How to force IntelliJ to download javadocs with Maven?

1. Open the project and POM file: First, ensure your project is based on Maven and is open in IntelliJ. Locate the pom.xml file.

2. Configure Maven plugins: In pom.xml, configure the maven-dependency-plugin to automatically download Javadoc. This is achieved by adding a plugin configuration to the build section. Here is an example configuration:

xml
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <version>3.1.2</version>
            <executions>
                <execution>
                    <goals>
                        <goal>resolve</goal>
                        <goal>resolve-plugins</goal>
                    </goals>
                    <configuration>
                        <classifier>javadoc</classifier>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

This configuration ensures that Javadoc for your dependencies and plugins will be downloaded.

1. Run Maven commands: In IntelliJ, open the Maven tool window and right-click the 'Reload' button at the top of the project. This action reloads the Maven project and downloads the necessary Javadoc based on the pom.xml configuration.

2. Check Javadoc: After download, view Javadoc on any class or method by pressing Ctrl+Q (or Ctrl+J on Mac). If configured correctly and the download is successful, you should see the relevant documentation.

3. If unsuccessful, check network and configuration: If Javadoc is not downloaded, it may be due to network issues or incorrect Maven repository settings. Verify your network connection stability and confirm that the correct Maven repository address is configured in IntelliJ settings.

Using this method, you can ensure Javadoc is always available during Java development in IntelliJ, which is highly beneficial for understanding how to use libraries and their APIs.