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Status Not under consideration
Workspace CICS Transaction Server for z/OS
Categories Other
Created by Guest
Created on Sep 6, 2023

RELATED IDEAS

Would like to see a CEMT Command to Inquire/SET the CICS/JVM Profile

It would be nice to have the capability to issue a CEMT SET/INQUIRE on a CICS/JAVA Profile for a specific JVM.

Currently we cannot View the properties of a JVMProfile from within a CICS Address Space, we need to go to TSO and use OMVS or ISHELL to view the properties of the JVMProfile.

I would be a helpful to (1) issue a CEMT INQUIRE on the Properties of a JVMProfile from within a CICS Region, ...  (2) Dynamically Change The Profile from the CEMT Command, and then (3)  Issue a SET New verion of the JVMProfile without Stopping/starting the JVM Server and/or recycling the CICS Address Space.  The Dynamic changes would not necessarily update the DFHJVM Profile.

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Once We know the change is good, we can use OMVS/ISHELL to permanently change the JVMPROFILE for a specific JVMServer.

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Idea priority Medium
  • Guest
    Reply
    |     Oct 2, 2023
    We acknowledge that once the JVMSERVER has started, it is theoretically possible to modify the JVM profile on zFS, such that the disk contents are out of synchronisation with the active environment. These types of update/change should have careful change-process around them to ensure they are controlled.

    However, one setting that might be useful is "PRINT_PROFILE=TRUE", which causes the JVMSERVER to take a snapshot of the JVM profile contents at the time it goes ENABLED and is therefore the set of properties that will apply for the life-time of the JVM (the JVMSERVERs enable/disable cycle). The output is typically written to SYSPRINT in the CICS log.


    Although a valid suggestion, this request is declined at this time for the following reasons:

    - The JVM profile is a free-form textual file and is not well suited to display in CEMT.

    - Strategic solutions for finding, viewing and modifying JVM profiles are to use zFS based tooling. For example, SSH, or FTP as very simple approaches. Dedicated sys-prog tools such as CICS Explorer provide zFS hyperlinks from the JVMSERVER resource directly to the file.

    - JVM profile changes cannot be enacted dynamically. The JVMSERVER must be restarted (disable/re-enable) to re-load changes, and values taken during start-up are considered absolute. Note: it is NOT necessary to restart the CICS region to update and refresh properties, only the specific JVMSERVER(s) needs to be re-enabled.

    - The JVM profile dictates how a JVMSERVER starts and will control major differences in behaviour (for example whether the server is Axis2, OSGi, or Liberty). Changes to the JVM profile should first be made in a test environment. The JVM is not designed to read and apply properties once in flight.

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