add project

demoexception/.gitignore

@@ -0,0 +1,31 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**
+!**/src/test/**
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+
+### VS Code ###
+.vscode/

demoexception/README.md

@@ -0,0 +1,11 @@
+# Spring Boot REST API Exception handling
+
+### Reference
+* Lombok
+* MongoDB
+
+### Hands-on coding
+Show how to create custom exception and error message.
+
+
+

demoexception/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>2.2.1.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>org.wj.prajumsook</groupId>
+	<artifactId>demoexception</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>demoexception</name>
+	<description>Demo project for Spring Boot</description>
+
+	<properties>
+		<java.version>1.8</java.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-mongodb</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>org.junit.vintage</groupId>
+					<artifactId>junit-vintage-engine</artifactId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

demoexception/src/main/java/org/wj/prajumsook/DemoexceptionApplication.java

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+package org.wj.prajumsook;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DemoexceptionApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(DemoexceptionApplication.class, args);
+	}
+
+}

demoexception/src/main/java/org/wj/prajumsook/cofig/InitTestData.java

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+package org.wj.prajumsook.cofig;
+
+import lombok.extern.log4j.Log4j2;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
+import org.springframework.context.ApplicationListener;
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Component;
+import org.wj.prajumsook.entity.Book;
+import org.wj.prajumsook.service.BookService;
+
+import java.util.UUID;
+
+@Log4j2
+@Component
+@Profile("local")
+public class InitTestData implements ApplicationListener<ApplicationReadyEvent> {
+
+    @Autowired
+    private BookService service;
+
+    @Override
+    public void onApplicationEvent(ApplicationReadyEvent event) {
+        service.deleteAll();
+        service.save(new Book(UUID.randomUUID().toString(), "Book Title", "Book author"));
+        log.info("One book saved");
+    }
+}

demoexception/src/main/java/org/wj/prajumsook/controller/BookController.java

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+package org.wj.prajumsook.controller;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+import org.wj.prajumsook.entity.Book;
+import org.wj.prajumsook.service.BookService;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/book")
+public class BookController {
+
+    @Autowired
+    private BookService bookService;
+
+    @GetMapping
+    public List<Book> getAll() {
+        return bookService.getAll();
+    }
+
+    @GetMapping("/{id}")
+    public Book getBook(@PathVariable(value = "id") String id) {
+        return bookService.getById(id);
+    }
+
+    @DeleteMapping("/{id}")
+    public Book deleteById(@PathVariable(value = "id")String id) {
+        return bookService.deleteById(id);
+    }
+}

demoexception/src/main/java/org/wj/prajumsook/entity/Book.java

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+package org.wj.prajumsook.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.springframework.data.mongodb.core.mapping.Document;
+
+@Document
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Book {
+
+    private String id;
+    private String title;
+    private String author;
+
+}

demoexception/src/main/java/org/wj/prajumsook/entity/BookRepository.java

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+package org.wj.prajumsook.entity;
+
+import org.springframework.data.mongodb.repository.MongoRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface BookRepository extends MongoRepository<Book, String> {
+}

demoexception/src/main/java/org/wj/prajumsook/exception/ApiException.java

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+package org.wj.prajumsook.exception;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@Builder
+@AllArgsConstructor
+@NoArgsConstructor
+public class ApiException {
+
+    private String code;
+    private String type;
+    private String message;
+
+}

demoexception/src/main/java/org/wj/prajumsook/exception/ApiExceptionHandler.java

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+package org.wj.prajumsook.exception;
+
+import lombok.extern.log4j.Log4j2;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
+
+@Log4j2
+@ControllerAdvice
+@RestControllerAdvice
+public class ApiExceptionHandler extends ResponseEntityExceptionHandler {
+
+    @ExceptionHandler(BookNotFoundException.class)
+    public ResponseEntity<CustomerApiException> handleApiException(BookNotFoundException ex) {
+        logException(ex);
+        ApiException exception = new ApiException();
+        exception.setCode("error-000404");
+        exception.setType(HttpStatus.NOT_FOUND.toString());
+        exception.setMessage("No book found with id: " + ex.getId());
+        CustomerApiException customerApiException = new CustomerApiException(exception);
+
+        return new ResponseEntity<>(customerApiException, HttpStatus.NOT_FOUND);
+    }
+
+    @ExceptionHandler(Exception.class)
+    public ResponseEntity<CustomerApiException> handleException(Exception ex) {
+        logException(ex);
+        ApiException apiException = new ApiException();
+        apiException.setCode("error-000500");
+        apiException.setType(HttpStatus.INTERNAL_SERVER_ERROR.toString());
+        apiException.setMessage(ex.getMessage());
+
+        return new ResponseEntity<>(new CustomerApiException(apiException), HttpStatus.INTERNAL_SERVER_ERROR);
+    }
+
+    private void logException(Throwable t) {
+        StringBuilder sb = new StringBuilder();
+        for(StackTraceElement element : t.getStackTrace()) {
+            sb.append(element.toString());
+            sb.append("\n");
+        }
+
+        log.error("ERROR: [\n" + sb.toString() + "]");
+    }
+}

demoexception/src/main/java/org/wj/prajumsook/exception/BookNotFoundException.java

@@ -0,0 +1,16 @@
+package org.wj.prajumsook.exception;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+@Builder
+public class BookNotFoundException extends RuntimeException {
+
+    private String id;
+
+}

demoexception/src/main/java/org/wj/prajumsook/exception/CustomerApiException.java

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+package org.wj.prajumsook.exception;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Data
+@Builder
+@AllArgsConstructor
+@NoArgsConstructor
+public class CustomerApiException {
+
+    private ApiException apiException;
+
+}

demoexception/src/main/java/org/wj/prajumsook/service/BookService.java

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+package org.wj.prajumsook.service;
+
+import lombok.AllArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.wj.prajumsook.entity.Book;
+import org.wj.prajumsook.entity.BookRepository;
+import org.wj.prajumsook.exception.BookNotFoundException;
+
+import java.util.List;
+
+@Service
+@AllArgsConstructor
+public class BookService {
+
+    private BookRepository repository;
+
+    public List<Book> getAll() {
+        return repository.findAll();
+    }
+
+    public Book getById(String id) {
+        return repository.findById(id).orElseThrow(() -> new BookNotFoundException(id));
+    }
+
+    public void deleteAll() {
+        repository.deleteAll();
+    }
+
+    public Book save(Book book) {
+        return repository.save(book);
+    }
+
+    public Book deleteById(String id) {
+        Integer.parseInt("xxx");
+        Book book = getById(id);
+        repository.deleteById(book.getId());
+
+        return book;
+    }
+}

demoexception/src/main/resources/application.properties

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+spring.profiles.active=local

demoexception/src/test/java/org/wj/prajumsook/DemoexceptionApplicationTests.java

@@ -0,0 +1,13 @@
+package org.wj.prajumsook;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class DemoexceptionApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}