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WSO2 ESB's Java Message Service (JMS) transport allows you to easily send and receive messages to queues and topics of any JMS service that implements the JMS specification. The following sections describe how you can tune the JMS transport of WSO2 ESB for better performance.

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To adjust the values of these properties, you can modify the server startup script if you want to increase the available threads for all NHTTP and JMS transports (requires more memory), or create a jms.properties file if you want to increase the available threads just for the JMS transport. Both approaches are described below.

To increase the threads for

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NHTTP and JMS transports

1. Open the wso2server.sh or wso2server.bat file in your <ESB_HOME>/bin directory for editing.
2. Change the values of the properties as follows: 
   
   • -Dlst_t_core=200
   • -Dlst_t_max=250

   • -Dsnd_t_core=200
   • -Dsnd_t_max=250

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1. Using concurrent consumers
2. Enabling caching

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concurrentConsumers concurrentConsumers

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Using concurrent consumers

Concurrent consumers is the minimum number of threads for message consuming. If there are more messages to be consumed while the running threads are busy, then additional threads are started until the total number of threads reaches the value of he maximum number of concurrent consumers (ie., MaxConcurrentConsumers). The maximum number of concurrent consumers (or the number of JMS proxies) that can be deployed is limited by the base transport worker pool that is used by the JMS transport. The size of this worker pool can be configured via the system property 'lst_t_core' and 'lst_t_max' as described above. The number of concurrent producers are generally limited by the Synapse core worker pool.

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Add the following parameters to the JMS listener configuration of the <ESB_HOME>/repository/conf/axis2/axis2.xml file:

<parameter name="transport.jms.ConcurrentConsumers" locked="false">50</parameter> 
<parameter name="transport.jms.MaxConcurrentConsumers" locked="false">50</parameter>

Parameters 

• transport.jms.ConcurrentConsumers: the concurrent threads that need to be started to consume messages when polling.
• transport.jms.MaxConcurrentConsumers: the maximum number of concurrent threads to use during polling.

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Add the following parameter to the JMS listener configuration of the  <ESB_HOME>/repository/conf/axis2/axis2.xml file to enable caching:

<parameter name="transport.jms.CacheLevel">consumer</parameter>

The possible values for the cache level are none, auto, connection, session and consumer. Out of the possible values, consumer is the highest level that provides maximum performance. 

After adding concurrency consumers and cache level, your complete configuration would be as follows:

<transportReceiver name="jms" class="org.apache.axis2.transport.jms.JMSListener"> 
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<parameter name="myQueueConnectionFactory" locked="false"> 
<parameter name="java.naming.factory.initial" locked="false">org.apache.activemq.jndi.ActiveMQInitialContextFactory</parameter> 
<parameter name="java.naming.provider.url" locked="false">tcp://localhost:61616</parameter> 
<parameter name="transport.jms.ConnectionFactoryJNDIName" locked="false">QueueConnectionFactory</parameter> 
<parameter name="transport.jms.ConnectionFactoryType" locked="false">queue</parameter> 
<parameter name="transport.jms.ConcurrentConsumers" locked="false">50</parameter> 
<parameter name="transport.jms.MaxConcurrentConsumers" locked="false">50</parameter> 
<parameter name="transport.jms.CacheLevel">consumer</parameter> 
</parameter>
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</transportReceiver>

Configuring JMS Sender

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Enabling caching

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Add the following parameter to the JMS sender configuration of the  <ESB_HOME>/repository/conf/axis2/axis2.xml file:

Code Block
language xml
<parameter name="transport.jms.CacheLevel">producer</parameter>

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Note
When using producer as the cache level, ensure to add the JMS destination parameter to avoid the following error: INFO - AxisEngine [MessageContext: logID=2eabe85aeeb3bb62c26bb46d21b11b087ebf1e5e0b350839] JMSCC0029: A destination must be specified when sending from  this   producer.

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Remove ClientApiNonBlocking when sending messages via JMS

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To remove the ClientApiNonBlocking property

Add the following parameter to the configuration:

<property name="ClientApiNonBlocking" action="remove" scope="axis2"/>