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Gradle Manipulator @ Red Hat

Standardize Your Builds


GME (Gradle Manipulation Extension) is a set of Gradle plugins and a CLI that allow the alignment of versions of a Gradle project according to some external preference.

Two plugins make up the extension, the analyzer plugin and the manipulation plugin.

The job of the analyzer plugin is to generate a metadata file that contains altered dependencies for each project of a Gradle Project. The file is then meant to be used by the manipulation plugin to enforce the versions of the dependencies that are captured in the metadata file.

The metadata file is named manipulation.json and is created by the generateAlignmentMetadata task of the alignment plugin in the root directory of the target Gradle project.



NOTE : The CLI is only available from version 1.4.

The CLI is capable of running arbitrary groovy scripts prior to the build. See here for further details on this.

Usage: GradleAnalyser [-dhV] [-l=<installation>] -t=<target>
CLI to optionally run Groovy scripts and then invoke Gradle.
  --[no-]colour           Enable (or disable with '--no-colour') colour output
                            on logging.
  -d                      Enable debug.
  -D=<String=String>      Pass supplemental arguments (e.g. groovy script
  -h, --help              Show this help message and exit.
  -l=<installation>       Location of Gradle installation.
  -t, --target=<target>   Target Gradle directory.
  -V, --version           Print version information and exit.

Apart from the Groovy scripting, the CLI can modify colour output, enable debug logging, pass extra -D parameters, specify the Gradle distribution to use and specify the target directory to operate on.

Note that the CLI will capture unmatched arguments and pass them directly to the Gradle build. For example, below --stacktrace, --init-script and the task exclusion of -x task-to-exclude are all passed to Gradle.

java -jar cli.jar --target=<gradle-project> -d
    -x task-to-exclude

It is possible to run the Gradle process using a different JDK by passing in the following parameter:<JDK-Location>

To obtain the CLI it may be downloaded from Maven Central here.

Disabling the alignment

You can disable GME through the CLI using the manipulation.disable property:

$ gradle -Dmanipulation.disable=true...

Applying the Plugin(s)

There are multiple ways that the plugins can be applied.

It should also be noted that the project itself contains a properly configured init script for the analyzer plugin (which gets released along with the plugin). Furthermore, when the analyzer plugin executes, it alters the main gradle script of the target project to include the manipulation plugin.


General Configuration

Unresolved Dependencies

If the tool is not able to resolve certain dependencies then it may fail during the alignment phase. Set ignoreUnresolvableDependencies to true to ignore those (default: false).


The tool uses its own logging system (that backs onto the Gradle logging system).

Feature Guide

Below are links to more specific information about configuring sets of features in GME: