Maximo Open Forum

In a few months' time, version 9.1 of MAS will be available, bringing several updates to the Manage runtime and libraries, and moving the old Maximo EAM code up to date. In particular, it will use Java 17, which will have a number of implications, including an upgrade to BIRT v4.16 and the use of OpenJDK Nashorn libraries.
So get ready to recompile all your customizations in Java (more than the lack of compatibility mode, beware of module-based library isolation because it may cause some surprises), automation scripts and so on.
In this regard, IBM has published these technical notes:

• IBM Maximo Manage: Transition to Java 17 from Maximo Application Suite 9.1 support announcement
• IBM Maximo Manage: Guidelines for diagnostics and testing when migrating from Java 8 to Java 17 in Maximo Application Suite 9.1
• IBM Maximo Manage : Troubleshooting guide for Java 17 from Maximo Application Suite 9.1