Lære Using Profiles for Environment-Specific Configuration | Advanced Java Configuration Techniques

Profiles are a powerful mechanism for handling environment-specific configuration in Java applications. By using profiles, you can separate properties and settings for different stages of your application lifecycle, such as development, testing, and production. This approach helps you avoid accidental misconfiguration and ensures that each environment uses the correct resources, credentials, and settings.

To select and load the appropriate profile at runtime, you typically use a system property or environment variable to indicate which profile should be active. Your application then reads this value and loads the corresponding properties file or configuration set. This allows you to switch between configurations without modifying your codebase, making deployment and testing safer and more flexible.

Main.java

config-dev.properties

config-prod.properties


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package com.example;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;

public class Main {
    public static void main(String[] args) {
        String profile = System.getProperty("profile", "dev");
        String filename = "config-" + profile + ".properties";
        Properties properties = new Properties();

        try (FileInputStream fis = new FileInputStream(filename)) {
            properties.load(fis);
            System.out.println("Loaded profile: " + profile);
            System.out.println("App Name: " + properties.getProperty("app.name"));
            System.out.println("DB URL: " + properties.getProperty("db.url"));
        } catch (IOException e) {
            System.out.println("Could not load properties for profile '" + profile + "': " + e.getMessage());
        }
    }
}

When you manage multiple profiles, it is important to organize your configuration files to minimize duplication and reduce maintenance effort. Place shared settings in a base properties file and override only the necessary values in environment-specific files. Use clear naming conventions, such as config-dev.properties, config-test.properties, and config-prod.properties, to avoid confusion. Always keep sensitive data, like production credentials, secure and out of source control.

Switching profiles should not require code changes. Instead, rely on external parameters like system properties or environment variables to indicate the active profile. This approach makes your application more portable and safer for deployment across different environments.

Main.java

application-test.properties

application-prod.properties


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package com.example;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;

public class Main {
    public static void main(String[] args) {
        String profile = System.getProperty("profile", "test");
        String filename = "application-" + profile + ".properties";
        Properties props = new Properties();

        try (FileInputStream fis = new FileInputStream(filename)) {
            props.load(fis);
            System.out.println("Active Profile: " + profile);
            System.out.println("Feature Flag: " + props.getProperty("feature.enabled"));
        } catch (IOException e) {
            System.out.println("Error loading profile '" + profile + "': " + e.getMessage());
        }
    }
}

1. What is a common way to specify which profile should be active in a Java application?

2. Why are profiles useful in Java configuration management?

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Main.java

config-dev.properties

config-prod.properties


              1234567891011121314151617181920212223
            
package com.example;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;

public class Main {
    public static void main(String[] args) {
        String profile = System.getProperty("profile", "dev");
        String filename = "config-" + profile + ".properties";
        Properties properties = new Properties();

        try (FileInputStream fis = new FileInputStream(filename)) {
            properties.load(fis);
            System.out.println("Loaded profile: " + profile);
            System.out.println("App Name: " + properties.getProperty("app.name"));
            System.out.println("DB URL: " + properties.getProperty("db.url"));
        } catch (IOException e) {
            System.out.println("Could not load properties for profile '" + profile + "': " + e.getMessage());
        }
    }
}

Main.java

application-test.properties

application-prod.properties


              12345678910111213141516171819202122
            
package com.example;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;

public class Main {
    public static void main(String[] args) {
        String profile = System.getProperty("profile", "test");
        String filename = "application-" + profile + ".properties";
        Properties props = new Properties();

        try (FileInputStream fis = new FileInputStream(filename)) {
            props.load(fis);
            System.out.println("Active Profile: " + profile);
            System.out.println("Feature Flag: " + props.getProperty("feature.enabled"));
        } catch (IOException e) {
            System.out.println("Error loading profile '" + profile + "': " + e.getMessage());
        }
    }
}

1. What is a common way to specify which profile should be active in a Java application?

2. Why are profiles useful in Java configuration management?

Alt var klart?

Takk for tilbakemeldingene dine!

Seksjon 3. Kapittel 2