which Java on Xubuntu

To get a not Java 5 Java, I installed "gij" the Bytecode-Interpreter for 
GNU Java.

xngr.sh I altered to

#!/bin/sh
gij-wrapper-4.1 -Djava.security.policy=policy -jar xngr-browser.jar

I got

Exception in thread "main" java.awt.AWTError: Cannot load AWT toolkit: 
gnu.java.awt.peer.gtk.GtkToolkit

So I installed "libgcj7-awt" the AWT peer runtime libraries for use with 
gcj .

Now I get

Aborted (core dumped)


Is there a possibility for me to use XNGR ?

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