for adjusting OC4J configuration to support Arabic do the following:

in the OC4J Server Properties screen in the Command Line Options block add the red options to your Java Options as follows:

Java Options= -Xms512m -Xmx512m -server
-Djava.security.policy=/u01/app/oracle/products/10gias/j2ee/OC4J_EPS/config/java2.policy
-Djava.awt.headless=true -Duser.region=AE -Duser.language=ar
-Dfile.encoding=windows-1256 -Xverify:none