SAP JVM update to latest version in NW 7.31 Java only stack

Hi ALL,

Can I know what is the procedure involved updating JVM? As there is no JSPM in 7.31 what are the options to update?

I tried by extracting SAR file and changing version in parameter file but it wasn't successful. After changing to latest version Java stack has not started.

Are there any dependencies in updating JVM?

We have a portal system with different version of JVM, Does this has anything to do?

I would like to update from SAP JVM 6.1_35  to JVM 6.1_63.

Please help

Thanks,

Dheeraj