This guide outlines the process of compiling the Spring Framework version 6.x from its source code, ensuring compatibility with modern development environments.

Prerequisites

• Operating System: Windows 10
• IDE: IntelliJ IDEA 2023.1.2 (Ultimate Edition)
• JDK: Version 17 or higher (Spring 6 requires JDK 17+)

Configuring Global Repository Access

To expedite dependency resolution during the build process, similar to Maven's settings.xml, we can define a global Gradle configuration file. Create a file named init.gradle in you're Gradle configuration directory (typically %USERPROFILE%/.gradle/ on Windows) with the following content:

allprojects {
    repositories {
        mavenLocal()
        maven { url "https://maven.aliyun.com/repository/public" }
        maven { url 'https://maven.aliyun.com/repository/central' }
        maven { url 'https://maven.aliyun.com/repository/google' }
        maven { url 'https://maven.aliyun.com/repository/spring' }
        maven { url 'https://maven.aliyun.com/repository/grails-core' }
        maven { url 'https://maven.aliyun.com/repository/apache-snapshots' }
        jcenter()
        mavenCentral()
    }
    buildscript {
        repositories {
            mavenLocal()
            maven { url 'https://maven.aliyun.com/repository/public' }
            maven { url 'https://maven.aliyun.com/repository/central' }
            maven { url 'https://maven.aliyun.com/repository/gradle-plugin' }
            maven { url 'https://maven.aliyun.com/repository/spring-plugin' }
            jcenter()
            mavenCentral()
        }
    }
}

Importing and Configuring the Project

1. Import the Spring Framework source code into IntelliJ IDEA.
2. Configure the Gradle settings to use the correct JDK version (JDK 17+). Navigate to File > Settings > Build, Execution, Deployment > Build Tools > Gradle and set the Gradle JVM to your installed JDK 17 or higher.

Building the Project

With the repository configurasion in place, Gradle will automatically fetch dependencies from the specified mirrors, primarily from Aliyun's repository. Once the dependencies are downloaded, you can proceed with building the project.

Execute the following Gradle tasks to build the framework:

./gradlew build

Testing the Compilation

To verify the successful compilation and runtime behavior of the core Spring components, you can create a simpple test application within the source tree.

Create a new package, for example, org.springframework.test.study, within the spring-test module.

TestServiceImpl.java

package org.springframework.test.study;

import org.springframework.stereotype.Component;

@Component
public class TestServiceImpl {
    public void displayMessage() {
        System.out.println("Spring compilation successful!");
    }
}

TestSpring.java

package org.springframework.test.study;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ComponentScan;

@ComponentScan("org.springframework.test.study")
public class TestSpring {
    public static void main(String[] args) {
        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(TestSpring.class);
        TestServiceImpl service = applicationContext.getBean(TestServiceImpl.class);
        service.displayMessage();
    }
}

Run the TestSpring.main() method. The expected output confirms that the Spring context can be initialized and components can be discovered and used:

Spring compilation successful!