Develop Reference

Java WSS Connection Could not create transport exception

I'm so stuck about this.
I want to subscribe an ActiveMQ topic. ActiveMQ works on Centos machine, NOT LOCALHOST. I can consume messages with tcp, http protocols. Code;
public static void main(String[] args) throws JMSException {
PropertyUtils.loadPropertyFile();
Properties receiverProperties = PropertyUtils.getreceiverProperties();
// URL of the JMS server
String url = (String) receiverProperties.get("receiver.connection.url");
// Name of the queue we will receive messages from
String subject = (String) receiverProperties.get("receiver.topic.name");
// Getting JMS connection from the server
ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);
Connection connection = connectionFactory.createConnection();
connection.start();
// Creating session for getting messages
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Getting the topic
Destination destination = session.createTopic(subject);
// MessageConsumer is used for receiving (consuming) messages
MessageConsumer consumer = session.createConsumer(destination);
Message message = null;
// Here we receive the message.
while (true) {
message = consumer.receive();
if (message instanceof TextMessage) {
TextMessage textMessage = (TextMessage) message;
System.out.println("Received message '" + textMessage.getText() + "'");
}
}
// We will be using TestMessage in our example. MessageProducer sent us a
// TextMessage
// so we must cast to it to get access to its .getText() method.
// connection.close();
}
I want to use wss protocol. This is a must for me. When I changed url with wss://host:port getting;
Could not create Transport. Reason: java.io.IOException: createTransport() method not implemented!
So I checked the alternatives. People figure this out with Stomp over WS. My first achievement is wss connection.
Any recommendation will be appreciated!

The exception you're seeing is expected because the OpenWire JMS client you're using doesn't support WebSocket connections, and it doesn't really need to. WebSocket connections are really only relevant for clients running in a limited environment like a web browser. Web browsers don't support running Java clients.
If you really want to use STOMP over WebSockets then you'll have to use a STOMP client implementation that supports WebSockets (most do).
Keep in mind that ActiveMQ is a broker. It does not supply clients for all the protocols it supports. It only provides a JMS client because it is required in order to implement JMS. STOMP, for example, is a standardized protocol and anyone can implement a client which will work with any broker implementing STOMP. There are lots of STOMP client implementations available written in many different languages for many different platforms. Any good search engine should help you find one to fit your needs.

Messages with persistence get stuck in ActiveMQ embedded in Tomcat

I am trying to integrate ActiveMQ within Tomcat. To that end, I used this tutorial (a little outdated, I know, but the best I found). I created a servlet that instantiates and starts a broker:
try {
broker = new BrokerService();
broker.addConnector("tcp://localhost:61616");
broker.start()
} catch (final Exception e) {
e.printStackTrace();
}
I then created a simple Hello World example with a single producer sending a persisted message to a queue and a consumer retrieving the message, which failed. Both, producer and consumer, were able to connect to ActiveMQ and the queue but the consumer did not receive any message. However, after restarting Tomcat (and consequently the broker), the consumer received the message previously sent. Any newly created messages were again stuck.
I tried some non-persisted messages, which all arrived as expected. When sending a combination of persisted and non-persisted messages, the non-persisted ones arrived immediately and the persisted ones required a restart.
This is my (very basic) code for the producer and consumer:
final ConnectionFactory conFactory = (ConnectionFactory) jndi.lookup("connectionFactory");
final Connection connection = conFactory.createConnection();
connection.start();
final Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
final Destination destination = (Destination) jndi.lookup("MyQueue");
final MessageProducer producer = session.createProducer(destination);
producer.setDeliveryMode(DeliveryMode.PERSISTENT);
final TextMessage message = session.createTextMessage("Hello World!");
producer.send(message);
connection.close();
final ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://localhost:61616");
connectionFactory.setTrustAllPackages(true);
final Connection connection = connectionFactory.createConnection();
connection.start();
final Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
final Destination destination = session.createQueue("APP.JMS.QUEUE");
final MessageConsumer consumer = session.createConsumer(destination);
final Message message = consumer.receive(1000);
System.out.println("Received: " + message);
consumer.close();
session.close();
connection.close();
I tried transacted, manual-acknowledge, and auto-acknowledge mode for the consumer. I also tried directly creating ConnectionFactory and Destination (as in the consumer code) as well as JNDI lookup (producer code). All yielded the same result.
I tried versions 5.15.12, 5.15.11, 5.14.5, 5.11.0 and 5.10.0.
Any pointers what I did wrong or where I can find a more recent tutorial? I am aware of the official docs regarding ActiveMQ and Tomcat but they seem to be missing the essential parts.

ActiveMQ connection Url for Blob Messages

I my application i have a remote ActiveMQ server and embedded ActiveMQ Server. When i send text messages it's working. But when i try to send Blob messages it throws a javax.jms.JMSException caused by java.net.MalformedURLException and java.lang.NumberFormatException.
My Broker URL
String broker1 = "tcp://localhost:7005?jms.blobTransferPolicy.defaultUploadUrl=http://localhost:61617";
where tcp://localhost:7005 is an embedded broker, and http://localhost:61617 is a remote broker.
My Producer code
File file=new File("C:/Users/xxx/Downloads/1234.txt");
ActiveMQConnection connection = ActiveMQConnection.makeConnection(broker);
connection.start();
ActiveMQSession session = (ActiveMQSession) connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Create the destination (Topic or Queue)
Destination destination = session.createQueue("test");
MessageProducer producer = session.createProducer(destination);
BlobMessage message = session.createBlobMessage(file);
System.out.println("upload started");
producer.send(message);
System.out.println("upload finished");
session.close();
connection.close();

URL should be like this embededbroker?jms.blobTransferPolicy.defaultUploadUrl=externalurl
In case of failure in embedded URL then external URL will be used.By default activemq provides a file server in this link http://(activemq server ip):portnumber/fileserver
For example if your activemq server running on localhost url should be http://localhost:8161/fileserver/
It
It supports HTTP or FTP or SCP or some other point-to-point protocol.

How To count Number of queues in ACTIVEMQ

I am trying to create an application which keeps on checking the number of queues up and running in activemq.
And Any way to check whether queue's are working or not i.e. if corrupted and not able to process messages.
Kindly suggest how to do it.
Thanks in Advance.

You can try following code.
public static void main(String[] args) throws Exception
{
// get the initial context
InitialContext ctx = new InitialContext();
// lookup the queue object
Queue queue = (Queue) ctx.lookup("queue/queue0");
// lookup the queue connection factory
QueueConnectionFactory connFactory = (QueueConnectionFactory) ctx.
lookup("queue/connectionFactory");
// create a queue connection
QueueConnection queueConn = connFactory.createQueueConnection();
// create a queue session
QueueSession queueSession = queueConn.createQueueSession(false,
Session.AUTO_ACKNOWLEDGE);
// create a queue browser
QueueBrowser queueBrowser = queueSession.createBrowser(queue);
// start the connection
queueConn.start();
// browse the messages
Enumeration e = queueBrowser.getEnumeration();
int numMsgs = 0;
// count number of messages
while (e.hasMoreElements()) {
Message message = (Message) e.nextElement();
numMsgs++;
}
System.out.println(queue + " has " + numMsgs + " messages");
// close the queue connection
queueConn.close();
}

You can ask for stats using the statistics plugin on the broker and the plain JMS api. I.e. to count the number of messages on FOO.BAR, send an empty message to ActiveMQ.Statistics.Destination.TEST.FOO and specify the replyTo header. In the response message, which is of typ MapMessage, you can find the message counter.
Another way is to browse only the first message of the queue using a simple queue browser (similar to the way praveen_programmer suggests) and check the timestamp of that message. If it's older than some threshold, you might have a problem with that consumer. I.e. no messages has been processed in the last hour/minute/day.
Yet another way is to use JMX, or preferably the jolokia REST/HTTP management api.
Just query the destination using http and you get a queue depth back:
To query the queue "q" on localhost, use the following api (you need to supply the user/password for the web console):
http://localhost:8161/api/jolokia/read/org.apache.activemq:type=Broker,brokerName=localhost,destinationType=Queue,destinationName=q

Take a look at Advisory messages. You need to enable them in your config , but you can get a lot of useful about your current activemq instances info through simple JMS messaging. http://activemq.apache.org/advisory-message.html I was using them to highlight slow producer and consumer scenarios.

MQ JMS simple download message

I am trying to implement a simple client that downloads messages from a MQ server. The MQ server already exists, and I have no access to it.
In all examples that I found online, it is used the "createQueue()" method, as such:
MQQueueConnectionFactory cf = new MQQueueConnectionFactory();
// Config
cf.setHostName("localhost");
cf.setPort(1414);
cf.setTransportType(JMSC.MQJMS_TP_CLIENT_MQ_TCPIP);
cf.setQueueManager("QM_thinkpad");
cf.setChannel("SYSTEM.DEF.SVRCONN");
MQQueueConnection connection = (MQQueueConnection) cf.createQueueConnection();
MQQueueSession session = (MQQueueSession) connection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
MQQueue queue = (MQQueue) session.createQueue("queue:///Q1");
MQQueueSender sender = (MQQueueSender) session.createSender(queue);
MQQueueReceiver receiver = (MQQueueReceiver) session.createReceiver(queue);
...
JMSMessage receivedMessage = (JMSMessage) receiver.receive(10000);
However, in my case I don't want to create a Queue, I just want to use an existing remote queue. Or I am wrong? What should I do?

createQueue() does not actually create an MQ Queue. It just creates an identifier for the queue , which can be used for subsequent calls, such as, in your case, createReceiver.