How can I keep a kind of global object (Singleton) in App Server?

Question

Hi,
I am working with Application Server Platform Edition 8. I want to have a object on the App Server which will have only single instance. The instance will be available to all objects(ejbs) in the server.

Answer 1

duffimo is right, the above approch can not be implemented.
I think we can achieve this by doing following setting in descriptor.
For Stateless bean under Weblogic (weblogic-ejb-jar.xml)
<pool>
<max-beans-in-free-pool>1</max-beans-in-free-pool>
<initial-beans-in-free-pool>1</initial-beans-in-free-pool>
</pool>
For Stateful bean under Weblogic (weblogic-ejb-jar.xml)
<stateful-session-cache>
<max-beans-in-cache>1</max-beans-in-cache>
</stateful-session-cache>
For Entity bean under Weblogic (weblogic-ejb-jar.xml)
<pool>
<max-beans-in-free-pool>1</max-beans-in-free-pool>
<initial-beans-in-free-pool>1</initial-beans-in-free-pool>
</pool>
and instance cache size
<entity-cache>
<max-beans-in-cache>1</max-beans-in-cache>
</entity-cache>
Hope these work....