Try this one:

> conn.setTransactionIsolation(
> FBConnection.TRANSACTION_READ_COMMITTED);

conn.setTransactionIsolation(
java.sql.Connection.TRANSACTION_READ_COMMITTED);

> conn.setTransactionParameters(
> FBConnection.TRANSACTION_READ_COMMITTED,
> new int[] {
> FBConnection.TPB_READ_COMMITTED,
> FBConnection.TPB_REC_VERSION,
> FBConnection.TPB_NOWAIT});

conn.setTransactionParameters(
java.sql.Connection.TRANSACTION_READ_COMMITTED,
new int[] {
org.firebirdsql.jdbc.FirebirdConnection.TPB_READ_COMMITTED,
org.firebirdsql.jdbc.FirebirdConnection.TPB_REC_VERSION,
org.firebirdsql.jdbc.FirebirdConnection.TPB_NOWAIT});

Roman