Gradle writing custom plugin

Creating custom gradle plugin for Android Studio

The canonical reference for building a production grade API with Spring. Gradle is a very popular build tool, which is often appreciated for the highly-customizable build process. Gradle writing custom plugin we're going to gradle writing custom plugin how to create custom Gradle plugins, that will allow us to modify the build process beyond what we can achieve with the standard configuration.

We can place our code in a few different locations. All of them have some advantages and disadvantages. We can simply put the source code of our plugin inside the build script itself. This will give us automatic compilation and inclusion of the plugin. It's very simple, however, our plugin won't be visible outside of the gradle writing custom plugin script.

Because of that, we can't reuse it in other build scripts. When you run Gradle, it'll check for the existence of the buildSrc folder. If that exists, Gradle will automatically build and include our plugin. This will give us the possibility to share our plugin between various build scripts, but we still won't be able to use it in other projects. Gradle writing custom plugin, we can create our plugin as a separate project which makes the plugin fully reusable in various projects.

However, to use start doing your homework before i come in an external project, we'll need to gradle writing custom plugin it in a jar file and add to a project.

Let's start with the basics — every Gradle Plugin must implement the com. Plugin interface. The interface is generic, so we can parametrize it with various parameter types. Usually, the parameter type is org.

However, we can use different type parameters so that the plugin is applied in different lifetime phases:. Now, when we call gradle hello, we'll see the default message defined gradle writing custom plugin our GreetingPluginExtension.

But since we have created the extension, we can use a closure to do that inside the build script:. Note that doing the same in Maven requires gradle-tooling-api dependency — from the Gradle repository:. The resource file needs to have a name that matches gradle writing custom plugin plugin id. So if our plugin has an id of org. There are some rules and conventions that plugin ID must follow in Gradle.

Most of them are similar to package name rules in Java:. Finally, there's a convention that plugin Id should be a lower case gradle writing custom plugin that follows reverse domain name convention. The main difference between Java package names and Gradle plugin names is that the package name is usually more detailed than the plugin ID.

When we want to publish our plugin to be able to reuse it in external projects, we have two ways of achieving that. Alternatively, we can use the Gradle Plugin Portal.

This will allow our plugin to be accessible by wide Business plan writing services ghana Community. This will automatically compile and add gradleApi dependencies. It will also perform plugin metadata validation as a part of the gradle jar task. To test that our plugin works properly and it's properly applied to the Project, we can use org. ProjectBuilder to create an instance of the Project. We can then gradle writing custom plugin if the plugin was applied and proper tasks are present in our Project instance.

We can use standard JUnit tests to do that:. In this article, we've shown the basics of writing custom plugins in Gradle. To go more in-depth into plugin creation, have a look at the Gradle Documentation. And, as always, all the code samples can be found over on Github. Persistence The Persistence with Spring guides.

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Gradle writing custom plugin



Most Gradle builds use at least a few plugins to add extra functionality, so why not make use of this powerful mechanism by writing your own Gradle plugins? So what exactly is a Gradle plugin? Often these tasks will be automatically configured into the Gradle task graph through a dependsOn relationship. This behaviour may include configuring certain elements of the build.

For example, the Java plugin configures the main and test source sets. For example, with the Java plugin you can configure tests to be included or excluded by tag, like this:. The functionality will include:. So what classes do we need in a plugin, and how do they relate to our specific requirements for this example? When you write a plugin in Gradle, if you want to share it between multiple projects then the best option is to create the plugin in a separate repository.

This way, you can publish it to a private or public Maven repository, and then apply it in whatever project you need:. The extension class represents the configuration for the plugin. We have two final properties representing the input files. This is useful in Gradle since plugins are normally applied before they are configured. Gradle provides a very nice mechanism for writing an integration test for our Gradle plugin.

It allows us to:. We can now run the test by executing. Debugging plugin tests: to debug plugin code executed during a test run, you need to add withDebug true to the GradleRunner.

This will help get our jar file in the right Maven format, and provide the publishToMavenLocal task. We also need to do some additional configuration to the java-gradle-plugin , so it can add relevant details required for us to be able to reference the plugin from another project.

This file defines the way that consumers of the plugin will reference it. Now just run. The file-diff artifact is simply a reference to the file-diff-plugin artifact. This means we can reference the plugin in the Gradle plugin DSL as simply com. We can now make use of our plugin here to make things even easier. Clone this GitHub repository or use your own project if you like. We need to update settings.

Do this by adding this block of code to the very beginning of the file:. Now run the task with. Writing simple plugins can be a surprisingly straightforward process. If you liked this article, be sure to check out other articles here on my blog on the subject of build automation. I created my own custom plugin, which just writes a sentence into an output file, including an input parameter value.

I used your tutorial as a reference, but I found a few issues. My plugin was not being found in the test, because I was creating the build. The GradleRunner builder was throwing NullPointerException, because of the way I declared the input variable in the task class. Hi Cristian. Thanks for the comment.

Is your repo public? If you make it public I can take a look to see what the differences are in your repo. I followed your gradle plugin tutorial, and was trying to write on plugin. Was able to create successfully one plugin.

But with the similar Idea I am facing some issue here. There should be quotes. HI, Tom really amazing article!! Quick question, how do you debug this groovy code on intellij? Is necessary special configuration for this? Your email address will not be published.

Save my name, email, and website in this browser for the next time I comment. To keep up to date with all things to do with scaling developer productivity , subscribe to my monthly newsletter! First Name. Email address:. Skip to content.

Last Updated on October 19, Most Gradle builds use at least a few plugins to add extra functionality, so why not make use of this powerful mechanism by writing your own Gradle plugins? Gradle plugins overview So what exactly is a Gradle plugin? Configuration Additionally, many plugins allow you to configure them in specific ways. The functionality will include: ability to configure the two files to be diffed e. This may be to create some tasks that can be executed in the build, or configure the build in some way.

For the file-diff plugin it will contain the two input files whose size will be compared. An instance of it is normally created and bound to a task name made available to the user to run in a Gradle command. Publishing Gradle plugins When you write a plugin in Gradle, if you want to share it between multiple projects then the best option is to create the plugin in a separate repository.

ObjectFactory import org. Property import javax. DefaultTask import org. Property import org. InputFile import org. OutputFile import org. The plugin will be responsible for mapping the properties from the extension to those on the task.

It uses the two file inputs to work out which is the larger, and generated some text output. The result is then written to the resultFile and standard output. Plugin import org.

This method gets called when the plugin gets applied in the build. This means that in the build. It allows us to: dynamically generate a build. GradleRunner import org. Rule import org. TemporaryFolder import spock. Specification import static org. We also append to the build. Update settings. Final thoughts Writing simple plugins can be a surprisingly straightforward process.

Share on Facebook. Follow us. Related Posts. How to use Gradle api vs. Hi Tom, I followed your gradle plugin tutorial, and was trying to write on plugin. Hi Alexandre. Then you can run the test in debug mode in IntelliJ. Gradle have a very helpful article on this topic. Hope it helps! Leave a Reply Cancel reply Your email address will not be published. First Name Email address:. I use cookies to ensure that I give you the best experience on my website.

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I realize that I could just call the Java code with project. Note the uploadArchives task: You must run this task to make the plugin available to the consumer script. Plugin classes must implement the org. Plugin interface.

Task classes typically extend the org. DefaultTask class. It doesn't matter which JVM language is used for this. The Gradle codebase contains many plugin and task classes implemented in Java. How to build and ship a plugin is another question, again mostly unrelated to which language is used. Learn more.

Asked 7 years, 3 months ago. Active 2 years, 10 months ago. Viewed 19k times. The Gradle plugin documentation says this is possible: You can implement a custom plugin in any language you like, provided the implementation ends up compiled as bytecode. How to get Gradle to recognize the Java classes and tasks so you can use them in a build? Can you just reference the plugin class like you do for the Groovy equivalent?

Joe Fernandez Joe Fernandez 4, 4 4 gold badges 23 23 silver badges 22 22 bronze badges. Active Oldest Votes. Here's a basic, stand-alone, Java-based Gradle plugin and the steps to get it working: Make sure Gradle 1.

Project; import org. DefaultTask; import org. Specifying repository url: uri '.. You could instead export to the default local repo. And import from mavenLocal. I created an Android Studio project based on Joe's descriptions at github. Feel free to fork or copy-pasta. Not working for me. I would like to propose a few amendments to Joe's great answer.

HI, Tom really amazing article!! Quick question, how do you debug this groovy code on intellij? Is necessary special configuration for this? Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

To keep up to date with all things to do with scaling developer productivity , subscribe to my monthly newsletter! First Name. Email address:. Skip to content. Last Updated on October 19, Most Gradle builds use at least a few plugins to add extra functionality, so why not make use of this powerful mechanism by writing your own Gradle plugins?

Gradle plugins overview So what exactly is a Gradle plugin? Configuration Additionally, many plugins allow you to configure them in specific ways.

The functionality will include: ability to configure the two files to be diffed e. This may be to create some tasks that can be executed in the build, or configure the build in some way. For the file-diff plugin it will contain the two input files whose size will be compared. An instance of it is normally created and bound to a task name made available to the user to run in a Gradle command.

Publishing Gradle plugins When you write a plugin in Gradle, if you want to share it between multiple projects then the best option is to create the plugin in a separate repository.

ObjectFactory import org. Property import javax. DefaultTask import org. Property import org. InputFile import org. OutputFile import org. The plugin will be responsible for mapping the properties from the extension to those on the task.

It uses the two file inputs to work out which is the larger, and generated some text output. The result is then written to the resultFile and standard output. Plugin import org. This method gets called when the plugin gets applied in the build. This means that in the build. It allows us to: dynamically generate a build.

GradleRunner import org. Rule import org. TemporaryFolder import spock. Specification import static org. We also append to the build. Update settings. Final thoughts Writing simple plugins can be a surprisingly straightforward process. Share on Facebook. Follow us. Related Posts. How to use Gradle api vs.

Hi Tom, I followed your gradle plugin tutorial, and was trying to write on plugin. Hi Alexandre. Then you can run the test in debug mode in IntelliJ. Gradle have a very helpful article on this topic.

Hope it helps!

Introduction to writing Gradle plugins

However, after multiple hours of Googling and reading, I have yet to find any explanation of how to create a Gradle custom plugin with Java. It seems like you could create the code for it in a directory like: To learn more, see our tips on writing great answers. Sign . I created my own custom plugin, which just writes a sentence into an output file, including an input parameter value. I used your tutorial as a reference, but I found a few issues. plugins { // Apply the Java Gradle plugin development plugin to add support for developing Gradle plugins id 'java-gradle-plugin' } repositories { // Use jcenter for resolving dependencies.


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