sample code to create SWIFT MT 205COV using the Datamation SMV (more examples at http://wiki.datamation.gr/x/OIBH)

SampleMessageCreation.java

@Test
public void testCreating205COV() {
    SwiftMessage message = new SwiftMessage();

    // Set Tags for block1
    message.setArgApplid("F");
    message.setArgServid("01");
    message.setArgLTaddrBlk1("AAAABEBBAXXX");

    // Set Tags for block2
    message.setArgInoutind("I");
    message.setArgMsgtype("205");
    message.setArgLTaddrBlk2("CCCCUS33AXXX");
    message.setArgMsgprior("N");

    addTagsToBlock(message.getBlock3(), ":119:COV");//this tag tells SWIFT that this is a COV message

    addTagsToBlock(message.getBlock4(),
            ":20:987COV",
            ":21:090525/123COV",
            ":32A:090527USD10500,00",
            ":52A:AAAABEBB",
            ":58A:BBBBGB22",
            ":50F:/123564982101\n1/MR. BIG\n2/HIGH STREET 3\n3/BE/BRUSSELS",
            ":59:/987654321\nMR. SMALL\nLOW STREET 15\nLONDON GB",
            ":70:/INV/1234",
            ":33B:USD10500,00");

    // Set Tags for block5 (This block is optional)
    addTagsToBlock(message.getBlock5(), ":MAC:75D138E4", ":CHK:DE1B0D71FA96"); //add MAC and CHK to block5 vector

    // Now validate and build the outgoing message in a string format as SWIFT expects it.
    SwiftValidObj validation = new SwiftMsgValidator().validateMsg(message);

    if (validation.hasErrors()){  //If validation error
        ValidationErrorList errorList = validation.getValidationErrorList();
        for(ValidationError error : errorList) { //Print error messages
            System.out.println(error);
        }

    } else {
        String swiftMessage = validation.getMessage();
        System.out.println(swiftMessage); //Print the constructed Swift message.
    }
}

private static void addTagsToBlock(List block, String... tags) {
    for(String tag : tags) {
        String tagKey = tag.replaceAll("(?s):(.*):.*", "$1");
        String tagValueString = tag.replaceAll("(?s):.*:(.*)", "$1");
        String[] lines = tagValueString.split("\n");

        Vector tagValue = new Vector();
        for(String line : lines) {
            tagValue.add(line);
        }
        block.add(new Tag(tagKey, tagValue));
    }
}