Invalid transaction state - held cursor requires same isolation level

[Geoff hendrey]

Here are 3 lines from my code:

Connection c = ConnectionManager.getConnection(req);
c.setAutoCommit(false);
c.setTransactionIsolation(Connection.TRANSACTION_READ_UNCOMMITTED); 


The *second* time this block executes, I get this exception from the attempt to 
setTransactionIsolation:

java.sql.SQLException: Invalid transaction state - held cursor requires same 
isolation level
        at 
org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(Unknown Source)
        at org.apache.derby.client.am.SqlException.getSQLException(Unknown 
Source)
        at org.apache.derby.client.am.Statement.executeUpdate(Unknown Source)
        at 
org.apache.derby.client.am.Connection.setTransactionIsolation(Unknown Source)
 

ANyone have any ideas what this message might mean? My guess is that a result 
set is open and a cursor in that result set is somehow not getting closed after 
the first pass. But I'm hard pressed to see where in my code this could be 
happening since I close all my connections in finally blocks.