Print all Beans in Spring Boot at startup

During Spring Boot application startup, many beans are created, some by Spring Boot framework while some that are configured for application. In case you need to print all the beans created for dubugging purpose, you can use ConfigurableApplicationContext getBeanDefinitionNames() method.

Below example shows how to get and print all Beans in a Spring Boot Application at startup.

Step 1) Create pom.xml and add below maven dependency

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

package com.example.demo;

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

@SpringBootApplication
public class PrintBeansApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext ctx = SpringApplication.run(PrintBeansApplication.class, args);
			
        System.out.println("Number of beans --> " + ctx.getBeanDefinitionCount());
        String[] beanNames = ctx.getBeanDefinitionNames(); // get beans
        for (String beanName : beanNames) {
            System.out.println("Bean --> "+ beanName); // print bean
        }
    }

} 	

Step 3) Running PrintBeansApplication

When you run PrintBeansApplication, you will see the list of beans printed in the console as shown below.

Output :

Number of beans --> 27
Bean --> org.springframework.context.annotation.internalConfigurationAnnotationProcessor
Bean --> org.springframework.context.annotation.internalAutowiredAnnotationProcessor
Bean --> org.springframework.context.annotation.internalCommonAnnotationProcessor
Bean --> org.springframework.context.event.internalEventListenerProcessor
Bean --> org.springframework.context.event.internalEventListenerFactory
Bean --> printBeansApplication
Bean --> org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory
Bean --> org.springframework.boot.autoconfigure.AutoConfigurationPackages
Bean --> org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration
Bean --> org.springframework.boot.autoconfigure.condition.BeanTypeRegistry
Bean --> propertySourcesPlaceholderConfigurer
Bean --> org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration
Bean --> mbeanExporter
Bean --> objectNamingStrategy
Bean --> mbeanServer
Bean --> org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration
Bean --> org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor
Bean --> org.springframework.boot.context.properties.ConfigurationBeanFactoryMetadata
Bean --> org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration
Bean --> spring.info-org.springframework.boot.autoconfigure.info.ProjectInfoProperties
Bean --> org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration
Bean --> taskExecutorBuilder
Bean --> applicationTaskExecutor
Bean --> spring.task.execution-org.springframework.boot.autoconfigure.task.TaskExecutionProperties
Bean --> org.springframework.boot.autoconfigure.task.TaskSchedulingAutoConfiguration
Bean --> taskSchedulerBuilder
Bean --> spring.task.scheduling-org.springframework.boot.autoconfigure.task.TaskSchedulingProperties