Passing messages from RPG back to java using Message Queue

Hi
I have a situation where i call a RPGLE program using PCML, this PCML has 3 parameters, 2 i send from Java to RPG and in 3 RPG returns back feedback along with a message in message queue.

This program works on our development machine, but one of of the AS400 machines, Java program is not getting value in message queue or in PCML field.

How do i debug this issue on this particular AS400 machine.

the code i am using to read message queue is as below
// clear the queue for any previous message
queue.remove();
// call RPG program
boolean rc = pcml.callProgram(pcmlFile);
//if call is successful
List messages = new ArrayList();
if (rc)
{
Enumeration e = queue.getMessages();

while (e.hasMoreElements())
{
QueuedMessage msg = (QueuedMessage) e.nextElement();
msg.load();
messages.add(msg.getID() + " " +
StringEscapeUtils.escapeJava(msg.getText()) + "|" +
StringEscapeUtils.escapeJava(msg.getHelp()));
}
}

A$HI$H