The JMS message store persists messages in a JMS queue inside a JMS Broker. The JMS message store can be configured by specifying the class as
org.apache.synapse.message.store.impl.jms.JmsStore. Since the JMS message stores persist messages in a JMS queue in an ordered manner, JMS message stores can be used to implement the store-and-forward pattern.
When you add a JMS message store, it is required to specify values for the following:
- Name - A unique name for the JMS message store.
- Initial Context Factory (
java.naming.factory.initial) - The JNDI initial context factory class. This class must implement the
java.naming.spi.InitialContextFactoryinterface. Initial Context Factory used to connect to the JMS broker.
- Provider URL (
java.naming.provider.url) - The URL of the JNDI provider. Url of the naming provider to be used by the context factory.
Additional JMS message store parameters
|JNDI Queue Name (||The message store queue name.||Though this is not a required parameter, we recommend specifying a value for this.|
|Connection factory (||The JNDI name of the connection factory that is used to create jms connections||Though this is not a required parameter, we recommend specifying a value for this.|
|User Name (||The user name to connect to the broker.|
|Password (||The password to connect to the broker.||No|
|JMS API Specification Version (||The JMS API version to be used. Possible values are 1.1 or 1.0.||No. The default value is 1.1.|
|vender.class.loader.enabled||Set to false when using IBM MQ, which requires skipping the external class loader.||No, except when using IBM MQ|
|store.jms.cache.connection||true/false Enable Connection caching||No|
If you need to ensure guaranteed delivery when you store incoming messages to a JMS message store, and later deliver them to a particular backend, click Show Guaranteed Delivery Parameters and specify values for the following parameters:
- Enable Producer Guaranteed Delivery (
store.producer.guaranteed.delivery.enable) - Whether it is required to enable guaranteed delivery on the producer side.
- Failover Message Store (
store.failover.message.store.name) - The message store to which the store mediator should send messages when the original message store fails.
Example JMS message store configurations
Following is a sample JMS message store configuration that uses the Message Broker profile of WSO2 EI as the message broker:
When you use the Message Broker profile as the message broker and configure a Message Processor with
max.delivery.attempts, if the Message Broker profile does not get an acknowledgment from the Integration profile, it re-sends the message that results in duplicate messages being delivered. To avoid this, add the following line in the
Following is a sample JMS message store configuration that uses ActiveMQ as the message broker:
When you configure a JMS message store with the Message Broker profile or ActiveMQ, you need to copy the required client libraries to the
<EI_HOME>/lib directory. If the relevant client libraries are not copied, you will see a
For information on the client libraries you need to copy when configuring a JMS message store with the Message Broker profile, see Configure with the Message Broker profile.
For information on the client libraries you need to copy when configuring a JMS message store with ActiveMQ, see Configure with ActiveMQ.
Individual message priorities can be set using the following property on the provider. For example, the value can be 0-9 for ActiveMQ.
<property name="JMS_PRIORITY" value="9" scope="axis2"/>
If you are using ActiveMQ 5.12.2 and above, you need to set the following system property on server start up for WSO2 EI's JMS message store to work as expected.
With ActiveMQ 5.12.2 and above, you need to set the above property because users are enforced to explicitly whitelist packages that can be exchanged using ObjectMessages, and due to this restriction the message processor fails to read messages from ActiveMQ with the following error:
For information on configuring the JMS message store with different message brokers, see Store and Forward Using JMS Message Stores.