# Wrapper Basics

version 9.2.0

The recommended way to execute any Gradle build is with the Gradle Wrapper.

The wrapper script invokes a declared version of Gradle, downloading it beforehand if necessary.

It is available as a `gradlew` or `gradlew.bat` file in the project root directory:

    root
    ├── gradlew     // THE WRAPPER FOR Linux / macOS
    ├── gradlew.bat // THE WRAPPER FOR Windows
    └── ...

If your project does not include these files, it is likely not a Gradle project—or the wrapper has not been set up yet.

| The wrapper is not something you download from the internet. You must generate it by running `gradle wrapper` from a machine with Gradle installed.

The wrapper provides the following benefits:

1. Automatically downloads and uses a specific Gradle version.

2. Standardizes a project on a given Gradle version.

3. Provisions the same Gradle version for different users and environments (IDEs, CI servers…​).

4. Makes it easy to run Gradle builds without installing Gradle manually.

## Using the Gradle Wrapper

It’s important to distinguish between two ways of running Gradle:

1. Using a system-installed Gradle distribution — by running the `gradle` command.

2. Using the Gradle Wrapper — by running the `gradlew` or `gradlew.bat` script included in a Gradle project.

The Gradle Wrapper is always the recommended way to execute a build to ensure a reliable, controlled, and standardized execution of the build.

1. Using a system-installed Gradle distribution:

       $ gradle build

2. Using the Gradle Wrapper:

   - Wrapper invocation on a Linux or OSX machine:

         $ ./gradlew build

   - Wrapper invocation on Windows PowerShell:

         $ gradlew.bat build

If you want to run the command in a different directory, you must provide the relative path to the wrapper:

    $ ../gradlew build

The following console output demonstrates the use of the wrapper on a Windows machine, in the command prompt (cmd), for a Java-based project:

    $ gradlew.bat build

    Downloading https://services.gradle.org/distributions/gradle-5.0-all.zip
    .....................................................................................
    Unzipping C:\Documents and Settings\Claudia\.gradle\wrapper\dists\gradle-5.0-all\ac27o8rbd0ic8ih41or9l32mv\gradle-5.0-all.zip to C:\Documents and Settings\Claudia\.gradle\wrapper\dists\gradle-5.0-al\ac27o8rbd0ic8ih41or9l32mv
    Set executable permissions for: C:\Documents and Settings\Claudia\.gradle\wrapper\dists\gradle-5.0-all\ac27o8rbd0ic8ih41or9l32mv\gradle-5.0\bin\gradle

    BUILD SUCCESSFUL in 12s
    1 actionable task: 1 executed

## Understanding the Wrapper files

The following files are part of the Gradle Wrapper:

    .
    ├── gradle
    │   └── wrapper
    │       ├── gradle-wrapper.jar  (1)
    │       └── gradle-wrapper.properties   (2)
    ├── gradlew (3)
    └── gradlew.bat (4)

1 | `gradle-wrapper.jar`: This is a small JAR file that contains the Gradle Wrapper code. It is responsible for downloading and installing the correct version of Gradle for a project if it’s not already installed.
2 | `gradle-wrapper.properties`: This file contains configuration properties for the Gradle Wrapper, such as the distribution URL (where to download Gradle from) and the distribution type (ZIP or TARBALL).
3 | `gradlew`: This is a shell script (Unix-based systems) that acts as a wrapper around `gradle-wrapper.jar`. It is used to execute Gradle tasks on Unix-based systems without needing to manually install Gradle.
4 | `gradlew.bat`: This is a batch script (Windows) that serves the same purpose as `gradlew` but is used on Windows systems.

| You should never alter these files.

If you want to view or update the Gradle version of your project, use the command line:

    $ ./gradlew --version
    $ ./gradlew wrapper --gradle-version 7.2

    $ gradlew.bat --version
    $ gradlew.bat wrapper --gradle-version 7.2

| Do not edit the wrapper files manually.

Next Step: Learn about the Gradle CLI >>