// Fetch all values:
final String name = jtf_name.getText();
final ContentType ct = jp_contentType.getContentType();
final String body = jta_part.getText();
ReqEntityStringPart part = new ReqEntityStringPartBean(
name, ct, body);
// Call all listeners:
for(AddMultipartPartListener l: listeners) {
l.addPart(part);