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With JBoss 4.2 or 4.3 an EBJ 1.1 application should be deployable.
The first issue is to migrate the server specific deployment descriptors for your application.
Also configurations for datasources, JMS stuff and servlet engines.
If the application is standard conform it will be not a big problem, but I suppose you have the challange to migrate some 'optimizations' theat depend on the server implementation.
Thanks wolf-Dieter for quick reply
Can I run EJB1.1 with latest version of JBoss AS like 6.0 ?
As per EJB 3.0 standards
All EJB 3.0 implementations must support EJB 1.1, EJB 2.0, and EJB 2.1 deployment descriptors for
applications written to earlier versions of the Enterprise JavaBeans specification
I think yes, EJB2.1 will work.
AFAIK there is a plan to reduce the support of old EJB with JBoss7, but I have no idea how much ...