SAP will update SAP JVM, which is part of the SAP BusinessObjects Business Intelligence 4.x suite, through the normal maintenance process.The required updates will be part of suite maintenance releases. SAP does not support manual updates of SAP JVM as this might bring
incompatibility issues to BI 4.x components that utilize SAP JVM..
Please check the below note:
1693124 - SAP BI4.0 SAP JVM Update Official Policy
No need to manually patch JDK/JRE, it should automatically done:
Please check the below note to upgrdate JRE/JDK
1668835 - How to upgrade the JRE and JDK version provided by BOE XI 3.1 and BOE BI 4.0?
I hope this answers you question