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MQSeries.net Forum IndexIBM MQ Java / JMSIBM MQ and OpenJDKs

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PeterPotkay
PostPosted: Mon Jun 17, 2019 11:27 am Post subject: IBM MQ and OpenJDKs Reply with quote

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Joined: 15 May 2001
Posts: 7545

Does IBM support any version of OpenJDK, from any vendor, for use with IBM MQ Clients, specifically the Resource Adapter?

I cant find anything that says it supports any specific flavor/version, or what criteria an OpenJDK must meet to be used with IBM MQ.
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Peter Potkay
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fjb_saper
PostPosted: Mon Jun 17, 2019 12:02 pm Post subject: Re: IBM MQ and OpenJDKs Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20025
Location: LI,NY

PeterPotkay wrote:
Does IBM support any version of OpenJDK, from any vendor, for use with IBM MQ Clients, specifically the Resource Adapter?

I cant find anything that says it supports any specific flavor/version, or what criteria an OpenJDK must meet to be used with IBM MQ.


Have you tried handling/treating the OpenJDK as if it were an oracle JDK?
I am thinking the main difference will be in the SSL behavior. For the rest it should behave the same as an IBM JDK...
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PeterPotkay
PostPosted: Wed Jun 19, 2019 6:58 am Post subject: Reply with quote

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Joined: 15 May 2001
Posts: 7545

Regarding the Oracle JRE, I found this:

https://blogs.oracle.com/java-platform-group/oracle-jdk-releases-for-java-11-and-later

Which closes with:
"What should we call them? Ideally, we would simply refer to all Oracle JDK builds as the "Oracle JDK," either under the GPL or the commercial license depending on your situation. However, for historical reasons while the small remaining differences exist, we will refer to them separately as Oracle's OpenJDK builds, and the Oracle JDK."


Does IBM MQs support for Oracles implementation distinguish between the GPL (a.k.a. Oracles OpenJDK) version and the commercially licensed (a.ka. Oracle JDK) version?

If you are a JMS app on Red Hat Linux (IBM!) in JBOSS (owned by RedHat, which is owned by IBM!) calling MQ (IBM!), what would the most straight forward way for the new app to use a supported JRE? Does installing (just a self-extracting jar file) the MQ Resource Adapter on the JBOSS server provide the IBM JRE for the app to use? If yes, this would be ideal. Why should they go hunting for some OpenJDK version from who knows what 3rd party vendor? Unless their app has its own dependency on some specific flavor, I guess.

I thought this was good enough to bookmark as I research this topic:
https://blog.joda.org/2018/08/java-is-still-available-at-zero-cost.html


(Java and I are frequently on non speaking terms. Apologies if the questions aren't precise.)
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Peter Potkay
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fjb_saper
PostPosted: Wed Jun 19, 2019 9:14 pm Post subject: Reply with quote

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Joined: 18 Nov 2003
Posts: 20025
Location: LI,NY

PeterPotkay wrote:

If you are a JMS app on Red Hat Linux (IBM!) in JBOSS (owned by RedHat, which is owned by IBM!) calling MQ (IBM!), what would the most straight forward way for the new app to use a supported JRE? Does installing (just a self-extracting jar file) the MQ Resource Adapter on the JBOSS server provide the IBM JRE for the app to use? If yes, this would be ideal. Why should they go hunting for some OpenJDK version from who knows what 3rd party vendor? Unless their app has its own dependency on some specific flavor, I guess.

I thought this was good enough to bookmark as I research this topic:
https://blog.joda.org/2018/08/java-is-still-available-at-zero-cost.html


(Java and I are frequently on non speaking terms. Apologies if the questions aren't precise.)

I think the real question here would be can you run JBOSS on an IBM JDK?
The IBM JDK might not be free but should ensure all compatibility problems for IBM MQ are met.

Now if you go for a non IBM JDK, the OpenJDK would be the reference implementation going forward with Java 11 and the differences between the Oracle JDK and the Open JDK are few and far between. (which won't help if your code is counting on any of those differences...)

Hope it helps
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rekarm01
PostPosted: Thu Jun 20, 2019 6:33 am Post subject: Re: IBM MQ and OpenJDKs Reply with quote

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Joined: 25 Jun 2008
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PeterPotkay wrote:
Does IBM support any version of OpenJDK, from any vendor, for use with IBM MQ Clients, specifically the Resource Adapter?

Using MQ v9.1.2 and Linux as an example, under 'Supported Software', IBM lists the following versions of Java for use with the MQ client, or MQ resource adapter:
  • IBM Runtime Environment, Java Technology Edition, v7.0 - v8.0.5.0
  • Oracle Java SDK/JRE/JDK, v7.0 - v8.0
And it only supports the IBM JRE when "the SDK is supplied with an IBM product", which seems to suggest that the MQ client would also need to be compiled using an IBM Java compiler, in order to run in an IBM JRE.

PeterPotkay wrote:
I can't find anything that says it supports any specific flavor/version, or what criteria an OpenJDK must meet to be used with IBM MQ.

There's a lot more variablity with OpenJDK, because anybody can take the source, optionally modify it, and then create their own build, (for better or worse). That opens up a few questions about any given build, such as: "How was it modified?"; "How was it built?"; or "Is it complete?"; and probably the most important question, "Did IBM test it?". Even if it is "functionally identical aside from some cosmetic and packaging differences", IBM is not likely to support any build that it didn't specifically test for.
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