Difference between “group” and “component” in QuickFIX/J

Question

I am new to the FIX world. I am writing an application processing FIX messages in Java and for that I am using QuickFIX/J. I have downloaded the DataDictionary from the home

Answer 1

Just going to add some information since the accepted answer is missing this information (probably due to the fact that it is about five years old now).

In QuickFIX/J you are actually able to get and set components. So you can for example simply copy the Instrument component from one message to another.

    @Test
    public void testComponent() throws Exception {
        final Instrument instrument = new Instrument();
        instrument.set(new Symbol("DELL"));
        instrument.set(new CountryOfIssue("USA"));
        instrument.set(new SecurityType(SecurityType.COMMON_STOCK));

        final quickfix.fix44.NewOrderSingle newOrderSingle = new quickfix.fix44.NewOrderSingle();
        newOrderSingle.set(instrument);

        final quickfix.fix44.ExecutionReport executionReport = new quickfix.fix44.ExecutionReport();
        executionReport.setComponent(newOrderSingle.getInstrument());

        System.out.println("NOS: " + newOrderSingle.toString().replace('\001', '|'));
        System.out.println("ER:  " + executionReport.toString().replace('\001', '|'));
    }

Output:

NOS: 8=FIX.4.4|9=28|35=D|55=DELL|167=CS|470=USA|10=233|
ER:  8=FIX.4.4|9=28|35=8|55=DELL|167=CS|470=USA|10=221|

Maybe this is also possible in the other QuickFIX language variants.