Differences between calling Java from Qshell and RPG?

I have a set of classes that extract from a database and send the data via
an MQ message.
When I execute these classes from Qshell, everything's fine and the message
gets sent. However, when I execute the classes from an ILE RPG program, I
get an MQ connection error.

I can confirm:
1. The classpath is identical in both cases
2. The call interface signatures are the same (constructor and other
methods)
3. There is only one version of this set of classes.

My RPG H spec is:
H THREAD(*SERIALIZE) dftactgrp(*no) actgrp('test')

I've followed this in debug from the RPG call and within this snippet:

// Create MQ connection
factory = new MQConnectionFactory();
factory.setQueueManager(queueManager);
destination = new MQQueue(queue);
connection = factory.createConnection(); 

An exception is thrown on attempting to create the connection. The variables
queue & queueManager appear to be populated ok. 

Does anyone know of a possible cause for this? It seems like an environment
set up problem but not completely sure as I'm new to combining RPG and Java.

Also, for an RPG call, is there a way that I redirect the display output
that I get in Qshell: System.out.println and exceptions to a file?

Thanks,

Keith


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