How to display all beans loaded by Spring Boot

By mkyong | Updated: March 1, 2017

Viewed: 14,946 (+106 pv/w)

Tags: application context spring boot

In Spring Boot, you can use appContext.getBeanDefinitionNames() to get all the beans loaded by the Spring container.

1. CommandLineRunner as Interface

package com.mkyong;

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 java.util.Arrays;

@SpringBootApplication
public class Application implements CommandLineRunner {

    @Autowired
    private ApplicationContext appContext;

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

    @Override
    public void run(String... args) throws Exception {

        String[] beans = appContext.getBeanDefinitionNames();
        Arrays.sort(beans);
        for (String bean : beans) {
            System.out.println(bean);
        }

    }

}

Output

application
customerRepository
customerRepositoryImpl
dataSource
dataSourceInitializedPublisher
dataSourceInitializer
dataSourceInitializerPostProcessor
emBeanDefinitionRegistrarPostProcessor
entityManagerFactory
entityManagerFactoryBuilder
hikariPoolDataSourceMetadataProvider
jdbcTemplate
jpaContext
//...

2. CommandLineRunner as Bean

Just different ways to print the loaded beans.

package com.mkyong;

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 java.util.Arrays;

@SpringBootApplication
public class Application {

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

    @Bean
    public CommandLineRunner run(ApplicationContext appContext) {
        return args -> {

            String[] beans = appContext.getBeanDefinitionNames();
            Arrays.stream(beans).sorted().forEach(System.out::println);

        };
    }

}

References

1. CommandLineRunner JavaDoc
2. Spring Boot non-web application example