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Status Future consideration
Workspace IBM Java SDK for z/OS
Created by Guest
Created on Feb 16, 2024

RELATED IDEAS

Sharing one Java Shared Classcache between different users and its restrictions

We plan to use the Java Shared Classcache for our Java Batch Jobs to improve CPU usage and performance of our batch jobs. The batch jobs use for security reasons different users but should share one classcache. Sharing the same Shared Class Cache requires, that with the activation of the shared class cache via java -Xshareclasses:name=sample an additional parameter groupaccess must be used (no problem), and second (this is the problem), that all users must have the same default RACF group, or, to be more precisely, have the same GID for their default group. This is a very strong implication, especially in established environments, where default groups and their GIDs follow other rules and can't be changed easily. A better implementation would be, for example, to require for access to the cache, that the different users are member of a RACF group and this RACF group can be passed via a parameter to the job which creates the cache. Other solutions which don't require changes of over years established determinations would also be welcome. 

Idea priority High
  • Guest
    Reply
    |     May 7, 2024
    This requirement requires more investigation with z/OS security team to analyze what can, or cannot be done with Shared Class Cache in Java.

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