Database.close not closing database?

Question

I've a singleton holding onto open (read-only) database handles, the environment and catalog DB handles. I'm using a StoredMap.get() to pull specific data items by their keys. Everything works fine, except in my JVM shutdown hook.
The shutdown hook iterates over each of my open database handles and calls db.close() on them. Same goes for catalog DB and the environment.
However, when the shutdown hook code gets to environment.close, it throws a DatabaseException saying - 1 database still open in environment.
I've tried explicitly deallocating the reference to the database handle before calling db.close(). That doesn't help.
Any ideas on what might cause a db.close to execute (no exceptions thrown), but the corresponding environment.close still thinks the database is not yet closed?
I'm wondering if there is a timing aspect here, since the db.close and env.close are called in very rapid succession inside the shutdown hook code.
Thanks

Answer 1

Hi,
Any ideas on what might cause a db.close to execute
(no exceptions thrown), but the corresponding
environment.close still thinks the database is not
yet closed?
I'm wondering if there is a timing aspect here, since
the db.close and env.close are called in very rapid
succession inside the shutdown hook code.Calling them in succession should not be a problem. Is it possible that you've opened a database more than once? You have to close each "handle' you've opened if you open a database multiple times.
Mark