What are the minimum requirements for writing a Java client for MQSeries?

Here's another way ...

Using three jar files:

com.ibm.mq.jar
com.ibm.mqetclient.jar
com.ibm.mqjms.jar

      

        
        
        
      

    

Here is a sample code that will read the MQ post -

import com.ibm.mq.*;            // Include the WebSphere MQ classes for Java package

public class MQSample
{
  private String qManager = "your_Q_manager";  // define name of queue
                                               // manager to connect to.
  private MQQueueManager qMgr;                 // define a queue manager
                                               // object
  public static void main(String args[]) {
     new MQSample();
  }

  public MQSample() {
   try {

      // Create a connection to the queue manager
      qMgr = new MQQueueManager(qManager);

      // Set up the options on the queue we wish to open...
      // Note. All WebSphere MQ Options are prefixed with MQC in Java.
      int openOptions = MQC.MQOO_INPUT_AS_Q_DEF |
                        MQC.MQOO_OUTPUT ;

      // Now specify the queue that we wish to open,
      // and the open options...
      MQQueue system_default_local_queue =
              qMgr.accessQueue("SYSTEM.DEFAULT.LOCAL.QUEUE",
                               openOptions);

      // Define a WebSphere MQ message buffer to receive the message into..
      MQMessage retrievedMessage = new MQMessage();

      // Set the get message options...
      MQGetMessageOptions gmo = new MQGetMessageOptions(); // accept the defaults
                                                           // same as  MQGMO_DEFAULT
      // get the message off the queue...
      system_default_local_queue.get(retrievedMessage, gmo);

      // And prove we have the message by displaying the UTF message text
      String msgText = retrievedMessage.readUTF();
      System.out.println("The message is: " + msgText);
      // Close the queue...
      system_default_local_queue.close();
      // Disconnect from the queue manager

      qMgr.disconnect();
    }
      // If an error has occurred in the above, try to identify what went wrong
      // Was it a WebSphere MQ error?
    catch (MQException ex)
    {
      System.out.println("A WebSphere MQ error occurred : Completion code " +
                         ex.completionCode + " Reason code " + ex.reasonCode);
    }
      // Was it a Java buffer space error?
    catch (java.io.IOException ex)
    {
      System.out.println("An error occurred whilst writing to the message buffer: " + ex);
    }
  }
} // end of sample

      

        
        
        
      

    

Code taken from this SO answer .