HornetQ JMS Management API "listMessages" operation not working

[ajinkya.bambal]

I am using JMS Management API to manage HornetQ queues . I am not able to execute "listMessages" operation. My code snippet as follows:

   Queue managementQueue = HornetQJMSClient.createQueue(HornetQStringContstant.MANAGEMENT_QUEUE_NAME);

   // Create a QueueRequestor for the management queue

    QueueRequestor   requestor = new QueueRequestor((QueueSession) session, managementQueue);

    Message m = session.createMessage();

    Message reply = null;

   JMSManagementHelper.putOperationInvocation(m,

                                                    "jms.queue.exampleQueue",

                                                    "listMessages","");

  reply = requestor.request(m);

  boolean success = JMSManagementHelper.hasOperationSucceeded(reply);

  Map<String, Object> messageMap  = (Map<String, Object>) JMSManagementHelper.getResult(reply);

[jbertram]

Please provide enough information to actually understand what's happening, e.g.:

• What version of HornetQ are you using?
• Do you see any errors on the client or the server?
• Does "jms.queue.exampleQueue" exist on the server?  If so, how is it defined/deployed?

[ajinkya.bambal]

Hi Justin ,

Please find answers inline ,

1) I am using standalone HornetQ 2.3.0.Final version .

2) I dont see any error in server log but in client log following error came ,

Exception occured at listMessages [Ljava.lang.Object; cannot be cast to java.util.Map

java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to java.util.Map

3)I have defined example queue in hornetq-jms.xml as follows :

   <queue name="exampleQueue">

      <entry name="/queue/exampleQueue"/>

   </queue>

4) I have also added following Management related configuration in hornetq-configuration.xml ,

    a) Added ,

               <management-address>jms.queue.hornetq.management</management-address>

    b) under <security-settings> tag added ,

                             <security-setting match="jms.queue.hornetq.management">

                                <permission type="manage" roles="guest" />

                            </security-setting>

5) I also used JMS management API for "messageCount" (returns integer value) ,"removeMesage" (input : jmsMessageID , returns boolean) ,"removeMessages"(returns integer). But all are working fine except "listMessages"(Which ideally should return Map<String,Object> but it is returning Object) .

Please let me know if you need more inputs from me.

[jbertram]

Which ideally should return Map<String,Object> but it is returning Object

These are your fundamental problems:

• You expect the "listMessages" operation to return a Map<String,Object> when it in fact returns a Map<String,Object>[] (i.e. an array of Map<String,Object>).  See the JavaDoc.
• You interpret the message from the ClassCastException to indicate that "listMessages" is returning Object when it is in fact return Object[] (i.e. an array of Object).  "[Ljava.lang.Object" means an array of java.lang.Object.

Therefore your code should look something like this:

Object[] results = (Object[]) JMSManagementHelper.getResult(reply);

for (int i = 0; i < results.length; i++)
{
   Map<String, Object> result = (Map<String, Object>) results[i];
   System.out.println("Message: " + result);
}

[ajinkya.bambal]

Thanks Justin . It worked for me .