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Spring Boot – Display All Beans Available in ApplicationContext

In this article, I am going to show you how to see the beans that are loaded by the Spring Boot from the ApplicationContext.  What we have to do is implement main class with CommandLineRunner/ApplicationRunner interface and override its run method.

CommandLineRunner/ApplicationRunner’s run() method will get execute right after ApplicationContext is created and before Spring Boot application initialized. This run() method will execute only once in an application’s life cycle.  So what’s the difference between CommandLineRunner/ApplicationRunner? Basically, both will do the same trick, the only difference is CommandLineRunner’s run() method will accept String array and ApplicationRunner’s run() will accept ApplicationArguments as arguments.

SpringBootApp.java

package com.java4s.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;

@SpringBootApplication
public class SpringBootApp implements CommandLineRunner {

    @Autowired
    private ApplicationContext context;

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

    @Override
    public void run(String...args) throws Exception {
        String[] beans = context.getBeanDefinitionNames();

        for (String bean: beans) {
            System.out.println(bean);
        }
    }
}

Output

Run the application and you will be able to see all the beans available in the context, here I am just adding few bean names from my console 😉

...
org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration
org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$DefaultErrorViewResolverConfiguration
requestMappingHandlerAdapter
requestMappingHandlerMapping
mvcValidator
mvcContentNegotiationManager
mvcPathMatcher
mvcUrlPathHelper
viewControllerHandlerMapping
beanNameHandlerMapping
resourceHandlerMapping
mvcResourceUrlProvider
defaultServletHandlerMapping
mvcConversionService
mvcUriComponentsContributor
httpRequestHandlerAdapter
simpleControllerHandlerAdapter
handlerExceptionResolver
mvcViewResolver
...
....

Give a try by downloading and executing this application in your local 🙂

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  ::. About the Author .::

Java4s_Author
- Java/J2EE Full Stack Developer
Founder of Java4s - Get It Yourself, A popular Java/J2EE Programming Blog, Love Java and UI frameworks.
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Comments

One Response to “Spring Boot – Display All Beans Available in ApplicationContext”
  1. vinod says:

    Hi, Could you please provide tutorials in micro services and dockers.

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