Code: Bean Components

JJWriter.java

This class has not changed.

package com.javajee.spring;

public interface JJWriter {

    public void write();

}

JJDatabaseWriter.java

package com.javajee.spring;

import org.springframework.context.annotation.Profile;
import org.springframework.stereotype.Component;

@Component("writer")
@Profile({"default","dbprofile"})
public class JJDatabaseWriter implements JJWriter {

    public void write() {
        System.out.println("Writing to Database!!!");
    }
    
    @Override
    public String toString(){
        return "Writing to Database!!!";
    }
}

JJFileWriter.java

package com.javajee.spring;

import org.springframework.context.annotation.Profile;
import org.springframework.stereotype.Component;

@Component("writer")
@Profile("fileprofile")
public class JJFileWriter implements JJWriter {

    public void write() {
        System.out.println("Writing to File!!!");
    }
    
    @Override
    public String toString(){
        return "Writing to File!!!";
    }

}

Code: Defining Property

Create a properties file 'application.properties' in classpath with the property 'spring.profiles.active':

spring.profiles.active=dbprofile

Code: Java Config File

DemoConfig.java

package com.javajee.spring;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

@Configuration
@PropertySource("classpath:/application.properties")
@ComponentScan(basePackages="com.javajee.spring")
public class DemoConfig {

}

Code: Test Class

JJWriterMain.java

package com.javajee.spring;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;

public class JJWriterMain {

    public static void main(String[] args) {

        AbstractApplicationContext context = new AnnotationConfigApplicationContext(DemoConfig.class);

        JJWriter writer = context.getBean("writer", JJWriter.class);

        writer.write();
        
        context.close();
    }
}

Now change the profiles within properties file to test. If you use a profile that does not exist, you get a error that the bean could not be found. If you remove the profile property, then you can test the default profile.