Spring boot: Give a name to bean via @Bean annotation

@Bean("nameOfBean") statement defines a bean with given name.

Example

@Bean("krishna")
public Employee newEmployee1() {
 System.out.println("New bean is getting initialized");
 Employee emp = new Employee();
 emp.setId(1);
 emp.setFirstName("Krishna");
 emp.setLastName("Majety");
 return emp;
}

You can access the bean using bean name via below statement.

Employee emp1 = applicationContext.getBean("krishna", Employee.class);

If you want to inject the bean via @Autowired annotation, you can use Qualifier annotation to specify the bean name.

Example

@Autowired

@Qualifier("krishna")

Employee employee;

Find the below working application.

Employee.java

package com.sample.app.model;

public class Employee {

 private int id;
 private String firstName;
 private String lastName;

 public Employee() {
  System.out.println("Constructor Called");
 }

 public int getId() {
  return id;
 }

 public void setId(int id) {
  this.id = id;
 }

 public String getFirstName() {
  return firstName;
 }

 public void setFirstName(String firstName) {
  this.firstName = firstName;
 }

 public String getLastName() {
  return lastName;
 }

 public void setLastName(String lastName) {
  this.lastName = lastName;
 }

 public void print() {
  StringBuilder builder = new StringBuilder();
  builder.append("Employee [id=").append(id).append(", firstName=").append(firstName).append(", lastName=")
    .append(lastName).append("]");
  System.out.println(builder.toString());

 }

}

EmployeeConfiguration.java

package com.sample.app.configuration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.sample.app.model.Employee;

@Configuration
public class EmployeeConfiguration {

 @Bean("krishna")
 public Employee newEmployee1() {
  System.out.println("New bean is getting initialized");
  Employee emp = new Employee();
  emp.setId(1);
  emp.setFirstName("Krishna");
  emp.setLastName("Majety");
  return emp;
 }
 
 @Bean("ram")
 public Employee newEmployee2() {
  System.out.println("New bean is getting initialized");
  Employee emp = new Employee();
  emp.setId(1);
  emp.setFirstName("Ram");
  emp.setLastName("Gurram");
  return emp;
 }
}

application.properties

logging.level.root=WARN

App.java

package com.sample.app;

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

import com.sample.app.model.Employee;

@SpringBootApplication
public class App {
 public static void main(String args[]) {
  System.out.println("Main Application running.......");
  ApplicationContext applicationContext = SpringApplication.run(App.class, args);

  System.out.println("ApplicationContext initialized");

  Employee emp1 = applicationContext.getBean("krishna", Employee.class);
  Employee emp2 = applicationContext.getBean("ram", Employee.class);

  emp1.print();
  emp2.print();
 }
}

Total project structure looks like below.

Run App.java.

You can see below messages in console.

Main Application running.......

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.6.RELEASE)

New bean is getting initialized
Constructor Called
New bean is getting initialized
Constructor Called
ApplicationContext initialized
Employee [id=1, firstName=Krishna, lastName=Majety]
Employee [id=1, firstName=Ram, lastName=Gurram]

You can download complete working application from this link.

Previous                                                    Next                                                    Home