I want to get full message body. So I try:
Message gmailMessage = service.users().messages().get(\"me\", messageId).setFormat(\"full\").execute();
Base on the @Tholle comment I've made something like that
Message message = service.users().messages() .get(user, messageHolder.getId()).execute(); System.out.println(StringUtils.newStringUtf8(Base64.decodeBase64( message.getPayload().getParts().get(0).getBody().getData())));