Java application installation problem

[Shu Hung (Koala)]

Dear All,
I'm trying to install a java application (jedit) to my ubuntu.
I installed sun-java5-bin and etc packages.
Then I ran the installation file.
The result is as shown below:

koala at localhost:~/Downloads$ java -jar jedit42install.jar
Exception in thread "main" java.awt.AWTError: Cannot load AWT toolkit:
gnu.java.awt.peer.gtk.GtkToolkit
   at java.awt.Toolkit.getDefaultToolkit(libgcj.so.7)
   at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(libgcj.so.7)
   at java.awt.Window.<init>(libgcj.so.7)
   at java.awt.Frame.<init>(libgcj.so.7)
   at javax.swing.JFrame.<init>(libgcj.so.7)
   at installer.SwingInstall.<init>(SwingInstall.java:30)
   at installer.Install.main(Install.java:35)
Caused by: java.lang.ClassNotFoundException:
gnu.java.awt.peer.gtk.GtkToolkit
   at java.lang.Class.forName(libgcj.so.7)
   at java.lang.Class.forName(libgcj.so.7)
   at java.awt.Toolkit.getDefaultToolkit(libgcj.so.7)
   ...6 more

What did I got wrong?

Regards,
Koala Yeung
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