How to initialize ConnectionFactory for remote JMS queue when remote machine is not running?
Using JBoss 4.0.5, JBossMQ, and Spring 2.0.8, I am trying to configure Spring to instantiate beans which depend on a remote JMS Queue resource. All of the examples I've come across depend on using JNDI to do lookup for things like the remote ConnectionFactory object.
My problem is when trying to bring up a machine which would put messages into the remote queue, if the remote machine is not up, JNDI lookup simply fails, causing deployment to fail. Is there a way to get Spring to keep trying to lookup this object in the background while not blocking the remainder of deployment?
Answer
Iit's difficult to be sure without seeing your spring config, but assuming you're using Spring's JndiObjectFactoryBean to do the JNDI lookup, then you can set the lookupOnStartup property to false, which allows the context to start up even if the JNDI target isn't there. The JNDI resolution will be done the first time the ConnectionFactory is used.
However, this just shifts the problem further up the chain, because if some other component tries to get a JMS Connection on startup, then you're back where you started. You can use the lazy-init="true" attribute on your other beans to prevent this from happening on deployment, but it's easy to accidentally put something in your config which forces everything to initialize.