error regarding redhat-list at redhat.com (I think)

[eee at nmt.edu]

I'm running 64 bit Dell Precision T7400 running RHE 5.4, fully patched. 
While trying to execute a java program I recently installed, I receive the
following output:

[earl at localhost Kerika-1.2]$ java -jar ui.jar
Hello World!
user.dir=/opt/Kerika-1.2
getRelayURI=http://www.kerika.com/jxta/seeds/relays
getRendezVousURI=http://www.kerika.com/jxta/seeds/rdvs
Exception during event dispatch:
java.lang.NullPointerException
   at javax.swing.plaf.basic.BasicTextAreaUI.propertyChange(libgcj.so.7rh)
   at
javax.swing.plaf.basic.BasicTextUI$PropertyChangeHandler.propertyChange(libgcj.so.7rh)
   at java.beans.PropertyChangeSupport.firePropertyChange(libgcj.so.7rh)
   at java.beans.PropertyChangeSupport.firePropertyChange(libgcj.so.7rh)
   at java.awt.Component.firePropertyChange(libgcj.so.7rh)
   at javax.swing.JComponent.firePropertyChange(libgcj.so.7rh)
   at javax.swing.JTextArea.setLineWrap(libgcj.so.7rh)
   at com.kerika.terminal.JConsole.init(JConsole.java:65)
   at com.kerika.terminal.JConsole.<init>(JConsole.java:34)
   at com.kerika.ui.ui.startApplication(ui.java:197)
   at com.kerika.ui.ui$2.run(ui.java:145)
   at java.awt.event.InvocationEvent.dispatch(libgcj.so.7rh)
   at java.awt.EventQueue.dispatchEvent(libgcj.so.7rh)
   at java.awt.EventDispatchThread.run(libgcj.so.7rh)

It would seem that the problem is tied to libgcj.so.7rh.  How can I check
to see if it is installed on my machine?

Earl