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A developer's deep dive into the four-file MBO pattern behind every Maximo object, how MAXOBJECT.CLASSNAME links to the MBO Set, and how a PLUS extension layers on.

MAS 9.1 moved the JVM under every Maximo customization from Java 11 to Java 17. MAS 9.2 (June 2026) adds Java 25 at the platform and AI-Service level while Java 17 stays the baseline for Manage and your custom code. Here is what changes for existing extensions, why 9.2 is a mixed Java-17/Java-25 environment, how to test and remediate, and why the extension model endured while everything around it modernized.