Re: z17 and z/OS 3.2 compatibility

Mathew,

On 1/20/26 4:55 AM, MATHEW THOMAS via users wrote:
> We are currently running Tomcat 10.1.13 on z/OS 3.2. We plan to upgrade 
> to z17 and z/OS 3.2, can you advice on any know requirements or fixes 
> needed for this and confirm if there are any compatibility issues?

I wouldn't guess that there would be any compatibility issues since the 
OS will be the same and presumably the hardware is fully 
backward-compatible. The only question is whether or not you will get 
any benefit from the z17 if the software doesn't change. For example, 
are there any JVMs available that take advantage of new capabilities?

Generally speaking, if the JVM runs, then Tomcat will run.

There are always potential issues with file handling, port handling, 
etc. when the host OS is significantly different from UNIX or Windows, 
but I don't see any of those things changing if you already have Tomcat 
running on your pre-17 z/ system and z/OS 3.2.

I agree with Zdenek that now would be a good time to consider upgrading 
your software versions like JVM (you didn't specify what you were 
running) and Tomcat (to 10.1.latest).

There are a bunch of important security fixes between the version you 
mentioned and the latest Tomcat 10.1.x release. This may be true of your 
JVM version as well.

-chris