JMS has messages pending in the queue

Question

Hi, I created a JMS queue to hold some messages, then two message driven bean each take a message from the queue and use JavaMail API 1.2 to send an email out. But somehow, after a while, say, a couple of weeks, there will be about 20 messages pending the queue causing the queue hanging forever. Does anybody know what cause this JMS queue pending? Or is there anything wrong with this design? Thank you very much.

Answer 1

No, Acknowledgement is sending successfully, no excpeption is raising, in finally it is got acknowledged.
here is code block,
public void sendObject(Serializable message) throws JMSException
try {
HelperMethods.logDebugMessage("begin sendObject " + System.currentTimeMillis(),
this.getClass().getName(), "sendObject");
ObjectMessage objectMessage = getQueueSession().createObjectMessage();
objectMessage.clearBody();
objectMessage.setObject(message);
getQueueSender().send(objectMessage);
HelperMethods.logDebugMessage("sent sendObject " +System.currentTimeMillis(),
this.getClass().getName(), "sendObject");
getQueueSession().commit();
catch (Exception e) {
HelperMethods.logDebugMessage("Exception" + e.getMessage(),
this.getClass().getName(), "sendObject");
throw new JMSException(e.getMessage());
public void onMessage(Message message) {
ObjectMessage objectMessage = (ObjectMessage) message;
AttachmentFileUtil attachUtil = new AttachmentFileUtil();
try {
HelperMethods.logDebugMessage("received write sendObject msg " +
System.currentTimeMillis(),
this.getClass().getName(), "onMessage");
if (message instanceof ObjectMessage) {
HelperMethods.logDebugMessage("about to process write sendObject msg " +
System.currentTimeMillis(),
this.getClass().getName(), "onMessage");
AttachmentInfoBean attachment = (AttachmentInfoBean)
objectMessage.getObject();
HelperMethods.logDebugMessage("processed the write sendObject msg " +
System.currentTimeMillis(),
this.getClass().getName(), "onMessage");
HelperMethods.logDebugMessage("writing the sendObject msg to disk " +
System.currentTimeMillis(),
this.getClass().getName(), "onMessage");
// Here we are calling attachment bean, which uploads the file into file server
     attachUtil.writeContents(attachment);
     HelperMethods.logDebugMessage("After writing the sendObject msg to disk ",
                                                       this.getClass().getName(), "onMessage");
          HelperMethods.logDebugMessage("After Commiting Session " +
                    System.currentTimeMillis(),
                    this.getClass().getName(), "onMessage");
HelperMethods.logDebugMessage(
"finished writing the sendObject msg to disk " +
System.currentTimeMillis(), this.getClass().getName(), "onMessage");
else {
HelperMethods.logDebugMessage(
"oops! no ObjectMessage was received" +
message.getClass(), this.getClass().getName(), "onMessage");
throw new NowException("not an ObjectMessage was received" +
message.getClass());
catch (Exception ex) {
ex.printStackTrace();
HelperMethods.logDebugMessage("Exception" + ex.getMessage(),
this.getClass().getName(), "onMessage");
finally {
try {
HelperMethods.logDebugMessage("acknowledging the message",
this.getClass().getName(), "onMessage");
objectMessage.acknowledge();
catch (JMSException ex) {
ex.printStackTrace();
HelperMethods.logDebugMessage("JMSException" + ex.getMessage(),
this.getClass().getName(), "onMessage");
This is my production problem, please suggest me ASAP.
Regards,
Murthy Patnaik