J2ME standalone AQ client

Question

hi all!
i'm working on developing a standalone client for a handheld device running under a J2ME/PersonalJava 3.1 environment connecting to oracle 10.2.0.1.0
my goal is to:
# create a topic subscriber that will handle notifications broadcast on the topic (obviously many devices will be subscribing to the topic)
# keep the client code as portable as possible by using JMS interfaces
these are the classes that i have in my classpath:
* $ORACLE_HOME/jdbc/lib/classes12.jar
* $ORACLE_HOME/jdk/jre/lib/ext/jta.jar
* $ORACLE_HOME/jlib/jndi.jar
* $ORACLE_HOME/rdbms/jlib/aqapi12.jar
* $ORACLE_HOME/rdbms/jlib/jmscommon.jar
here is a sample class to listen to the topic:
import oracle.jms.AQjmsOracleDebug;
import oracle.jms.AQjmsSession;
import oracle.jms.AQjmsTopicConnectionFactory;
import oracle.AQ.AQDriverManager;
import org.apache.log4j.Logger;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.ObjectMessage;
import javax.jms.Session;
import javax.jms.Topic;
import javax.jms.TopicConnection;
import javax.jms.TopicSession;
import javax.jms.TopicSubscriber;
import java.io.Serializable;
import java.net.InetAddress;
import java.sql.Connection;
import java.sql.DriverManager;
public class TopicAttachment implements MessageListener {
    private final Logger log = Logger.getLogger(getClass());
    private final Connection dbConnection;
    public TopicAttachment(Connection dbConnection) {
        this.dbConnection = dbConnection;
    public void attach() throws Exception {
        TopicConnection connection = AQjmsTopicConnectionFactory.createTopicConnection(dbConnection, true);
        connection.setClientID(InetAddress.getLocalHost().getHostAddress());
        TopicSession session = connection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
        Topic orderCounts = ((AQjmsSession) session).getTopic("STOREORD", "T_ORDER_COUNTS");
        TopicSubscriber subscriber = session.createSubscriber(orderCounts);
        subscriber.setMessageListener(this);
        connection.start();
    public void onMessage(Message message) {
        try {
            ObjectMessage om = (ObjectMessage) message;
            Serializable notification = om.getObject();
            log.info("Received notification: " + notification);
            // TODO: Handle notification in background thread
        } catch (Exception ex) {
            log.error("Failure processing notification", ex);
    public static void main(String[] args) throws Exception {
        System.setProperty("oracle.jms.useEmulatedXA", "false");
        System.setProperty("oracle.jms.useNativeXA", "false");
        AQDriverManager.disableOciAQ();
        AQjmsOracleDebug.setDebug(true);
        AQjmsOracleDebug.setTraceLevel(AQjmsOracleDebug.AQ_ORA_TR6);
        Class.forName("oracle.jdbc.driver.OracleDriver");
        TopicAttachment attachment = new TopicAttachment(DriverManager.getConnection(
                "jdbc:oracle:thin:@localhost:1521:xxxx", "storeord", "xxxx"));
        attachment.attach();
}there are two points where my portability constraints are violated, but that's ok for now.
when i run the example, this is what i get:
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsDBConnMgr ctor (user jdbc conn):  connection: oracle.jdbc.driver.T4CConnection@d1fa5
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsDBConnMgr.extraInit:  enter
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsDBConnMgr.extraInit:  The connection class: oracle.jdbc.driver.T4CConnection
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsDBConnMgr.extraInit:  exit
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsDBConnMgr ctor (user jdbc conn):  exit
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsConnectionn ctor (user jdbc conn):  connection: oracle.jdbc.driver.T4CConnection@d1fa5 type: 20
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsConnection.setCompliant:  Current <compliant> is set to:true
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsDBConnMgr.getConnection:  use the external connection with usage check
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsDBConnMgr.getConnection:  passed usage check, creating from exteranl connection
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsSession.constructor:  dbversion=10201
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsSession.setDBRatio:  enter
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsSession.setRatio:  The DB csid = 178
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsSession.setRatio:  exit
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsSession.inGlobalTrans:  entry
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsSession.inGlobalTrans:  oracle.jms.useEmulatedXA is off
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsSession.inGlobalTrans:  exit
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsSession.constructor1:  oci enabled = false
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsConnection:createTopicSession:  Created session
main  AQOracleSession.getQueue:  Secure queue table: NO
main  AQOracleQueue.getProperty:  return cached prop
main  AQOracleSession.getQueueTable:  Payload type: RAW
main  AQOracleSession.getQueueTable:  Secure queue table: NO
main [Mon Sep 08 15:12:57 CDT 2008] AQjmsSession.chopit:  TSUB_1_b2b5787a678d40f0a2e589f89e6348fc -> TSUB_1_b2b5787a678d40f0a2e589f
java.lang.NullPointerException
at oracle.jms.AQjmsSession.getAQJmsSelector(AQjmsSession.java:2550)
at oracle.jms.AQjmsSession.createDurableSubscriber(AQjmsSession.java:2520)
at oracle.jms.AQjmsSession.forceCreateOldSubscriber(AQjmsSession.java:2924)
at oracle.jms.AQjmsSession.createSubscriber(AQjmsSession.java:2240)
at com.containerstore.device.notification.TopicAttachment.attach(TopicAttachment.java:35)
at com.containerstore.device.notification.TopicAttachment.main(TopicAttachment.java:64)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)
Exception in thread "main" i've tried many different incarnations of this basic setup with the same results. it always fails with a NPE when creating the subscriber. i've even used the more AQ specific classes/methods like TopicReceiver with the same results.
is what i'm trying to accomplish even possible?
thanks!

Answer 1

Don't let the fact that I've been doing AQ for years and no one else has responded throw you. <g>
When I see things like this:
public static void main(String[] args) throws Exception {
        System.setProperty("oracle.jms.useEmulatedXA", "false");
        System.setProperty("oracle.jms.useNativeXA", "false");it is hard to not read it as Java.