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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » Calling a static Method in a JAR file

Calling a static Method in a JAR file

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j_syed

Posted: Thu Oct 01, 2009 9:04 pm Post subject: Calling a static Method in a JAR file

Newbie

Joined: 01 Oct 2009
Posts: 1

Does anyone see a problem in calling a static method in a JAR file from a compute node. The JAR method posts a message into a JMS queue and then waits on another queue for the reply based on a correlation ID. I know there is a JMSQueue node in WMB but I am interested to know if there is a problem doing the logic in a Java JAR file. Please advise.

Vitor

Posted: Fri Oct 02, 2009 7:17 am Post subject: Re: Calling a static Method in a JAR file

Grand High Poobah

Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA

j_syed wrote:

I know there is a JMSQueue node in WMB but I am interested to know if there is a problem doing the logic in a Java JAR file. Please advise.

As a new poster, I'll warn you my Java is a bit dubious, so bear that in mind.

Problems I can see:

- you're reinventing the wheel; why not let WMB manage this? It's why you're paying the license fee for the software
- you could have problems if there are multiple threads running. Remember that WMB doesn't run in a JVM and spins up one for the compute node
- how does this method integrate with WMB's transactional control?
- how does this method signal WMB that a reply has not bee received, so that the flow can respond accordingly?

There may be other problems; not all of these may be problems.
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mqjeff

Posted: Fri Oct 02, 2009 7:38 am Post subject: Re: Calling a static Method in a JAR file

Grand Master

Joined: 25 Jun 2008
Posts: 17447

Vitor wrote:

- you could have problems if there are multiple threads running. Remember that WMB doesn't run in a JVM and spins up one for the compute node

No, that's not true.

Large portions of WMB these days are written in Java in the first place. Every EG is both a C++ Runtime and a JVM.

You certainly *can* use JMS from a JavaCompute node or from a static method called from a compute node.

But all of the rest of Vitor's responses do apply for why you shouldn't do this. The only reasonable cause for doing so is if you need to Get a message from a JMS queue in the middle of a flow - as there is not currently a JMSGet node.

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