How to list all Beans available in the ApplicationContext

In this tutorial you will learn how to list all Beans which are bound into the org.springframework.context.ApplicationContext.

The ApplicationContext is a core element of a Spring Boot application. It represents the Spring IoC container and is responsible for instantiating, configuring, and assembling the beans.

Let’s start from a minimal project, using the Spring Initializr or the CI:

spring init -dweb helloworld 

Now edit the class DemoApplication:

package com.example.helloworld;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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 DemoApplication implements CommandLineRunner {
  private static Logger logger = LoggerFactory.getLogger(DemoApplication.class);
  @Autowired private ApplicationContext applicationContext;

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

  @Override
  public void run(String... args) throws Exception {
    String[] beans = applicationContext.getBeanDefinitionNames();
    for (String bean : beans) {
      System.out.println(bean);
    }
  }
}

Test it

mvn install spring-boot:run 

Output:

org.springframework.context.annotation.internalConfigurationAnnotationProcessor org.springframework.context.annotation.internalAutowiredAnnotationProcessor org.springframework.context.annotation.internalCommonAnnotationProcessor org.springframework.context.event.internalEventListenerProcessor org.springframework.context.event.internalEventListenerFactory demoApplication org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory org.springframework.boot.autoconfigure.AutoConfigurationPackages org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration propertySourcesPlaceholderConfigurer org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration$TomcatWebSocketConfiguration websocketServletWebServerCustomizer org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryConfiguration$EmbeddedTomcat tomcatServletWebServerFactory org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration servletWebServerFactoryCustomizer tomcatServletWebServerFactoryCustomizer org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor org.springframework.boot.context.internalConfigurationPropertiesBinderFactory org.springframework.boot.context.internalConfigurationPropertiesBinder org.springframework.boot.context.properties.BoundConfigurationProperties org.springframework.boot.context.properties.ConfigurationPropertiesBeanDefinitionValidator org.springframework.boot.context.properties.ConfigurationBeanFactoryMetadata server-org.springframework.boot.autoconfigure.web.ServerProperties webServerFactoryCustomizerBeanPostProcessor errorPageRegistrarBeanPostProcessor org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration$DispatcherServletConfiguration dispatcherServlet spring.mvc-org.springframework.boot.autoconfigure.web.servlet.WebMvcProperties org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration$DispatcherServletRegistrationConfiguration dispatcherServletRegistration org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration taskExecutorBuilder applicationTaskExecutor spring.task.execution-org.springframework.boot.autoconfigure.task.TaskExecutionProperties org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration error beanNameViewResolver org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration$DefaultErrorViewResolverConfiguration conventionErrorViewResolver org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration errorAttributes basicErrorController errorPageCustomizer preserveErrorControllerTargetClassPostProcessor spring.resources-org.springframework.boot.autoconfigure.web.ResourceProperties org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$EnableWebMvcConfiguration requestMappingHandlerAdapter requestMappingHandlerMapping welcomePageHandlerMapping mvcConversionService mvcValidator mvcContentNegotiationManager mvcPathMatcher mvcUrlPathHelper viewControllerHandlerMapping beanNameHandlerMapping routerFunctionMapping resourceHandlerMapping mvcResourceUrlProvider defaultServletHandlerMapping handlerFunctionAdapter mvcUriComponentsContributor httpRequestHandlerAdapter simpleControllerHandlerAdapter handlerExceptionResolver mvcViewResolver mvcHandlerMappingIntrospector org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter defaultViewResolver viewResolver requestContextFilter org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration formContentFilter org.springframework.boot.autoconfigure.aop.AopAutoConfiguration$ClassProxyingConfiguration org.springframework.boot.autoconfigure.aop.AopAutoConfiguration org.springframework.boot.autoconfigure.availability.ApplicationAvailabilityAutoConfiguration applicationAvailability org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration org.springframework.boot.autoconfigure.context.LifecycleAutoConfiguration lifecycleProcessor spring.lifecycle-org.springframework.boot.autoconfigure.context.LifecycleProperties org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$Jackson2ObjectMapperBuilderCustomizerConfiguration standardJacksonObjectMapperBuilderCustomizer spring.jackson-org.springframework.boot.autoconfigure.jackson.JacksonProperties org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperBuilderConfiguration jacksonObjectMapperBuilder org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$ParameterNamesModuleConfiguration parameterNamesModule org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperConfiguration jacksonObjectMapper org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration jsonComponentModule org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration$StringHttpMessageConverterConfiguration stringHttpMessageConverter org.springframework.boot.autoconfigure.http.JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration mappingJackson2HttpMessageConverter org.springframework.boot.autoconfigure.http.JacksonHttpMessageConvertersConfiguration org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration messageConverters org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration spring.info-org.springframework.boot.autoconfigure.info.ProjectInfoProperties org.springframework.boot.autoconfigure.security.oauth2.resource.servlet.OAuth2ResourceServerAutoConfiguration spring.security.oauth2.resourceserver-org.springframework.boot.autoconfigure.security.oauth2.resource.OAuth2ResourceServerProperties org.springframework.boot.autoconfigure.task.TaskSchedulingAutoConfiguration taskSchedulerBuilder spring.task.scheduling-org.springframework.boot.autoconfigure.task.TaskSchedulingProperties org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration restTemplateBuilder org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration$TomcatWebServerFactoryCustomizerConfiguration tomcatWebServerFactoryCustomizer org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration org.springframework.boot.autoconfigure.web.servlet.HttpEncodingAutoConfiguration characterEncodingFilter localeCharsetMappingsCustomizer org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration multipartConfigElement multipartResolver spring.servlet.multipart-org.springframework.boot.autoconfigure.web.servlet.MultipartProperties org.springframework.aop.config.internalAutoProxyCreator