Http shutdown when upgrade from 5.0.1.0 to 6.5

I am trying to upgrades Lotus Domino 5.0.1.0 to 6.5.1 in Linux Redhat 7.3 platform. When it is completed, it gives follwoing errors and it shuts down HTTP task.

JVM: The Java Virtual Machine creation returned an inval

id JVM machine pointer.

JVM: Java Virtual Machine failed to start

HTTP Server: Error Loading Java Virtual Machine

HTTP Server: JVM: Missing entrypoint in JVM runtime libr

ary.

AMgr: Executive ‘1’ started

SMTP Server: Started

Mail Router started for domain XXXXXXXX

AMgr: Executive ‘2’ started

HTTP Server: Shutdown

Any advice would be appreciated!

Nobuyoshi