[Recipe] Spring Profiles Introduction

Problem: 

Create a basic Spring program that uses Profiles. 

Solution Summary: 

@Profile annotation allow you to register components that will be selected only if its associated profile is active. You can selectively activate a set of beans in a class or all beans .

Solution: 

Code: Bean components

JJWriter.java

package com.javajee.spring;

public interface JJWriter {

    public void write();

}

 

JJFileWriter.java

package com.javajee.spring;

public class JJFileWriter implements JJWriter {

    public void write() {
        System.out.println("Writing to file!!!");
    }

}

 

JJDatabaseWriter.java

package com.javajee.spring;

public class JJDatabaseWriter implements JJWriter {

    public void write() {
        System.out.println("Writing to Database!!!");
    }
}

 

Code: Java config file

DemoConfig.java

package com.javajee.spring;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;

@Configuration
public class DemoConfig {

    @Bean (name = "writer")  
    @Profile({"default","dbprofile"})
    public JJWriter getJJDatabaseWriter()
    {
        return new JJDatabaseWriter();
    }
    
    @Bean (name = "writer")
    @Profile("fileprofile")
    public JJWriter getJJFileWriter()
    {
        return new JJFileWriter();
    }
}

 

Code: Test Class

JJWriterMain.java

package com.javajee.spring;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class JJWriterMain {

    public static void main(String[] args) {

        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
        context.getEnvironment().setActiveProfiles("fileprofile");
        //Set profile and register config class
        context.register(DemoConfig.class);
        context.refresh();

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

        writer.write();
    }
}

Check out different ways to activate profiles here.

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