Java Code for Sending and Receiving Messages to IBM MQ
Unsure of the optimal approach, is there a way to add and retrieve IBM MQ messages without an application server? Any advice on this matter would be appreciated. One potential solution may be to explore the sample code provided by IBM upon installation of MQ. By gaining proficiency in RabbitMQ techniques, it is possible that they can be translated to IBM MQ, thus allowing for the resolution of the initial inquiry.
Put and Get Messages to IBM MQ from java code
As a learner of IBM MQ, I aim to employ the most effective techniques for putting and retrieving messages from IBM MQ using Java code.
I attempted to solve the query, but I am uncertain if my approach is optimal. The question pertains to the process of sending and receiving IBM MQ messages without the involvement of an application server.
Can you provide me with some advice on that matter, if you don’t mind?
Explore the sample code included in the MQ installation provided by IBM.
Java and JMS MQ classes are available through sample sources located under the ‘MQ install dir\Tools’ directory on Windows.
The main method is declared with the access modifier «public» and the return type «void». It takes an array of String objects as its parameter and is named «args».
Connection connection = null; Session session = null; Destination destination = null; Destination tempDestination = null; MessageProducer producer = null; MessageConsumer consumer = null; try < JmsFactoryFactory ff = JmsFactoryFactory.getInstance(WMQConstants.WMQ_PROVIDER); JmsConnectionFactory cf = ff.createConnectionFactory(); cf.setStringProperty(WMQConstants.WMQ_HOST_NAME, "localhost"); cf.setIntProperty(WMQConstants.WMQ_PORT, 1414); cf.setStringProperty(WMQConstants.WMQ_CHANNEL, "SYSTEM.DEF.SVRCONN"); cf.setIntProperty(WMQConstants.WMQ_CONNECTION_MODE, WMQConstants.WMQ_CM_CLIENT); cf.setStringProperty(WMQConstants.WMQ_QUEUE_MANAGER, "QM1"); connection = cf.createConnection(); session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); destination = session.createQueue("queue:///Q1"); producer = session.createProducer(destination); long uniqueNumber = System.currentTimeMillis() % 1000; TextMessage message = session.createTextMessage("SimpleRequestor: Your lucky number yesterday was " + uniqueNumber); connection.start(); producer.send(message); >catch (JMSException jmsex) < jmsex.printStackTrace(); >> It appears that you have already asked a similar question thirty minutes ago, and you are eager to receive an answer. Therefore, let’s hope that this response will assist you in making progress.
The fundamental concepts of managing message queues remain consistent irrespective of the approach. As you are in the learning phase, I suggest you refer to this tutorial on RabbitMQ for gaining insights: RabbitMQ tutorial.
RabbitMQ is both costless and effortless to set up on your computer, enabling you to experiment with it and comprehend its workings with ease. The guide is ideal for beginners and contains thorough explanations throughout.
This should provide you with a comprehensive understanding of the methods utilized and the most effective strategies.
RabbitMQ appears to be more prevalent than IBM MQ, which means you can receive better assistance while familiarizing yourself with it.
After acquiring proficiency in RabbitMQ methods, it is expected that you can utilize them in IBM MQ. This would empower you to resolve your initial inquiry independently.
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How messaging fits into your code
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IBM MQ Message Listener
Can someone guide me on how to develop a message listener for IBM MQ? While I am familiar with implementing it through JMS specification, I am unsure about the process for IBM MQ. Would anyone happen to have any links or tips they could share? Thank you in advance.
While it is true that there exists a WMQ Java API, it should be noted that WMQ also provides support for JMS. Therefore, below are some helpful resources to begin with.
Check out this entry on IBM WebSphere Developer Technical Journal which discusses how to execute a Java program independently on WebSphere MQ V6.0.
In case you have installed the complete WMQ client instead of just downloading the jars, you will find a plethora of sample code already installed. The default location for these codes is either C:\Program Files\IBM\WebSphere MQ\tools\jms or /opt/mqm/samp based on the platform you are using.
Obtain the WMQ Client installation media from this source, keeping in mind that it is version 7 and not version 6. Although it is compatible with version 6’s queue manager, the latter has reached its end-of-life phase since September 2011. Therefore, it is advisable to use the v7 client for any new development and, if feasible, a v7 QMgr. Using both v7 versions offers numerous functional and performance improvements.
In case it’s required, the product manual can be obtained from here.
It’s important to note that when encountering a JMS exception, printing the linked exception is crucial. The need to do this is not specific to WMQ, but rather a characteristic of JMS. JMS exceptions have a multi-level data structure provided by Sun, with the most insightful information often found in the nested level. Fortunately, implementing this is a simple task that only requires a few lines of code.
try < . . code that might throw a JMSException . >catch (JMSException je) < System.err.println("caught "+je); Exception e = je.getLinkedException(); if (e != null) < System.err.println("linked exception: "+e); >else < System.err.println("No linked exception found."); >> With the aid of this technique, distinguishing a JMS error from a transport error becomes possible. For instance, a JMS security error could be a WMQ 2035, an issue with the JSSE configuration, or a lack of access to a file system component by the application. It is only worth investing substantial time examining the WMQ error logs for one of these errors, and the linked exception must be printed to determine which one it is.
Have a glance at the IBM assistance for creating Java applications based on WebSphere MQ.
IBM provides an API that enables communication with queues. Below is a sample of the API.
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 simple WebSphere MQ message, and write some text in UTF format.. MQMessage hello_world = new MQMessage(); hello_world.writeUTF("Hello World!"); // specify the message options. MQPutMessageOptions pmo = new MQPutMessageOptions(); // accept the // defaults, // same as MQPMO_DEFAULT // put the message on the queue system_default_local_queue.put(hello_world,pmo); // get the message back again. // First define a WebSphere MQ message buffer to receive the message into.. MQMessage retrievedMessage = new MQMessage(); retrievedMessage.messageId = hello_world.messageId; // 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 Uncertainty surrounds the location of IBM jars in the Maven repository’s base. Previously, I had to extract them from an IBM installation on my computer and store them in a local SVN repository. Currently, I am utilizing these jars.
com.ibm com.ibm.mq 5.3.00 compile com.ibm com.ibm.mq.pcf 5.3.00 compile com.ibm com.ibm.mqbind 5.3.00 compile com.ibm com.ibm.mqjms 5.3.00 compile Please review the example given earlier.
Specifically at the lines
MQGetMessageOptions gmo = new MQGetMessageOptions(); system_default_local_queue.get(retrievedMessage, gmo); You have the option to set a specific waiting time for the get method to avoid MQRC_NO_MSG_AVAILABLE exception, or you can choose to wait infinitely.
gmo.waitInterval= qTimeout; gmo.options = MQC.MQGMO_WAIT A thread can be generated to continuously search for fresh messages and then transfer them to a processor. The retrieval and storage operations don’t have to occur within the same application or thread.
I trust that this response has provided a satisfactory answer to your inquiry.
Prior to receiving the message, you have the option to specify as follows while in the loop.
gmo.options = MQC.MQGMO_WAIT gmo.waitInterval = MQConstants.MQWI_UNLIMITED; The loop is programmed to hold until a message appears in the queue, resembling MessageListerner in my opinion.
Java — IBM MQ Message Listener, By default, these will live in C:\Program Files\IBM\WebSphere MQ\tools\jms or /opt/mqm/samp depending on your platform. If you need the …
IBM MQ connection using Java
Encountering an issue while trying to connect to IBM MQ, as I cannot access the createContext() function. The only option left is to use (JMSContext) cf.createConnection();, which unfortunately leads to an error message: «Exception in thread «main» java.lang.ClassCastException: com.ibm.mq.jms.MQConnection cannot be cast to javax.jms.JMSContext at pushmsgs.main(pushmsgs.java:55)».
import com.ibm.msg.client.jms.JmsConnectionFactory; import com.ibm.msg.client.jms.JmsFactoryFactory; import com.ibm.msg.client.wmq.WMQConstants; import javax.jms.*; public class pushmsgs < // System exit status value (assume unset value to be 1) private static int status = 1; // Create variables for the connection to MQ private static final String HOST = "22.188.133.100"; // Host name or IP address private static final int PORT = 3415; // Listener port for your queue manager private static final String CHANNEL = "DEV.APP.SVRCONN"; // Channel name private static final String QMGR = "SITQUEUEMGR"; // Queue manager name // private static final String APP_USER = "app"; // User name that application uses to connect to MQ //private static final String APP_PASSWORD = "_APP_PASSWORD_"; // Password that the application uses to connect to MQ private static final String QUEUE_NAME = "TESTQUEUE.MQAPP.REQ.RCV"; // Queue that the application uses to put and get messages to and from /** * Main method * * @param args */ public static void main(String[] args) < // Variables JMSContext context = null; Destination destination = null; JMSProducer producer = null; JMSConsumer consumer = null; try < // Create a connection factory JmsFactoryFactory ff = JmsFactoryFactory.getInstance(WMQConstants.WMQ_PROVIDER); JmsConnectionFactory cf = ff.createConnectionFactory(); // Set the properties cf.setStringProperty(WMQConstants.WMQ_HOST_NAME, HOST); cf.setIntProperty(WMQConstants.WMQ_PORT, PORT); cf.setStringProperty(WMQConstants.WMQ_CHANNEL, CHANNEL); cf.setIntProperty(WMQConstants.WMQ_CONNECTION_MODE, WMQConstants.WMQ_CM_CLIENT); cf.setStringProperty(WMQConstants.WMQ_QUEUE_MANAGER, QMGR); // cf.setStringProperty(WMQConstants.WMQ_APPLICATIONNAME, "JmsPutGet (JMS)"); //cf.setBooleanProperty(WMQConstants.USER_AUTHENTICATION_MQCSP, true); // cf.setStringProperty(WMQConstants.USERID, APP_USER); //cf.setStringProperty(WMQConstants.PASSWORD, APP_PASSWORD); //cf.setStringProperty(WMQConstants.WMQ_SSL_CIPHER_SUITE, "*TLS12"); // Create JMS objects context = (JMSContext) cf.createConnection(); destination = context.createQueue("queue:///" + QUEUE_NAME); long uniqueNumber = System.currentTimeMillis() % 1000; TextMessage message = context.createTextMessage("Your lucky number today is " + uniqueNumber); producer = context.createProducer(); producer.send(destination, message); System.out.println("Sent message:\n" + message); context.close(); recordSuccess(); >catch (JMSException jmsex) < recordFailure(jmsex); >System.exit(status); > // end main() /** * Record this run as successful. */ private static void recordSuccess() < System.out.println("SUCCESS"); status = 0; return; >/** * Record this run as failure. * * @param ex */ private static void recordFailure(Exception ex) < if (ex != null) < if (ex instanceof JMSException) < processJMSException((JMSException) ex); >else < System.out.println(ex); >> System.out.println("FAILURE"); status = -1; return; > /** * Process a JMSException and any associated inner exceptions. * * @param jmsex */ private static void processJMSException(JMSException jmsex) < System.out.println(jmsex); Throwable innerException = jmsex.getLinkedException(); if (innerException != null) < System.out.println("Inner exception(s):"); >while (innerException != null) < System.out.println(innerException); innerException = innerException.getCause(); >return; > > 
Included both JMS mvn and com.ibm.mq.allclient dependencies.
The reason for the issue is that you are assigning the incorrect object to the variable.
context = (JMSContext) cf.createConnection(); I am unsure of your intention as a connection and context are not interchangeable.
Connection conn = cf.createConnection("MyUserId", "mypassword"); Take a look at my sample named MQTestJMS51.
Ibm mq — How to read IBM MQ Message based on, The IBM MQ standard for request/reply scenario is for the request application to: save the Message Id after the MQPUT to the server application ; …