App server-specific startup class needed?

["Bates, Alex" <AB...@teradata-ncr.com>]

What are the reasons for writing startup classes (ODMGFactory and PBFactory)
specific to an app server (extending jboss.ServiceMBeanSupport for JBoss,
and extending T3StartupDef for WebLogic, and xxx for WebSphere)?

Could this be achieved using JMX alone, or does the spec not meet the needs
to initialize the OJB factory classes and bind them to JNDI?  The reason for
asking is we are trying to support multiple app servers, and avoid coding to
specific vendors/versions where possible.

Thanks,

Alex