IBM 64-bit SDK for z/OS, V5 - Restrictions and Other Considerations

(last updated July, 2008)


List of new I/O limitations
Sun bug number Brief description of limitation
4673298 Locking in Preferences sometimes fails on NFS mounted drives. NIO file locking over NFS might also be affected.


At Version 1.4.2 (64-bit) and Version 5 (31-bit), the IBM Runtime Environment for z/OS contained new versions of the IBM Java Virtual Machine (JVM) and the Just-In-Time (JIT) compiler. If you are migrating from an older IBM Runtime Environment, note that:

Other Considerations

Programs interacting with the 64-bit Java product, whether launching the JVM or being called from the JVM through the JNI interface, must be 64-bit programs. Programs dependent on JNI interfaces may require changes at the interface boundary to conform to 64-bit data types. Application JNI routines written in C will need to be recompiled for 64-bit, which may require some code changes.

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