In Spring Boot, you can use appContext.getBeanDefinitionNames() to get all the beans loaded by the Spring container.
1. CommandLineRunner as Interface
Application.java
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
Console.java
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.
Application.java
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);
};
}
}
Hi, I’m new to spring and Spring boot. I’ve been looking to find the explanation on how the commandLineRunner bean is getting called. Could you please point me to any useful resource? Thanks in advance.
My understanding is that as long as there’s a commandLineRunner in the spring context, it’ll get executed. But I don’t know if that’s correct. I’m also interested to know the running or initialisation order of the things in spring.
thanks for the help
How to display only user beans (beans that are defined by developer in the code)?
Hi Ali,
You can use Actuator with HAL BROWSER to see all the beans(beans that are defined by developer in the code) and all other AutoConfigure beans also.
Thanks Irfan,
Yes Actuator list all the beans. But I get very last list of beans which is mix-up of both user-defined and auto-configured beans. I want to display a list of only user defined beans.