Kotlin for Enterprise Applications using Java EE

Writing a Publisher class

We write a Publisher class to publish a message to the topic:

class Publisher {    @Inject    private lateinit var initialContext: InitialContext    fun publishMessage(message: String) {        val topic = initialContext.lookup("jms/Topic") as Topic        val connectionFactory = initialContext.lookup("jms/__defaultConnectionFactory")                                     as ConnectionFactory        connectionFactory.createContext()                .createProducer()                .send(topic, message)    }}

Again, this is similar to what we wrote in the Producer class.

We inject InitialContext using CDI, we look up the topic using JNDI, and we load connectionFactory. We then create JMSContext by invoking the createContext() function on the connectionFactory obtained. Using JMSContext, we create the producer instance ...