Submit a RUNJVA job with different userID

Hello,

we are developing a Java batch process on the AS400, which is reading XML
messages from MQSeries, calls existing RPG programs to process the request
and submits the response XML message back to MQSeries. Due security reasons
the Java process has to run with a specific userID. This userID can not
signon to the system, it is only used to run different batch processes. (
this user is specified on SBMJOB command).   By doing so, we are receiving
java.io.Exception.

Is there a way to allow the JAVA program to have the capability to call
AS/400 RPG programs without logging on to the system?

Here is the JAVA code used to connect to the AS/400:

     String as400Name = "MyAS400";
     as400 = new AS400(as400Name);
     as400.connectService(AS400.COMMAND);

Here is the log from our JAVA job:

java.io.IOException
      com/ibm/as400/access/SocketContainerUnix.getSubstPassword([B[B)[B+8
(SocketContainerUnix.java:97)
      com/ibm/as400/access/CurrentUser.getUserInfo([B[B)[B+16
(CurrentUser.java:73)
      com/ibm/as400/access/AS400ImplRemote.getPassword([B[B)[B+34
(AS400ImplRemote.java:918)

com/ibm/as400/access/AS400ImplRemote.getConnection(IZ)Lcom/ibm/as400/access/AS400Server;

267 (AS400ImplRemote.java:859)
      com/ibm/as400/access/AS400ImplRemote.connect(I)V+13
(AS400ImplRemote.java:342)
      com/ibm/as400/access/AS400.connectService(I)V+87 (AS400.java:703)
      com/quixtar/oms/si/NMN8UPR.initialise(Ljava/util/Properties;)Z+0
(NMN8UPR.java:112)
      com/quixtar/oms/si/MQThread.<init>(Lcom/quixtar/oms/si/MQJob;I)V+0
(MQThread.java:16)
      com/quixtar/oms/si/MQJob.<init>([Ljava/lang/String;)V+0
(MQJob.java:74)
      com/quixtar/oms/si/MQJob.main([Ljava/lang/String;)V+0 (MQJob.java:36)


Thanks,

Attila