IBM Z Software
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The JVM itself uses 31-bit storage for internal areas, we've seen things like JIT, class-storage, AOT and other components move partially into 64-bit storage where possible, thus making the JVMs footprint in 31-bit less over time...but ultimately this would be a requirement against the Java Runtimes team and subsequently onto OpenJDK and Open communities.
The next level down would be LE and z/OS itself. It would have to restructured to avoid using 24-bit, 31-bit storage for Threads and TCBs and ECBs and still support all the COBOL and assembler code out there.
The CICS API is 31-bit, so to call into CICS would require 31-bit thunking down from the 64-bit JVM. The task of 64-bit enabling was evaluated some years ago and the development cost would be enormous for little or no gain. Our conclusion has been we can get a better ?bang for the buck? by moving our CICS ?stuff? out of the way, ie above the bar, to allow more room for customer data and programs.