configuration - Configure Standalone Custom Registry in Clustered WebSphere Application Server -

i have problem configuring standalone custom registry in websphere application server (cluster environment). have followed steps ibm manual:

1. i have implemented userregistry interface in databaseregistry class
2. i have copied .jar lib/ext folder of websphere
3. i have assigned necessary properties on global security page

and while trying assign standalone custom registry current got following error:

validation failed: error occurred in requiredmodelmbean while trying invoke operation getusers 

the funny part followed of steps in standalone version of websphere (not clustered) , working (so problem not in code). thing there nothing in log files. can see getusers called , no exception or anything.

update: resolved problem. propably not 100% focused.

it tourned out forgot copy additional jar jdbc drivers lib/ext allow connect mssql.

lesson learned: not start important configuration work on friday after lunch ;)