On Mon, 8 Nov 2010, Michael Fork wrote:
> Caused by: org.postgresql.util.PSQLException: The column name mdn was not found
> in this ResultSet.
>
> I receive the above error message when accessing the JDBC resultset from
> multiple threads. It does not occur consistently, but roughly every 20
> or 30 runs and almost immediately upon invocation. Looking at
> org/postgresql/jdbc2/AbstractJdbc2ResultSet.java it appears there is a
> race condition around building columnNameIndexMap
>
> I cannot confirm this, but I would guess that on thread enters, has the
> NULL map and creates the new HashMap. The second thread enters, sees
> the non-NULL columnNameIndexMap, and gets to the HashMap.get call prior
> to the first thread fully populating the map. If this is the problem,
> would wrapping the IF block in a synchronized(this) block fix it?
>
That looks like the correct diagnosis and fix to me.
Kris Jurka
