Initial Commit (#6202)

spring-boot/src/main/java/com/baeldung/validation/application/Application.java

@@ -0,0 +1,27 @@
+package com.baeldung.validation.application;
+
+import com.baeldung.validation.application.entities.User;
+import com.baeldung.validation.application.repositories.UserRepository;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+
+@SpringBootApplication
+public class Application {
+    
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+    
+    @Bean
+    public CommandLineRunner run(UserRepository userRepository) throws Exception {
+        return (String[] args) -> {
+            User user1 = new User("Bob", "bob@domain.com");
+            User user2 = new User("Jenny", "jenny@domain.com");
+            userRepository.save(user1);
+            userRepository.save(user2);
+            userRepository.findAll().forEach(System.out::println);
+        };
+    }
+}

spring-boot/src/main/java/com/baeldung/validation/application/controllers/UserController.java

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+package com.baeldung.validation.application.controllers;
+
+import com.baeldung.validation.application.entities.User;
+import com.baeldung.validation.application.repositories.UserRepository;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import javax.validation.Valid;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.FieldError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class UserController {
+
+    private final UserRepository userRepository;
+
+    @Autowired
+    public UserController(UserRepository userRepository) {
+        this.userRepository = userRepository;
+    }
+
+    @GetMapping("/users")
+    public List<User> getUsers() {
+        return (List<User>) userRepository.findAll();
+    }
+
+    @PostMapping("/users")
+    ResponseEntity<String> addUser(@Valid @RequestBody User user) {
+        return ResponseEntity.ok("User is valid");
+    }
+    
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public Map<String, String> handleValidationExceptions(MethodArgumentNotValidException ex) {
+        Map<String, String> errors = new HashMap<>();
+        ex.getBindingResult().getAllErrors().forEach((error) -> {
+            String fieldName = ((FieldError) error).getField();
+            String errorMessage = error.getDefaultMessage();
+            errors.put(fieldName, errorMessage);
+        });
+        return errors;
+    }
+}

spring-boot/src/main/java/com/baeldung/validation/application/entities/User.java

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+package com.baeldung.validation.application.entities;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.Table;
+import javax.validation.constraints.NotBlank;
+
+@Entity
+public class User {
+    
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private long id;
+    
+    @NotBlank(message = "Name is mandatory")
+    private String name;
+    
+    @NotBlank(message = "Email is mandatory")
+    private String email;
+    
+    public User(){}
+    
+    public User(String name, String email) {
+        this.name = name;
+        this.email = email;
+    }
+    
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" + "id=" + id + ", name=" + name + ", email=" + email + '}';
+    }    
+}

spring-boot/src/main/java/com/baeldung/validation/application/repositories/UserRepository.java

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+package com.baeldung.validation.application.repositories;
+
+import com.baeldung.validation.application.entities.User;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface UserRepository extends CrudRepository<User, Long> {}