Spring boot: Get reference of ApplicationContext

You can get a reference to ApplicationContext by autowiring Application context in any of spring managed beans.

Example

@SpringBootApplication
public class App {

 @Autowired
 private ApplicationContext appContext;

 ....
 ....
}

Find the below working example.

Employee.java

package com.sample.app.model;

public class Employee {

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

 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() {
  Employee emp = new Employee();
  emp.setId(1);
  emp.setFirstName("Krishna");
  emp.setLastName("Majety");
  return emp;
 }

 @Bean("ram")
 public Employee newEmployee2() {
  Employee emp = new Employee();
  emp.setId(2);
  emp.setFirstName("Ram");
  emp.setLastName("Gurram");
  return emp;
 }
}

App.java

package com.sample.app;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;

import com.sample.app.model.Employee;

@SpringBootApplication
public class App {

 @Autowired
 private ApplicationContext appContext;

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

 @Bean
 public CommandLineRunner demo() {
  return (args) -> {

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

   Employee emp2 = appContext.getBean("ram", Employee.class);

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

  };
 }

}

pom.xml

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <groupId>com.sample.app</groupId>
 <artifactId>injectAppContext</artifactId>
 <version>1</version>

 <parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.1.6.RELEASE</version>
 </parent>


 <properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 </properties>

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

 </dependencies>
</project>

Total project structure looks like below.

Run App.java, you will get below messages in console.

Employee [id=1, firstName=Krishna, lastName=Majety]

Employee [id=2, firstName=Ram, lastName=Gurram]

You can download complete working application from this link.

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