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public class UserController {
    private static final int HTTP_BAD_REQUEST = 400;
    private static final int HTTP_STATUS_OK = 200;
    private static final UserDAO dao = new UserDAO();
 
    public UserController() {
        get("/users", (request, response) -> {
            response.status(HTTP_STATUS_OK);
            response.type("application/json");
            return dataToJson(dao.findAll());
        });
 
        post("/users", (request, response) -> {
            try {
                ObjectMapper mapper = new ObjectMapper();
                User user = mapper.readValue(request.body(), User.class);
                if (!user.isValid()) {
                    response.status(HTTP_BAD_REQUEST);
                    return "";
                }
                if (dao.create(user)) {
                    response.status(HTTP_STATUS_OK);
                    response.type("application/text");
                    return user.getId();
                }
                else { return ""; }
            }
            catch (JsonParseException e) {
                response.status(HTTP_BAD_REQUEST);
                return "";
            }
        });
    }
 
    public static String dataToJson(Object data) {
        try {
            ObjectMapper mapper = new ObjectMapper();
            mapper.enable(SerializationFeature.INDENT_OUTPUT);
            StringWriter sw = new StringWriter();
            mapper.writeValue(sw, data);
            return sw.toString();
        } catch (IOException e) {
            throw new RuntimeException("IOException from a StringWriter?");
        }
    }
}

Main.java:1: error: class UserController is public, should be declared in a file named UserController.java
public class UserController {
       ^
Main.java:4: error: cannot find symbol
    private static final UserDAO dao = new UserDAO();
                         ^
  symbol:   class UserDAO
  location: class UserController
Main.java:4: error: cannot find symbol
    private static final UserDAO dao = new UserDAO();
                                           ^
  symbol:   class UserDAO
  location: class UserController
Main.java:7: error: cannot find symbol
        get("/users", (request, response) -> {
        ^
  symbol:   method get(String,(request,r[...])); })
  location: class UserController
Main.java:13: error: cannot find symbol
        post("/users", (request, response) -> {
        ^
  symbol:   method post(String,(request,r[...]; } })
  location: class UserController
Main.java:15: error: cannot find symbol
                ObjectMapper mapper = new ObjectMapper();
                ^
  symbol:   class ObjectMapper
  location: class UserController
Main.java:15: error: cannot find symbol
                ObjectMapper mapper = new ObjectMapper();
                                          ^
  symbol:   class ObjectMapper
  location: class UserController
Main.java:16: error: cannot find symbol
                User user = mapper.readValue(request.body(), User.class);
                ^
  symbol:   class User
  location: class UserController
Main.java:16: error: cannot find symbol
                User user = mapper.readValue(request.body(), User.class);
                                                             ^
  symbol:   class User
  location: class UserController
Main.java:28: error: cannot find symbol
            catch (JsonParseException e) {
                   ^
  symbol:   class JsonParseException
  location: class UserController
Main.java:37: error: cannot find symbol
            ObjectMapper mapper = new ObjectMapper();
            ^
  symbol:   class ObjectMapper
  location: class UserController
Main.java:37: error: cannot find symbol
            ObjectMapper mapper = new ObjectMapper();
                                      ^
  symbol:   class ObjectMapper
  location: class UserController
Main.java:38: error: cannot find symbol
            mapper.enable(SerializationFeature.INDENT_OUTPUT);
                          ^
  symbol:   variable SerializationFeature
  location: class UserController
Main.java:39: error: cannot find symbol
            StringWriter sw = new StringWriter();
            ^
  symbol:   class StringWriter
  location: class UserController
Main.java:39: error: cannot find symbol
            StringWriter sw = new StringWriter();
                                  ^
  symbol:   class StringWriter
  location: class UserController
Main.java:42: error: cannot find symbol
        } catch (IOException e) {
                 ^
  symbol:   class IOException
  location: class UserController
16 errors

Standard output is empty