDrawable*)':
> > Test.java: undefined reference to
> `net::java::games::jogl::GLDrawable::class$'
> 
> There are two solutions:
> 
> 1. Compile your code with -findirect-dispatch.
> 
> This will replace symbolic references to the jogl code with runtime name
> lookups.
> 
> or
> 
> 2. Link with -ljogl.jar.  This will link libjogl.jar.so to your program,
> which should resolve all of the jogl symbols.
> 
> Good luck!
> 
> AG

I think I'm gonna need just a bit more help.

So as not to confuse the issue, there's two different ways we're trying
to get this working here, and I'd like to get it working both ways:

    1. using gcj to AOT compile then run directly, and

    2. using gcj to compile to bytecode, then gij to run.


My code is just the simple code described here:
http://192.18.37.44/forums/index.php?topic=1474.0
(though I haven't yet gotten past the first few
messages on that thread)

The imports at the top look like:

import net.java.games.jogl.*;

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;


------------------- compile to native, then run directly ---------------
I built with this:

gcj --classpath=/usr/share/java/jogl.jar \
 -c Test.java

(which gives me Test.o) then

gcj --classpath=/usr/share/java/jogl.jar \
 --main=Test -ljogl.jar -o MyTest Test.o


[john at localhost ~/dev/java/JOGL_Example]$ ls -l
total 68
-rwxrwxr-x  1 john john 25934 Aug 15 21:24 MyTest
-rw-rw-r--  1 john john  4873 Aug 15 21:07 Test.java
-rw-rw-r--  1 john john 16584 Aug 15 21:24 Test.o


[john at localhost ~/dev/java/JOGL_Example]$ ldd MyTest
        linux-gate.so.1 =>  (0x0066c000)
        libjogl.jar.so => /usr/lib/libjogl.jar.so (0x0066d000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x0056f000)
        libgcj.so.6 => /usr/lib/libgcj.so.6 (0x0259d000)
        libm.so.6 => /lib/libm.so.6 (0x003db000)
        libpthread.so.0 => /lib/libpthread.so.0 (0x00111000)
        libz.so.1 => /usr/lib/libz.so.1 (0x00407000)
        libdl.so.2 => /lib/libdl.so.2 (0x00401000)
        libc.so.6 => /lib/libc.so.6 (0x002af000)
        /lib/ld-linux.so.2 (0x00291000)


[john at localhost ~/dev/java/JOGL_Example]$ echo $LD_LIBRARY_PATH
/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre/lib/i386


[john at localhost ~/dev/java/JOGL_Example]$ ls -l
/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre/lib/i386
total 4
lrwxrwxrwx  1 root root 23 Jul 30 01:25 libjawt.so -> /usr/lib/libgcjawt.so.6

[john at localhost ~/dev/java/JOGL_Example]$ ./MyTest
Exception in thread "main" java.lang.LinkageError: unexpected exception during
linking: net.java.games.jogl.GLCapabilities
   at java.lang.VMClassLoader.transformException(java.lang.Class,
java.lang.Throwable) (/usr/lib/libgcj.so.6.0.0)
   at java.lang.VMClassLoader.resolveClass(java.lang.Class)
(/usr/lib/libgcj.so.6.0.0)
   at java.lang.Class.initializeClass() (/usr/lib/libgcj.so.6.0.0)
   at Test.main(java.lang.String[]) (Unknown Source)
   at gnu.java.lang.MainThread.call_main() (/usr/lib/libgcj.so.6.0.0)
   at gnu.java.lang.MainThread.run() (/usr/lib/libgcj.so.6.0.0)
Caused by: java.lang.NullPointerException
   at java.lang.VMClassLoader.resolveClass(java.lang.Class)
(/usr/lib/libgcj.so.6.0.0)
   ...4 more


----------------- compile to bytecode, then interpret -----------

Ok, I can build the bytecode like so:

gcj --classpath=/usr/share/java/jogl.jar -C Test.java

(just changing the above -c to -C)

then

[john at localhost ~/dev/java/JOGL_Example]$ echo $LD_LIBRARY_PATH
/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre/lib/i386

and running it actually brings up a window and draws something
which is red and flickers a bit, but doesn't look like a triangle.
Here's the nasty-looking messages that come up in my terminal
window:

[john at localhost ~/dev/java/JOGL_Example]$ gij -cp /usr/share/java/jogl.jar Test
Init GL is net.java.games.jogl.impl.x11.X11GLImpl

(.:3155): GLib-GObject-WARNING **: invalid uninstantiatable type `(null)' in
cast to `GtkWidget'

(.:3155): GLib-GObject-WARNING **: invalid unclassed pointer in cast to
`GtkObject'

(.:3155): Gtk-CRITICAL **: gtk_widget_get_display: assertion `GTK_IS_WIDGET
(widget)' failed
Aborted

-------------------------

Thanks for any help,
---John



		
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