EJB New User Create Race Condition

If I have an EJB that creates a new user account that does the following in the method:
if username already exists then
send error message to user
else
proceed with new user creation
end if
How do I prevent the following race condition:
User1 EJB: user name does not exist
User2 EJB: user name does not exist
User1 EJB: create new user
User2 EJB: create new user
Thanks,
Kurzweil4

unfortunately, you don't. however, assuming you have a unique constraint in the database, you can do this, but it's tricky because you might not get the failure until the transaction is committed. i personally would handle this by having the "main" (remote) method call untransacted. make this method call a second local ejb with a transaction context of create-new. do the actual work within this second method call. when this second method returns, either the call succeeded, or you will get some sort of ejb transaction rollback exception. you can then handle this exception in the outer method call.

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