Spring Boot — Exception Handling | Code Factory

2 min readApr 28, 2020

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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