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Where should I put @Bean in Spring Boot?

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Tomeriko

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This article describes solution of problem, where to put @Bean function using Spring Boot. The preferred way of keeping beans is class annotated with @Configuration. Below source codes show simple bean location examples.

1. Bean location tempalte

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In this section default approach for creating beans is presented. It is recommended to look on next point that contains practical example.

ServerConfig class is annoted with @Configuration, beanName() function is annoted with @Bean, The best location for ServerConfig class is package that contains class with main() function, that runs all application - SpringApplication.run(....class, args) call.

Note: ServerConfig class name can be replaced with any other class name.

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package my.projest.package;
​
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
​
@Configuration
public class ServerConfig {
​
    @Bean
    public ConfigurationClass beanName() {
        ConfigurationClass configuration = new ConfigurationClass();
​
        // setting configuration...
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        return configuration;
    }
}

2. Web server factory bean example

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In this section web server factory bean location is presented. This configuration is used by Spring Boot 2 to change default port, but the bean can be changed with any configuration with @Bean annotation.

ServerConfig.java file:

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package com.dirask.examples;
​
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.boot.web.servlet.server.ConfigurableServletWebServerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
​
@Configuration
public class ServerConfig {
​
    @Bean
    public ConfigurableServletWebServerFactory webServerFactory() {
        TomcatServletWebServerFactory factory = new TomcatServletWebServerFactory();
​
        factory.addConnectorCustomizers(connector -> {
            connector.setPort(80);
        });
​
        return factory;
    }
}