Why RHN update IBM JDK ?

Fri May 14 04:15:38 UTC 2004

Redhat Network(RHN) updates has
  IBMJava2-JRE-1.3.1-10.i386.rpm
  IBMJava2-SDK-1.3.1-10.i386.rpm

this rpm installed /opt/IBMJava2-131 same place.

IBMJava2-JRE-1.3.1-10 not found in 
http://www-106.ibm.com/developerworks/java/jdk/index.html

# ./java -fullversion
java full version "J2RE 1.3.1 IBM build
cxia32131-20031021"
#

When we use IBM DB2 8.1.5 or WebSphere 5.1,
shuld we use redhat's IBMJava2-JRE-1.3.1-10 ?

Redhat supports IBM JDK ?