Wednesday, September 13, 2006

JMS Q&A, again

J4: Looks like all my coding experience (++ Weblogic MQ, JbossMQ, ActiveMQ) doesn't give me the nlg to appear experienced in front of the interviewer. Many answers are found in EJB book.

Q: major jms-specific objects involved for sending a msg to a Topic?
Hints: TopicConnectionFactory, TopicSession...

Q: there's a simple but imp method for MDB and non-MDB alike?

Q: u know a jms program in a container need to query JNDI (for Session, Queue names ....) but how about a stand-alone java app?

Q: (vague question) how essential is onMessage()?
A: Not only MDB, but also needed by a stand-alone java app that subscribes to a jms queue/topic. P335 [[ ejb ]]
-> Q: what other methods in the stand-alone guy?
-> A: it need a way to bind to the queue/topic, often by JNDI

Q: which interface/abstract-class requires onMessage()?

A: topic conn factory <- jndi contains an entry for the factory
factory -> topic conn obj
topic conn -> session obj
topic <- jndi
session, topic -> topic publisher

A: needed too. see P334

A: onMessage()

A: MessageListener iface, which has only one method

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