java gtk

I'm trying to run a 3rd party Java program on my linux box which has
GNU java.  I get the following error:

Exception in thread "GtkMain" java.lang.UnsatisfiedLinkError: gtkInit
   at _Jv_LookupJNIMethod (/usr/lib64/libgcj.so.5.0.0)
   at _Jv_JNIMethod.call(ffi_cif, void, ffi_raw, void)
(/usr/lib64/libgcj.so.5.0.0)
   at gnu.java.awt.peer.gtk.GtkMainThread.run() (Unknown Source)
   at java.lang.Thread.run() (/usr/lib64/libgcj.so.5.0.0)
   at _Jv_ThreadRun(java.lang.Thread) (/usr/lib64/libgcj.so.5.0.0)
   at GC_start_routine (/usr/lib64/libgcj.so.5.0.0)
   at __clone (/lib64/tls/libc-2.3.4.so)

Any suggestions?  Also, please explain what's going on.  It seems that
the appropriate symbols are in libraries beginning with
/usr/lib64/lib-gnu-java-awt-peer-gtk.so but gij doesn't load that.
That's as much as I know.