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RogerLacroix · Posted: Thu Sep 05, 2002 8:57 am Post subject: Java and OS/390 (mainframe)

All:

Someone posted a question about Java on the mainframe on a Java ListServer. So I thought I would also post my answer here - in case anyone is interested.

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Hi,

Java on OS/390 (mainframe) under USS (Unix System Services) works really, really well. I am the Architect / Developer for a prototype Java application that will run on OS/390. It will use the following technologies: Java, XML4J, MQSeries, IMS, OS/390 datasets (not HFS files).

Basically, the Java application on OS/390 will retrieve a XML message from a queue of a queue manager on OS/390. Parse the message for product codes, etc.. then execute an IMS transaction using Java OTMA Callable Interface (not under IMS BMP or MPP). The Java application will take the reply from the IMS transaction and format as a CSV (Comma Separated Value) file. The CSV formatted data will be written to a queue and also written to an OS/390 dataset (backup only).

People always get weird about mainframes. There is nothing weird about them. Think of a mainframe as an incredibly fast server.

Here are some links for the technologies mention above:

Java on OS/390 v1.3.1
http://www-1.ibm.com/servers/eserver/zseries/software/java/

XML4J v3.2.1 - An excellent XML parser
http://www-1.ibm.com/servers/eserver/zseries/software/xml/

MQSeries (WebSphere MQ) SupportPac - MA88
http://www.ibm.com/software/ts/mqseries/txppacs/ma88.html

Accessing OS/390 datasets (not HFS files) JRIO - it is included with Java v1.3.1 but here is a link:
http://www-1.ibm.com/servers/eserver/zseries/software/java/jrio/overview.html

Using the Java OTMA Callable Interface
http://www-1.ibm.com/servers/eserver/zseries/zos/unix/bpxa1ty2.html

Interesting reading and links about Java & XML on OS/390
http://www-1.ibm.com/servers/corner/

Hope that helps.

later
Roger Lacroix
Enterprise Architect
Capitalware Inc.
http://www.capitalware.biz