org.apache.activemq.artemis.jms.example.JMSAutoCloseableExample Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of artemis-jms-auto-closeable-example Show documentation
The newest version!
/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.activemq.artemis.jms.example;

import javax.jms.*;
import javax.naming.InitialContext;

import org.apache.activemq.artemis.common.example.ActiveMQExample;

/**
 * A simple JMS example that shows how AutoCloseable is used by JMS 2 resources.
 */
public class JMSAutoCloseableExample extends ActiveMQExample
{
   public static void main(final String[] args)
   {
      new JMSAutoCloseableExample().run(args);
   }

   @Override
   public boolean runExample() throws Exception
   {
      InitialContext initialContext = null;
      try
      {
         // Step 1. Create an initial context to perform the JNDI lookup.
         initialContext = new InitialContext();

         // Step 2. Perfom a lookup on the queue
         Queue queue = (Queue)initialContext.lookup("queue/exampleQueue");

         // Step 3. Perform a lookup on the Connection Factory
         ConnectionFactory cf = (ConnectionFactory)initialContext.lookup("ConnectionFactory");

         // Step 4.Create a JMS Context using the try-with-resources statement
         try
         (
            JMSContext jmsContext = cf.createContext()
         )
         {
            // Step 5. create a jms producer
            JMSProducer jmsProducer = jmsContext.createProducer();

            // Step 6. Try sending a message, we don't have the appropriate privileges to do this so this will throw an exception
            jmsProducer.send(queue, "this message will fail security!");
         }
         catch(JMSRuntimeException e)
         {
            //Step 7. we can handle the new JMSRuntimeException if we want or let the exception get handled elsewhere, the
            //JMSCcontext will have been closed by the time we get to this point
            System.out.println("expected exception from jmsProducer.send: " + e.getMessage());
         }

         return true;
      }
      finally
      {
         // Step 8. Be sure to close our Initial Context, note that we don't have to close the JMSContext as it is auto closeable
         //and closed by the vm
         if (initialContext != null)
         {
            initialContext.close();
         }
      }
   }
}