SMV multi-error sample (more examples at http://wiki.datamation.gr/x/OIBH)

ValidateMTTest.java

SwiftMessage message = new SwiftMsgProcessor().ParseMsgStringToObject(messageContent);
SwiftMsgValidator validator = new SwiftMsgValidator(DEFAULT_CRLF);
SwiftValidObj validation = validator.validateMsg(message);
for(ValidationError error : validation.getValidationErrorList()) {
    System.out.println(error.getTagName() + " => " + error.getDescription());
}