How to Add a Local .jar File Dependency to build.gradle?

How do I add a local .jar file dependency to my Gradle project?

apply plugin: 'java'

sourceSets {
    main {
        java {
            srcDir 'src/model'
        }
    }
}

dependencies {
    runtime files('libs/mnist-tools.jar', 'libs/gson-2.2.4.jar')
    runtime fileTree(dir: 'libs', include: '*.jar')
}

To successfully add local .jar file dependencies in Gradle, ensure the .jar files are correctly referenced in your `build.gradle` file, and that your project structure allows for proper dependency resolution.

dependencies {
    implementation fileTree(dir: 'libs', include: '*.jar')
}

Causes

• The .jar files may not be located in the specified directory.
• The project structure may not match the expected layout for Gradle to find the resources correctly.
• Conflicting Gradle configurations or syntax errors in the `build.gradle` file.

Solutions

• Verify that the .jar files exist in the specified 'libs' directory of your project.
• Ensure that your project structure aligns with Gradle conventions, particularly regarding source sets and library locations.
• Adjust the Gradle build command to ensure it's referencing the correct project path.

Mistake: Incorrect path to the .jar file.

Solution: Double-check that the path to your .jar files correctly matches their actual location in your project structure.

Mistake: Using an outdated or unsupported Gradle configuration.

Solution: Update your `build.gradle` file to use `implementation` instead of `runtime`, which is the recommended approach in newer Gradle versions.