There are several ways to connect to IBM MQ:-

• com.ibm.mq.MQQueueManager
• com.ibm.mq.jms.MQQueueConnectionFactory
• com.ibm.msg.client.jms.JmsConnectionFactory

This article shows you how to connect with Spring’s JmsTemplate.

CONNECTIVITY INFO

Typically, the MQ admin will provide the following connectivity info that allows you to connect to MQ:-

• Queue manager name, ex: MY.QUEUE.MANAGER
• Host name, ex: server.com
• Port, ex: 1415
• Channel name, ex: MY.SSL.CHANNEL
• SSL Cipher Suite, ex: SSL_ECDHE_RSA_WITH_AES_128_GCM_SHA256
• User, ex: user
• Password, ex: password
• Queue name, ex: MY.QUEUE

DEPENDENCY

Add the following dependency:-

dependencies {
  compile 'com.ibm.mq:mq-jms-spring-boot-starter:2.1.1'
}

SPRING CONFIGURATION

While the connectivity info can be hardcoded in Spring Boot’s application.properties, it’s probably more logical to use Spring @Configuration to dynamically set the values especially dealing with credential.

So, create a Spring configuration that looks something like this:-

// while all the value are hardcoded here for simplicity sake, you can inject
// sensitive values from DB, through <code>Environment</code>, etc.
@EnableJms
@Configuration
class JmsConfig {
  // Adding @Primary will force Spring Boot to use this bean
  // instead of the one provided by the dependency 
  @Primary
  @Bean
  MQConfigurationProperties mqConfigurationProperties() {
    System.setProperty('javax.net.ssl.keyStore', '/path/to/keystore.jks')
    System.setProperty('javax.net.ssl.keyStorePassword', 'XXXXXXX')

    return new MQConfigurationProperties(
      queueManager: 'MY.QUEUE.MANAGER',
      channel: 'MY.SSL.CHANNEL',
      connName: 'server.com(1415)',
      user: 'user',
      password: 'password',
      userAuthenticationMQCSP: true,
				
      // If the provided SSL cipher suite begins with "SSL", 
      // replace it with "TLS" instead.
      // SSL_* is IBM JRE CipherSuite name.
      // TLS_* is Oracle JRE CipherSuite name. 
      sslCipherSuite: 'TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256',
				
      // true - if using IBM JRE
      // false - if using non-IBM JRE, ex: Oracle, OpenJDK, etc
      useIBMCipherMappings: false
    )
  }
}

USING JMS TEMPLATE

Finally, to listen to the given queue, it is as easy as autowiring JmsTemplate and start using it.

@Autowired
JmsTemplate jmsTemplate

...

final Message message = jmsTemplate.receive('MY.QUEUE')
println message