I am using NetBeans 4.2 (9/7) build, and Appserver 8.1 PE UR2 for testing.

Steps to recreate:

(1) Create a project
(2) At EJB module node, click on Server Resources node -> New -> File ->
Sun Resources - > JDBC Resources
(3) Create JDBC resources select create new JDBC connection pool option,
it created and JDBC resources called  
(4) try to register the JDBC resources, it says successful, but when checked
the runtime tab, the JDBC resources was not there.  Acutally, in this case
I expect to see an error message saying the pool is not there, but I did not
see this kind error message.  This is issue (1)
(5) try to register the JDBC connection pool, every thing is fine
(6) try to register the JDBC resources again, it says successful, but when 
checked the runtime tab, the JDBC resources was not there.  This is issue (2)