Итак, простой REST контроллер на Java с использованием Spring framework.

@org.springframework.web.bind.annotation.RestController
@RequestMapping("api")
public class RestController {
    @Autowired
    private MessageRepo messageRepo;
    @Autowired
    private JournalFind journalFind;

    @GetMapping(value = "{searchsn}", produces = "application/json;charset=UTF-8")
    public String list(@PathVariable String searchsn) {
        Streamable messages;
            messages = messageRepo.findBySnContainingIgnoreCase(searchsn)
                    .and(messageRepo.findByTextContainingIgnoreCase(searchsn))
                    .and(messageRepo.findByOwnerContainingIgnoreCase(searchsn))
                    .and(messageRepo.findByInvidContainingIgnoreCase(searchsn));

        JSONObject jObject = new JSONObject();
        try
        {
            JSONArray jArray = new JSONArray();
            for (Message mess : messages)
            {
                JSONObject result = new JSONObject();
                result.put("id", mess.getId());
                result.put("name", mess.getText());
                result.put("invid", mess.getInvid());
                result.put("sn", mess.getSn());
                result.put("owner", mess.getOwner());
                jArray.put(result);
            }
            jObject.put("result", jArray);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return jObject.toString();
    }


    @GetMapping(value = "/hist/{id}", produces = "application/json;charset=UTF-8")
    public String hist(@PathVariable Long id) {
        Iterable journal = journalFind.findByMessageid(id);
        JSONObject jObject = new JSONObject();
        try
        {
            JSONArray jArray = new JSONArray();
            for (Journal jour : journal)
            {
                JSONObject result = new JSONObject();
                result.put("author", jour.getAuthor());
                result.put("date", jour.getDate());
                result.put("owner", jour.getNewowner());
                jArray.put(result);
            }
            jObject.put("result", jArray);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return jObject.toString();
    }
}

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