JMS: can I access SAP messages from extenal Java

Question

- Can I access SAP Messages from an external (non-SAP) java program?
- Do I use JNDI or can I call using a jar file from my java invocation?
- Do I have to define a queue (or does SAP JMS have queues)
- What port do I use?
Thanks

Answer 1

Hi John,
> - Can I access SAP Messages from an external
> (non-SAP) java program?
>
Yes, you can use the JMS provider on the Web AS from a standalone java program.
> - Do I use JNDI or can I call using a jar file from
> my java invocation?
You connect your remote java client to the server by getting an InitialContext. The you lookup the JMS resources (such as Topic- or Queue ConnectionFactory, etc.) from the JNDI. You can have a look at <a href="http://help.sap.com/saphelp_nw04/helpdata/en/25/bf8f44540c469abc19fb6ac3ac7885/frameset.htm">this</a> page for more info.
>
> - Do I have to define a queue (or does SAP JMS have
> queues)
>
The JMS Provider on the Web AS provides default connection factories that you can use to create a topic ot queue. The lookup strings you have to use are
jmsfactory/default/TopicConnectionFactory
for topics and
jmsfactory/default/QueueConnectionFactory
for queues.
> - What port do I use?
>
You use the P4 port (50004 by default for instance number 00) when obtaining the InitialContext with this code:
java.util.Properties properties = new Properties();
// set the properties of the connection
properties.put("Context.INITIAL_CONTEXT_FACTORY", "com.sap.engine.services.jndi.InitialContextFactoryImpl");
properties.put(Context.PROVIDER_URL, "<Server_Host>:<p4_port>");
properties.put("Context.SECURITY_PRINCIPAL", "Administrator");
properties.put("Context SECURITY_CREDENTIALS", "admin_password");
// start initial context with the properties specified
InitialContext context = new InitialContext(properties);
Hope that helps!