Spring Boot – Exception Handling | Code Factory


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pom.xml

<?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>com.codeFactory</groupId>
	<artifactId>spring-boot-exception-handling</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>spring-boot-exception-handling</name>
	<description>Demo project for Spring Boot Exception Handling</description>

	<properties>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</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>

SpringBootExceptionHandlingApplication.java

package com.codeFactory;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author code.factory
 *
 */
@SpringBootApplication
public class SpringBootExceptionHandlingApplication {

	public static void main(String[] args) {
		SpringApplication.run(SpringBootExceptionHandlingApplication.class, args);
	}

}

Employee.java

package com.codeFactory.bean;

import java.util.HashMap;
import java.util.Map;

/**
 * @author code.factory
 *
 */
public class Employee {

	private int id;
	private String name;
	private static Map<Integer, Employee> employeeList = new HashMap<Integer, Employee>();

	public Employee(int id, String name) {
		this.id = id;
		this.name = name;
	}

	public static Map<Integer, Employee> getEmployeesList() {
		employeeList.put(1, new Employee(1, "Emp1"));
		employeeList.put(2, new Employee(2, "Emp2"));
		employeeList.put(3, new Employee(3, "Emp3"));
		return employeeList;
	}

	public int getId() {
		return id;
	}

	public String getName() {
		return name;
	}

}

EmployeeController.java

package com.codeFactory.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import com.codeFactory.bean.Employee;
import com.codeFactory.exception.EmployeeNotFound;



/**
 * @author code.factory
 *
 */
@RestController
public class EmployeeController {

	@GetMapping("getEmployee/{id}")
	public Employee getEmployee(@PathVariable("id") int id) {
		if(Employee.getEmployeesList().containsKey(id)) {
			return Employee.getEmployeesList().get(id);
		}
		throw new EmployeeNotFound("Employee Not Found");
	}
}

EmployeeExceptionController.java

package com.codeFactory.exception;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;

/**
 * @author code.factory
 *
 */
@ControllerAdvice
public class EmployeeExceptionController {

	@ExceptionHandler(value = EmployeeNotFound.class)
	public ResponseEntity<Object> exception(EmployeeNotFound e) {
		return new ResponseEntity<>(e.getMessage(), HttpStatus.NOT_FOUND);
	}
}

EmployeeNotFound.java

package com.codeFactory.exception;

/**
 * @author code.factory
 *
 */
public class EmployeeNotFound extends RuntimeException {

	public EmployeeNotFound(String message) {
		super(message);
	}
}

Hit URL : http://localhost:8080/getEmployee/1

Hit URL : http://localhost:8080/getEmployee/4

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