Runaway Locks

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I was connecting to Postgres 8.3 through JDBC. During my unit tests, something when wrong and now leaving with the following locks in the db:

arc_dev=# select locktype, mode, relname, virtualtransaction, pid from pg_locks l join pg_class c on l.relation = c.oid;                                            
locktype |       mode       |          relname           | virtualtransaction | pid  
----------+------------------+----------------------------+--------------------+------ 
relation | AccessShareLock  | pg_locks                   | 1/38               | 1816 
relation | RowShareLock     | hibernate_sequences        | -1/2091555         |      
relation | RowExclusiveLock | hibernate_sequences        | -1/2091555         |      
relation | AccessShareLock  | pg_class_oid_index         | 1/38               | 1816 
relation | AccessShareLock  | pg_class_relname_nsp_index | 1/38               | 1816 
relation | AccessShareLock  | pg_class                   | 1/38               | 1816
(6 rows)arc_dev=# 

The locks on 'hibernate_sequences' is causing any update to the locked row to hang. There is currently no running database client process anymore (as I've restarted by server a few times).

My question is how do i kill the virtual transaction and have the locks released?

Thanks,
kam
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