Hi,
go to this site bellow and search for "jre". There is an article "How to install and configure DB2 for Linux and the Java Runtime Environment". I did steps 1,2 and 3 only because the others are related to DB2 settings.
http://www-106.ibm.com/developerworks/
In fact I did add the LD_ASSUME_KERNEL line in the profile but for some "unknown" reason to me it is not there anymore and it is working not yet fine because of the access problem to the primary server.
Pedro