'Unknown Result Type' - JDBC Driver

Hi,

I am using the JDBC interface. Does anybody know what
could lead to the following two errors I ran into -

1. Cannot handle multiple result groups.
at
org.postgresql.Connection.ExecSQL(Connection.java,
Compiled Code)
at

org.postgresql.jdbc2.Statement.execute(Statement.java,
Compiled Code)
at

org.postgresql.jdbc2.Statement.executeQuery(Statement.java,
Compiled Code)
at

org.postgresql.jdbc2.PreparedStatement.executeQuery(PreparedStatement.java,
Compiled Code)

This seems to have been followed by a whole lot of
occurences of -

2. Unknown Response Type ^@
at
org.postgresql.Connection.ExecSQL(Connection.java,
Compiled Code)
at java.lang.Exception.<init>(Exception.java,
Compiled Code)
at
java.sql.SQLException.<init>(SQLException.java,
Compiled Code)
at

org.postgresql.util.PSQLException.<init>(PSQLException.java,
Compiled Code)
at
org.postgresql.Connection.ExecSQL(Connection.java,
Compiled Code)
at

org.postgresql.jdbc2.Statement.execute(Statement.java,
Compiled Code)
at

org.postgresql.jdbc2.Statement.executeQuery(Statement.java,
Compiled Code)
at

org.postgresql.jdbc2.PreparedStatement.executeQuery(PreparedStatement.java,
Compiled Code)

I normally do not see this happen, and do not know
if I can replicate this error reliably. Any
information
regarding the meaning/cause of this error and whether
there is a way to get around it/avoid it, would be
really helpful.

Thanks,
Rini

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