I am using the Atomikos transaction manager to handle the 2PC over JMS and JDBC. The JMS implementation is Oracle AQ. Springs DI is used to wire everything up, based on this article: http://blog.nominet.org.uk/tech/2007/10/04/spring-jms-with-oracle-aq/
Everything works fine when the WAR is launched for the first time after the Tomcat app server is started. However, when I want to restart the application without shutting down and restarting Tomcat, I get the following error:
javax.naming.NamingException: Another resource already exists with name AtomikosDataSourceJMSOracle - pick a different name
Atomikos is installed in the Tomcat container and not on the WAR level. I.e. the Atomikos jars and jta.properties are located in the CATALINA_HOME/lib directory.
I believe the cause for this error to be linked to the fact that the resource AtomikosDataSourceJMSOracle is already present in the IntraVmObjectRegistry, which is handled at J2EE container level. When the WAR is restarted, the IntraVmObjectRegistry remains in memory, but Spring wants to recreate and rewire its beans, creating a second resource with the name AtomikosDataSourceJMSOracle.
Is there a way to bypass this gracefully? Could Spring be configured in such a way that it actually recuperates the existing resource instead of creating a new one?
OK, the problem has been solved. When the application shuts down it needs to call the close() method on the AtomikosConnectionFactoryBean.
This is easily accomplished by adding a destroy-method attribute to the Spring bean definition.
I can now restarted the web app without the need for restarting Tomcat.
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