"liujw2001" wrote : Hello: | There is a question puzles me for a long time: | | Now that the ConnectionManager should be implemented by application server in Managed Environment, Why the Resource Adapter in some examples implements it again? | The implement of this ConnectionManager usually is very simple, only includes an allocateManagedConnection function. | Where did you see this happening ? CM should be implemented by the Appserver in case of the ManagedEnvironment and by the ResourceAdapter for non Managed Environment . Go and read the JCA specs , most of your questions will be answered after that . View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4096449#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...