>> Could you please show me the code example or give the link to
>> manual/javadoc?
>
> TransactionParameterBuffer tpb1 =
> connection1.createTransactionParameterBuffer();
>
> tpb1.addArgument(TransactionParameterBuffer.READ_COMMITTED);
> tpb1.addArgument(TransactionParameterBuffer.REC_VERSION);
> tpb1.addArgument(TransactionParameterBuffer.READ);
> tpb1.addArgument(TransactionParameterBuffer.WAIT);
>
> connection1.setTransactionParameters(tpb1);

Ah, forgotten to say that connection1 is of type
org.firebirdsql.jdbc.FirebirdConnection and TransactionParameterBuffer
can be found in a org.firebirdsql.gds package.

Roman