I installed under root the package ant ( yum install ant ).
I installed under root the latest jdk in /usr/local (jdk-6u4-linux-i586.bin)
I added the JAVA_HOME to my .bash_profile
I added the $JAVA_HOME/bin to my PATH in the .bash_profile (in front of the rest)
In my home dir I created a directory oc4j_client_11110_preview in which I unzipped the oc4j_client_11110_preview.zip.
I added the OC4J_HOME to my .bash_profile
In my home dir I created a directory toplink_11.1.1.0_071214_preview-3 in which I unzipped the toplink_11.1.1.0_071214_preview-3.zip.
I added the TOPLINK_HOME to my .bash_profile
In my home dir I created a directory oc4j_admin_client_11110_preview in which I unzipped the oc4j_admin_client_11110_preview.zip.
I added the OC4J_ADMIN to my .bash_profile
In my home dir I created a directory myclasses wherin I downloaded ojdbc6.jar from Oracle JDBC download page.
now I have the needed jar libraries.