This post demonstrates how to set all the bean properties with values from the .properties file using Spring Boot. We are not going to set them one at a time. We want to set them all simultaneously using the following Spring annotations.

@EnableConfigurationProperties

1	@EnableConfigurationProperties

@ConfigurationProperties

1	@ConfigurationProperties

Use Spring Initializr

For off, we’ll use Spring Initializr to generate our initial codes. You may refer to Create a Spring Boot Application using IntelliJ. For this post, you may select no dependencies in step 3.

Update pom.xml

Modify your pom.xml to include the following dependency.

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <optional>true</optional>
</dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-configuration-processor</artifactId>

</dependency>

Update Main class with @EnableConfigurationProperties

You have to annotate your main class.

package com.turreta.config2pojo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.ApplicationContext;

@SpringBootApplication
@EnableConfigurationProperties
public class ComTurretaConfig2pojoApplication {

	public static void main(String[] args) {
		ApplicationContext context = SpringApplication.run(ComTurretaConfig2pojoApplication.class, args);
		FirstConfig config = (FirstConfig)context.getBean("firstConfig");
		System.out.print(config);
	}
}

package com.turreta.config2pojo;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.context.properties.EnableConfigurationProperties;

import org.springframework.context.ApplicationContext;

@SpringBootApplication

@EnableConfigurationProperties

public class ComTurretaConfig2pojoApplication {

public static void main(String[] args) {

ApplicationContext context = SpringApplication.run(ComTurretaConfig2pojoApplication.class, args);

FirstConfig config = (FirstConfig)context.getBean("firstConfig");

System.out.print(config);

}

Annotate bean with @Component and @ConfigurationProperties

Next, you have to annotate your bean.

package com.turreta.config2pojo;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix="firstconfig")
public class FirstConfig {

    private String appName;
    private String appVersion;

    public String getAppName() {
        return appName;
    }

    public void setAppName(String appName) {
        this.appName = appName;
    }

    public String getAppVersion() {
        return appVersion;
    }

    public void setAppVersion(String appVersion) {
        this.appVersion = appVersion;
    }

    @Override
    public String toString() {
        return "FirstConfig{" +
                "appName='" + appName + '\'' +
                ", appVersion='" + appVersion + '\'' +
                '}';
    }
}

package com.turreta.config2pojo;

import org.springframework.boot.context.properties.ConfigurationProperties;

import org.springframework.stereotype.Component;

@Component

@ConfigurationProperties(prefix="firstconfig")

public class FirstConfig {

private String appName;

private String appVersion;

public String getAppName() {

return appName;

}

public void setAppName(String appName) {

this.appName = appName;

}

public String getAppVersion() {

return appVersion;

}

public void setAppVersion(String appVersion) {

this.appVersion = appVersion;

}

@Override

public String toString() {

return "FirstConfig{" +

"appName='" + appName + '\'' +

", appVersion='" + appVersion + '\'' +

'}';

}

The prefix attribute will enable Spring to pick up properties that start with that prefix value.

application.properties

The .properties contains the following properties.

firstconfig.appName=Config2Pojo
firstconfig.app-version=1.0.2

1 2	firstconfig.appName=Config2Pojo firstconfig.app-version=1.0.2

Note that for property names with hyphens or dash (“-“), Spring will convert the following character to uppercase.

firstconfig.app-version is interpreted as firstconfig.appVersion.

Sample Output

Download the Codes

You may download the codes from https://github.com/Turreta/config2pojo