2 issues on the page http://www.quickfixj.org/quickfixj/usermanual/usage/sending_messages.html in the section "Most Type Safe... DO THIS!", the following code is shown:

{{{
quickfix.fix41.OrderCancelRequest message(
new OrigClOrdID("123"),
new ClOrdID("321"),
new Symbol("LNUX"),
new Side(Side.BUY));
}}}

This does not compile because the variable is not created correctly; it should be

{{{
quickfix.fix41.OrderCancelRequest message = new quickfix.fix41.OrderCancelRequest (
new OrigClOrdID("123"),
new ClOrdID("321"),
new Symbol("LNUX"),
new Side(Side.BUY));
}}}

Note the additional code "= new quickfix.fix41.OrderCancelRequest"

Second issue:

The line "Session.sendToTarget(message, "TW", "TARGET");" throws "SessionNotFound" which needs to be surrounded in a try..catch block