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This section describes how to configure WSO2 ESB to listen to a JMS Queuequeue.

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The following sections walk you through the steps below to configure WSO2 the ESB to listen to a JMS queue, consume messages, and send them the messages to a HTTP backback-end service.

Table of Contents

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Prerequisites

Configure WSO2 ESB with Apache ActiveMQ, and set up the JMS listener. For instructions,

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see Configure with ActiveMQ.
Start the ESB server.

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	sample
	sample

Configuring the sample

Create a proxy service with the following configuration.

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For information on how to create a proxy service

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, see

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Creating a Proxy Service.

Code Block

language	xml

<proxy xmlns="http://ws.apache.org/ns/synapse" name="JMStoHTTPStockQuoteProxy" transports="jms">
       <target>
           <inSequence>
               <property action="set" name="OUT_ONLY" value="true"/>
           </inSequence>
           <endpoint>
               <address uri="http://localhost:9000/services/SimpleStockQuoteService"/>
           </endpoint>

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<outSequence/>

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</target> </proxy>
Tip
title

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Tip
The OUT_ONLY property is set to true to indicate that message exchange is one-way.
You can make the proxy service a JMS listener by setting

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the transport as jms. Once the JMS transport is enabled for a proxy service, the ESB

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starts listening on a JMS queue with the same name as the proxy service.

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If you take a look at the sample configuration above,

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the ESB listens to a JMS queue named JMStoHTTPStockQuoteProxy. To make the proxy service listen to a different JMS queue, define the transport.jms.Destination parameter with the name of the destination queue.

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Testing the sample

To test this sample, you

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need an HTTP back-end service. Let's use the SimpleStockQuoteService as the back-end service

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and test the sample.

Follow the steps below to build and deploy the SimpleStockQuoteService:
1. Open a command prompt (or a shell in Linux) and go to the <ESB_HOME>/samples/axis2Server/src/SimpleStockQuoteService directory.
2. Run ant.
Follow the steps below to start the Axis2 server:
1. Open a command prompt (or a shell in Linux) and go to the <ESB_HOME>/samples/axis2Server directory.
2. Execute one of the following commands
  - On Windows: axis2server.bat
  - On Linux/Solaris: ./axis2server.sh

Send a message to the ActiveMQ queue by executing the following command from the <ESB_HOME>/samples/axis2Client folder directory.

Code Block

language	xml

ant stockquote -Dmode=placeorder -Dtrpurl="jms:/JMStoHTTPStockQuoteProxy?transport.jms.ConnectionFactoryJNDIName=QueueConnectionFactory&java.naming.factory.initial=org.apache.activemq.jndi.ActiveMQInitialContextFactory&java.naming.provider.url=tcp://localhost:61616&transport.jms.ContentTypeProperty=Content-Type&transport.jms.DestinationType=queue"

ESB will read the message from the ActiveMQ queue and send it to the back-end service.

Analyzing the output

You will see the following response

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on the Axis2 Server console:

Code Block

language	xml

Fri Dec 16 10:21:11 GST 2016 samples.services.SimpleStockQuoteService  :: Accepted order #1 for : 7424 stocks of IBM at $ 156.74347214873563

By analyzing the output you can understand that the ESB has read the message from the ActiveMQ queue and sent it to the back-end service.

Two-way HTTP

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back-end

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call

In addition to one-way invocations, WSO2 an ESB proxy service can listen to the queue, pick up a message and do a two-way HTTP call as well. It allows the response to be delivered to a queue specified by the client. This is done by specifying a ReplyDestination element when placing sending a request message to a JMS queue. The scenario is depicted two-way HTTP call is illustrated in the diagram below.:

Image RemovedImage Added

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You can have a proxy service similar to the following to simulate

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two-way invocation

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:

Code Block

language	html/xml

<proxy xmlns="http://ws.apache.org/ns/synapse"
       name="Proxy1"
       transports="jms"
       startOnLoad="true"
       trace="disable">
   <description/>
   <target> 
      <inSequence>
         <send>
            <endpoint>
               <address uri="http://localhost:9000/services/SimpleStockQuoteService"/>
            </endpoint>
         </send>
      </inSequence>

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<outSequence/>

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</

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target>
   <parameter name="transport.jms.ContentType">
      <rules>
         <jmsProperty>contentType</jmsProperty>
         <default>text/xml</default>
      </rules>
   </parameter>
</proxy>

Info

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title	Note

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In two-way JMS scenarios the OUT_ONLY property is not used.

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Execute the following command from the <ESB_HOME>/samples/axis2Client

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directory.

Tip

title	Tip

See how the transport.jms.ReplyDestination element is specified.

Code Block

language	xml

ant stockquote -Dsymbol=WSO2 -Dtrpurl="jms:/JMStoHTTPStockQuoteProxy?transport.jms.ConnectionFactoryJNDIName=QueueConnectionFactory&java.naming.factory.initial=org.apache.activemq.jndi.ActiveMQInitialContextFactory&java.naming.provider.url=tcp://localhost:61616&transport.jms.ContentTypeProperty=Content-Type&transport.jms.DestinationType=queue&transport.jms.ReplyDestination=ResponseQueue"

You can view the responses from the back-end service in the ResponseQueue by accessing the ActiveMQ management console

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via http://0.0.0.0:8161/admin , and using admin as both the username and password.

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Defining

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the content type of incoming JMS messages

By default, WSO2 ESB considers all messages consumed from a queue as a SOAP message. To consider accept messages consumed from a queue as in a different format, define the transport.jms.ContentType parameter with the respective content type as a proxy service parameter.

To demonstrate this, we have modified the above configuration as To define the content type of incoming JMS messages, you can modify the proxy service that you created above as follows:

Code Block

 <proxy xmlns="http://ws.apache.org/ns/synapse" name="JMStoHTTPStockQuoteProxy" transports="jms">
       <target>
           <inSequence>
               <property action="set" name="OUT_ONLY" value="true"/>
               <send>
                   <endpoint>
                       <address uri="http://localhost:9000/services/SimpleStockQuoteService"/>
                   </endpoint>
               </send>
           </inSequence>
           <outSequence>
               <send/>
  <outSequence/>
        </outSequence>
       </target>
       <parameter name="transport.jms.ContentType">
           <rules>
               <jmsProperty>contentType</jmsProperty>
               <default>application/xml</default>
           </rules>
       </parameter>
       <parameter name="transport.jms.Destination">MyJMSQueue</parameter>
   </proxy>

Anchor

	differentQueueName
	differentQueueName

Tip

title	Proxy Service ConfigurationTip

You can specify a different content type within the transport.jms.ContentType parameter. In the sample configuration above, the content type is defined is as application/xml.

If you want the proxy service to listen to a queue where the queue name is different from the proxy service name, you can specify the queue name using the transport.jms.Destination parameter. In the sample configuration above the ESB listens to a JMS queue named MyJMSQueue.

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Key

Prerequisites

Configuring the sample

Testing the sample

Analyzing the output

Two-way HTTP

back-end

call

Defining

the content type of incoming JMS messages