What does HHH000387 Hibernate warning mean?

Question

I have just updated to Hibernate 4.0 and am seeing the warning message :

HHH000387: ResultSet's statement was not registered

in my log files. What does this mean, and should I be worried?

Answer 1

I would not worry too much. In any case it looks like it is not in API's users hands to avoid this message. Logging is done in the org.hibernate.engine.jdbc.internal.JdbcResourceRegistryImpl. According documentation:

The main function of a JdbcResourceRegistry is to make sure resources get cleaned up.

Short look to the code tells, that such a message is logged in two situations:

1. ResultSet is registered via register-method, and statement is not registered.
2. ResultSet is released via release-method and statement is not registered.

Answer 2

Looking at the source for the JdbcResourceRegistryImpl class that throws this error, I personally think having it log at WARN level is excessive; it should be INFO at most, unless there's a way to have all Statements implicitly registered as part of a Hibernate/framework configuration.

It's not clear to me why a Statement should be registered, but if it's only a concern of the inner workings of Hibernate then routinely warning API users about it is a bug, right?