Spring Boot Mvc

HELP.md

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+# Getting Started
+
+### Reference Documentation
+For further reference, please consider the following sections:
+
+* [Official Apache Maven documentation](https://maven.apache.org/guides/index.html)
+* [Spring Boot Maven Plugin Reference Guide](https://docs.spring.io/spring-boot/4.0.3-SNAPSHOT/maven-plugin)
+* [Create an OCI image](https://docs.spring.io/spring-boot/4.0.3-SNAPSHOT/maven-plugin/build-image.html)
+
+### Maven Parent overrides
+
+Due to Maven's design, elements are inherited from the parent POM to the project POM.
+While most of the inheritance is fine, it also inherits unwanted elements like `<license>` and `<developers>` from the parent.
+To prevent this, the project POM contains empty overrides for these elements.
+If you manually switch to a different parent and actually want the inheritance, you need to remove those overrides.
+

README.md

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 # SpringBootMvc
-SorokinP
+

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>3.5.9</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+
+	<groupId>com.example</groupId>
+	<artifactId>demo</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>demo</name>
+	<description>Spring Boot MVC demo</description>
+
+	<properties>
+		<java.version>21</java.version>
+	</properties>
+
+    <dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-devtools</artifactId>
+            <scope>compile</scope>
+        </dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>com.fasterxml.jackson.core</groupId>
+			<artifactId>jackson-databind</artifactId>
+			<version>2.20.1</version>
+			<scope>compile</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+	<repositories>
+		<repository>
+			<id>spring-snapshots</id>
+			<name>Spring Snapshots</name>
+			<url>https://repo.spring.io/snapshot</url>
+			<releases>
+				<enabled>false</enabled>
+			</releases>
+		</repository>
+	</repositories>
+	<pluginRepositories>
+		<pluginRepository>
+			<id>spring-snapshots</id>
+			<name>Spring Snapshots</name>
+			<url>https://repo.spring.io/snapshot</url>
+			<releases>
+				<enabled>false</enabled>
+			</releases>
+		</pluginRepository>
+	</pluginRepositories>
+
+</project>

src/main/java/com/example/demo/DemoApplication.java

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+package com.example.demo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DemoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(DemoApplication.class, args);
+	}
+
+}

src/main/java/com/example/demo/controller/PetController.java

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+package com.example.demo.controller;
+
+import com.example.demo.model.PetDto;
+import com.example.demo.model.UserDto;
+import com.example.demo.service.PetService;
+import com.example.demo.service.UserService;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+
+@RestController
+@Slf4j
+@RequiredArgsConstructor
+@RequestMapping("/pets")
+public class PetController {
+
+    private final PetService petService;
+
+    @GetMapping(path = "/{id}")
+    public ResponseEntity<PetDto> getPet(@PathVariable long id) {
+        return ResponseEntity.status(HttpStatus.OK).body(petService.getPet(id));
+    }
+
+    @PostMapping(path = "/add")
+    public ResponseEntity<PetDto> createPet(@Valid @RequestBody PetDto petDto) {
+        return ResponseEntity.status(HttpStatus.CREATED).body(petService.createPet(petDto));
+    }
+
+    @PutMapping(path = "/update")
+    public ResponseEntity<Long> updatePet(@Valid @RequestBody PetDto petDto) {
+        return ResponseEntity.status(HttpStatus.OK).body(petService.updatePet(petDto));
+    }
+
+    @DeleteMapping(path = "/delete/{id}")
+    public ResponseEntity<Long> deletePet(@PathVariable long id) {
+        return ResponseEntity.status(HttpStatus.NO_CONTENT).body(petService.deletePet(id));
+    }
+
+}

src/main/java/com/example/demo/controller/UserController.java

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+package com.example.demo.controller;
+
+import com.example.demo.model.UserDto;
+import com.example.demo.service.UserService;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+
+@RestController
+@Slf4j
+@RequiredArgsConstructor
+@RequestMapping("/users")
+public class UserController {
+
+    private final UserService userService;
+
+    @GetMapping(path = "/{id}")
+    public ResponseEntity<UserDto> getUser(@PathVariable long id) {
+        return ResponseEntity.status(HttpStatus.OK).body(userService.getUser(id));
+    }
+
+    @PostMapping(path = "/add")
+    public ResponseEntity<UserDto> createUser(@Valid @RequestBody UserDto userDto) {
+        return ResponseEntity.status(HttpStatus.CREATED).body(userService.createUser(userDto));
+    }
+
+    @PutMapping(path = "/update")
+    public ResponseEntity<UserDto> updateUser(@Valid @RequestBody UserDto userDto) {
+        return ResponseEntity.status(HttpStatus.OK).body(userService.updateUser(userDto));
+    }
+
+    @DeleteMapping(path = "/delete/{id}")
+    public ResponseEntity<Long> deleteUser(@PathVariable long id) {
+        return ResponseEntity.status(HttpStatus.NO_CONTENT).body(userService.deleteUser(id));
+    }
+
+}

src/main/java/com/example/demo/exception/BadRequestException.java

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+package com.example.demo.exception;
+
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+
+@Getter
+@ResponseStatus(HttpStatus.BAD_REQUEST)
+public class BadRequestException extends RuntimeException {
+
+    private final Long resourceId;
+    private final String operation;
+
+    public BadRequestException(Long resourceId, String message, String operation) {
+        super(message);
+        this.resourceId = resourceId;
+        this.operation = operation;
+    }
+
+}

src/main/java/com/example/demo/exception/ErrorMessageResponse.java

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+package com.example.demo.exception;
+
+import lombok.Getter;
+import java.time.Instant;
+
+
+@Getter
+public class ErrorMessageResponse {
+
+    private final String error;
+    private final Instant timestamp;
+    private final String operation;
+
+    public ErrorMessageResponse(String error, String operation) {
+        this.error = error;
+        this.timestamp = Instant.now();
+        this.operation = operation;
+    }
+
+}

src/main/java/com/example/demo/exception/GlobalExceptionHandler.java

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+package com.example.demo.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.converter.HttpMessageNotReadableException;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<ErrorMessageResponse> handleValidationException(MethodArgumentNotValidException ex) {
+        var error = new ErrorMessageResponse("Неверный аргумент: " + ex.getMessage(), "Controller input");
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(error);
+    }
+
+    @ExceptionHandler(ResourceNotFoundException.class)
+    public ResponseEntity<ErrorMessageResponse> handleResourceNotFoundException(ResourceNotFoundException ex) {
+        var error = new ErrorMessageResponse(ex.getMessage(), ex.getOperation());
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(error);
+    }
+
+    @ExceptionHandler(BadRequestException.class)
+    public ResponseEntity<ErrorMessageResponse> handleBadRequestException(BadRequestException ex) {
+        var error = new ErrorMessageResponse(ex.getMessage(), ex.getOperation());
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(error);
+    }
+
+    @ExceptionHandler(Exception.class)
+    public ResponseEntity<ErrorMessageResponse> handleException(Exception ex) {
+        var error = new ErrorMessageResponse(ex.getMessage(), "Generic");
+        if (ex instanceof HttpMessageNotReadableException) {
+            error = new ErrorMessageResponse(ex.getMessage(), "Controller input");
+        }
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(error);
+    }
+
+}

src/main/java/com/example/demo/exception/ResourceNotFoundException.java

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+package com.example.demo.exception;
+
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+
+@Getter
+@ResponseStatus(HttpStatus.NOT_FOUND)
+public class ResourceNotFoundException extends RuntimeException {
+
+    private final Long resourceId;
+    private final String operation;
+
+    public ResourceNotFoundException(Long resourceId, String message, String operation) {
+        super(message);
+        this.resourceId = resourceId;
+        this.operation = operation;
+    }
+
+}

src/main/java/com/example/demo/model/PetDto.java

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+package com.example.demo.model;
+
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Positive;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+
+
+@Getter
+@Setter
+@RequiredArgsConstructor
+@AllArgsConstructor
+public class PetDto {
+    @NotNull
+    private Long id;
+    @NotNull
+    private String name;
+    @Positive
+    private Long userId;
+}

src/main/java/com/example/demo/model/UserDto.java

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+package com.example.demo.model;
+
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Positive;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+
+import java.util.List;
+
+
+@Getter
+@Setter
+@RequiredArgsConstructor
+@AllArgsConstructor
+public class UserDto {
+    @NotNull
+    private Long id;
+    @NotNull
+    private String name;
+    @Email
+    private String email;
+    @Positive
+    private Integer age;
+    @NotNull
+    private List<PetDto> pets;
+}
+
+//public record UserDto(Long id, String name, String email, Integer age, List<PetDto> pets) {}