[Geoserver-devel] mapPreview is not available

I installed GeoServer on Fedora Core5(linux).
But When I tried to show mapPreview, all examples generated no image.
Another function seemed correct.
Data directory exist in
'/usr/local/tomcat55/webapps//usr/local/tomcat55/webapps/geoserver'.

How I can view the images ?

I used the follows.
j2sdk-1_4_2_13-linux-i586-rpm.bin
apache-tomcat-5.5.20.tar.gz
apache-tomcat-5.5.20-compat.tar.gz(JDK 1.4 Compatability Package)
geoserver-1.3.4a-war.zip