not able to remove message from jms activemq queue

Question

i am new to jms technology. I am using activeMQ console for monitoring queues. I am able create queue with message in it. But when I try to remove certain queue.. a exception is coming. Tried many things, but all in vein.. below is my code:

code

   BrokerService brokerService = new BrokerService();
        try {
            brokerService.start(true);
            brokerService.start();
            brokerService.autoStart();
            brokerService.setUseJmx(true);
            brokerService.addConnector("tcp://localhost:61616");
            Thread.sleep(10000);
            System.out.println("brokerService : "+brokerService.isStarted());
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        BrokerFacadeSupport facade=   new LocalBrokerFacade(brokerService);
        try {
            QueueViewMBean queue = facade.getQueue(queue_name);
            if(queue==null) {
                System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
            }
                    int count = this.jmsTemplate.browse(queue_name, new BrowserCallback<Integer>() {
                public Integer doInJms(final Session session, final QueueBrowser browser) throws JMSException {
                    Queue queue1 = browser.getQueue();
                    Enumeration enumeration = browser.getEnumeration();
                    int counter = 0;
                    while (enumeration.hasMoreElements()) {
                        Message msg = (Message) enumeration.nextElement();
                        msg.acknowledge();
                        ActiveMQTextMessage atm  = (ActiveMQTextMessage) msg;
                        atm.setDroppable(true);
                        atm.setReadOnlyProperties(false);
                        atm.setReadOnlyBody(false);
                        atm.acknowledge();
                        msg.setBooleanProperty("readOnlyProperties", false);
                                    msg.setBooleanProperty("readOnlyBody", false);
                                    msg.setBooleanProperty("droppable", true);
                        Enumeration enum_ = atm.getPropertyNames();
                        while(enum_.hasMoreElements()) {
                            String name  = (String) enum_.nextElement();
                            System.out.println("## : "+name);
                        }
                        try {
                            System.out.println("--"+atm.getJMSMessageID());
                            System.out.println();
                            queue.removeMessage(atm.getJMSMessageID());
                        }catch(Exception ex) {
                            ex.printStackTrace();
                        }
                        System.out.println(String.format("\tFound : %s", msg));
                        counter += 1;
                    }
                    return counter;
                }
            });
            queue.purge();
        }catch(Exception ex) {
            ex.printStackTrace();
        }

output

output to System.out.println(String.format("\tFound : %s", msg)); is :

Found : ActiveMQTextMessage {commandId = 5, responseRequired = true, messageId = ID:CRM-PC-50101-1528866712471-1:1:1:1:1, originalDestination = null, originalTransactionId = null, producerId = ID:CRM-PC-50101-1528866712471-1:1:1:1, destination = queue://testNexus, transactionId = null, expiration = 0, timestamp = 1528866713408, arrival = 0, brokerInTime = 1528866713410, brokerOutTime = 1529047482640, correlationId = null, replyTo = null, persistent = true, type = null, priority = 4, groupID = null, groupSequence = 0, targetConsumerId = null, compressed = false, userID = null, content = org.apache.activemq.util.ByteSequence@12b82970, marshalledProperties = org.apache.activemq.util.ByteSequence@49abe550, dataStructure = null, redeliveryCounter = 0, size = 0, properties = {_type=com.crm.jms.SampleObject}, readOnlyProperties = true, readOnlyBody = true, droppable = false, jmsXGroupFirstForConsumer = false, text = {"msg":"hello world"}}

final output console

==>   _type : com.crm.jms.SampleObject
--ID:Crm-PC-50101-1528866712471-1:1:1:1:1
java.lang.NullPointerException
    at com.crm.jms.controller.QueueController$1.doInJms(QueueController.java:171)
    at com.crm.jms.controller.QueueController$1.doInJms(QueueController.java:1)
    at org.springframework.jms.core.JmsTemplate$14.doInJms(JmsTemplate.java:1033)
    at org.springframework.jms.core.JmsTemplate.execute(JmsTemplate.java:484)
    at org.springframework.jms.core.JmsTemplate.browseSelected(JmsTemplate.java:1027)
    at org.springframework.jms.core.JmsTemplate.browse(JmsTemplate.java:989)
    at com.crm.jms.controller.QueueController.deleteQueue(QueueController.java:153)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
.
.
.
.
    Found : ActiveMQTextMessage {commandId = 5, responseRequired = true, messageId = ID:Crm-PC-50101-1528866712471-1:1:1:1:1, originalDestination = null, originalTransactionId = null, producerId = ID:Crm-PC-50101-1528866712471-1:1:1:1, destination = queue://testNexus, transactionId = null, expiration = 0, timestamp = 1528866713408, arrival = 0, brokerInTime = 1528866713410, brokerOutTime = 1529049245130, correlationId = null, replyTo = null, persistent = true, type = null, priority = 4, groupID = null, groupSequence = 0, targetConsumerId = null, compressed = false, userID = null, content = org.apache.activemq.util.ByteSequence@5b55f70f, marshalledProperties = org.apache.activemq.util.ByteSequence@3e116ae6, dataStructure = null, redeliveryCounter = 0, size = 0, properties = {_type=com.crm.jms.SampleObject}, readOnlyProperties = true, readOnlyBody = true, droppable = false, jmsXGroupFirstForConsumer = false, text = {"msg":"hello world"}}
java.lang.NullPointerException
    at com.crm.jms.controller.QueueController.deleteQueue(QueueController.java:181)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
.
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.
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It is impossible to correlate the stack-trace with the code you've pasted without line numbers. It would also help to have the entire com.crm.jms.controller.QueueController class to make more sense of the stack-trace. — Justin Bertram, Jun 18 '18 at 14:23
you see the problem I am getting is in this line: `QueueViewMBean queue = facade.getQueue(queueName);` ... here queue is `null`, so whether I call `removeMessage` or `purge` method, all giving `null pointer exception`. — JPG, Jun 19 '18 at 07:35

score 3 · Answer 1 · answered Jun 18 '18 at 14:05

3

Why do you acknowledge messages that you are browsing (and not consuming) ?

Enumeration enumeration = browser.getEnumeration();
...
Message msg = (Message) enumeration.nextElement();
msg.acknowledge();

As you noticed it, there is indeed no delete()/remove() method on javax.jms.Queue, but you can maybe reach the same results by just consuming the desired messages (still using the pure JMS API):

MessageConsumer consumer = session.createConsumer(myQueue, "JMSMessageID = '" + messageId + "'");
Message message = consumer.receive(TIMEOUT);
message.acknowledge();

answered Jun 18 '18 at 14:05

TacheDeChoco

3,683
1
14
17

you see the problem I am getting is in this line: `QueueViewMBean queue = facade.getQueue(queueName);` ... here queue is `null`, so whether I call `removeMessage` or `purge` method, all giving `null pointer exception`. – JPG Jun 19 '18 at 07:35
And which value has your 'queueName' variable ? – TacheDeChoco Jun 19 '18 at 09:08
1

That's exactly the point: what is the actual value of queueName when entering the method ? A wrong value may be the reason why the queue is not found. In particular the exact queueName required by the JMS api (eg session.createConsumer) might be different from the one required by the native ActiveMQ api (eg facade.getQueue). For instance: "queue/myqueue" vs "myqueue" – TacheDeChoco Jun 19 '18 at 19:20
1

see, I am able to get message id from that `queueName`.. then I wanted to delete that message from given queue. – JPG Jun 20 '18 at 07:28

score 1 · Answer 2 · answered Jun 15 '18 at 09:19

1

The problem is that you are not starting an BrokerService so the facade.getQueue(queueName) method will return null. Why? Because facade object don't know which active mq server you are asking for.

Of course you are getting some information about your message because you are connecting with an jmsTemplate to an running broker server.

Exceptions are thrown on queue.purge(); and queue.removeMessage(msg.getJMSMessageID()); because queue is null.

I would suggest removing the BrokerService and BrokerServiceFacade stuff and get the Queue object inside the callback by browser.getQueue() method from QueueBrowser argument.

answered Jun 15 '18 at 09:19

Marcin Bukowiecki

410
3
6

Ok, but `browser.getQueue()` object i.e. `javax.jms.Queue` does not have remove method available.. – JPG Jun 15 '18 at 09:43
also `brokerService.start()` has started the brokerService but `queue` is still null – JPG Jun 15 '18 at 10:09
Did you start the broker with `broker.setUseJmx(true)` and `broker.addConnector("tcp://localhost:PORT");` ? Because without specified `url` the broker will start withing your JVM. – Marcin Bukowiecki Jun 15 '18 at 13:20
sorry, friend, its still not initializing queue..Queue object is still `null` Anyways I have updated my question with all corrections that you made me to do..please, review/approve the code above to see if I have made it right..thanks for your efforts. – JPG Jun 16 '18 at 14:39

not able to remove message from jms activemq queue

2 Answers2