Simple App

src/main/java/dev/struchkov/example/controlleradvice/controller/PersonController.java

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+package dev.struchkov.example.controlleradvice.controller;
+
+import dev.struchkov.example.controlleradvice.domain.Person;
+import dev.struchkov.example.controlleradvice.service.PersonService;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.UUID;
+
+@Slf4j
+@RestController
+@RequestMapping("api/person")
+@RequiredArgsConstructor
+public class PersonController {
+
+    private final PersonService personService;
+
+    @GetMapping
+    public ResponseEntity<Person> getByLogin(@RequestParam("login") String login) {
+        return ResponseEntity.ok(personService.getByLoginOrThrown(login));
+    }
+
+    @GetMapping("{id}")
+    public ResponseEntity<Person> getById(@PathVariable("id") UUID id) {
+        return ResponseEntity.ok(personService.getByIdOrThrown(id));
+    }
+
+}

src/main/java/dev/struchkov/example/controlleradvice/domain/ErrorMessage.java

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+package dev.struchkov.example.controlleradvice.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@AllArgsConstructor
+public class ErrorMessage {
+
+    private String message;
+
+}

src/main/java/dev/struchkov/example/controlleradvice/domain/Person.java

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+package dev.struchkov.example.controlleradvice.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+import java.util.UUID;
+
+@Getter
+@Setter
+@AllArgsConstructor
+@NoArgsConstructor
+public class Person {
+
+    private UUID id;
+    private String login;
+    private String firstName;
+    private String password;
+
+}

src/main/java/dev/struchkov/example/controlleradvice/exception/AppException.java

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+package dev.struchkov.example.controlleradvice.exception;
+
+public class AppException extends RuntimeException {
+
+    public AppException(String message) {
+        super(message);
+    }
+
+}

src/main/java/dev/struchkov/example/controlleradvice/exception/NotFoundException.java

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+package dev.struchkov.example.controlleradvice.exception;
+
+public class NotFoundException extends AppException {
+
+    public NotFoundException(String message) {
+        super(message);
+    }
+
+}

src/main/java/dev/struchkov/example/controlleradvice/service/PersonService.java

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+package dev.struchkov.example.controlleradvice.service;
+
+import dev.struchkov.example.controlleradvice.domain.Person;
+import dev.struchkov.example.controlleradvice.exception.NotFoundException;
+import lombok.NonNull;
+import org.springframework.stereotype.Service;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+@Service
+public class PersonService {
+
+    private final Map<UUID, Person> persons = new HashMap<>();
+
+    public PersonService() {
+        final UUID komarId = UUID.randomUUID();
+        persons.put(komarId, new Person(komarId, "komar", "Алексей", "ertyuiop"));
+    }
+
+    public Person getByLoginOrThrown(@NonNull String login) {
+        return persons.values().stream()
+                .filter(person -> person.getLogin().equals(login))
+                .findFirst()
+                .orElseThrow();
+    }
+
+    public Person getByIdOrThrown(@NonNull UUID id) {
+        if (!persons.containsKey(id)) {
+            throw new NotFoundException("Пользователь не найден");
+        }
+        return persons.get(id);
+    }
+
+}