= Gradle

Your project should be able to produce binary distributions, a feat typically achieved by configuring
the `link:https://docs.gradle.org/current/userguide/application_plugin.html[application]` plugin.

You also have to configure the xref:tools:jreleaser-gradle.adoc[jreleaser-gradle-plugin]. We recommend using the
link:https://kordamp.org/kordamp-gradle-plugins/[Kordamp plugins] as they provide additional benefits,
however their use is optional. A sample project using Kordamp may look like this:

[source,groovy]
[subs="attributes"]
.build.gradle
----
plugins {
    id 'java-library'
    id 'application'
    id 'org.kordamp.gradle.java-project' version '0.45.0'
    id 'org.jreleaser' version '{jreleaser-version}'
}

application {
    mainClass = 'com.acme.Main'
}

config {
    info {
        name          = 'app'
        description   = 'App'
        inceptionYear = '2021'
        vendor        = 'Acme'

        links {
            website      = 'https://acme.com/app'
            issueTracker = 'https://github.com/duke/app/issues'
            scm          = 'https://github.com/duke/app.git'
        }

        scm {
            url                 = 'https://github.com/duke/app'
            connection          = 'scm:git:https://github.com/duke/app.git'
            developerConnection = 'scm:git:git@github.com:duke/app.git'
        }
        
        people {
            person {
                id    = 'duke'
                name  = 'Java Duke'
                roles = ['developer', 'author']
            }
        }
    }

    licensing {
        licenses {
            license {
                id = 'Apache-2.0'
            }
        }
    }
}

jreleaser {
    release {
        github {
            owner = 'duke'
            overwrite = true
        }
    }
}
----

This setup configures the project with the following

* Generate additional JAR manifest entries.
* Generate a `-sources` JAR file with all sources per project.
* Configure the javadoc task for each project using information found in the config block, such as author,
  copyright year, default settings.
* Generate a `-javadoc` JAR file with the output of the javadoc task, per project.
* Configure the license plugin with the license details
* Configure the maven-publish plugin. The `-sources` and `-javadoc` JARs are automatically added to the default publication.
* Configure the generated POM.
* Configure the jacoco plugin.
* Generate a source stats task.
* Generate a task to collect pretty-printed sources.

Whereas a plain project would look like this:

[source,groovy]
[subs="attributes"]
.build.gradle
----
plugins {
    id 'java-library'
    id 'application'
    id 'org.jreleaser' version '{jreleaser-version}'
}

application {
    mainClass = 'com.acme.Main'
}

jreleaser {
    project {
        website = 'https://acme.com/app'
        authors = ['Duke']
        license = 'Apache-2.0'
    }

    release {
        github {
            owner = 'duke'
            overwrite = true
        }
    }
}
----

The JReleaser Gradle plugin detects the use of the `application` plugin and automatically configures the output files
from the `assembleDist` task.

Edit the file to suite your needs. Once you have edited the file you may verify its configuration by invoking

[source]
----
$ gradle jreleaserConfig
----

At any time you may invoke any of the other commands, but when it's time to make a release you have to invoke

[source]
----
$ gradle jreleaseFullRelease
> Task :compileJava
> Task :processResources NO-SOURCE
> Task :classes
> Task :minpom
> Task :jar
> Task :startScripts
> Task :distTar
> Task :distZip
> Task :assembleDist

> Task :jreleaserFullRelease
[INFO]  JReleaser {jreleaser-version}
[INFO]    - basedir set to /Home/duke/app
[INFO]  Loading properties from /Home/duke/.jreleaser/config.properties
[INFO]  Validating configuration
[INFO]  Project version set to 1.0.0
[INFO]  Release is not snapshot
[INFO]  Timestamp is 2021-03-28T12:25:16.219+02:00
[INFO]  HEAD is at c3e39f1
[INFO]  dryrun set to false
[INFO]  Generating changelog: out/jreleaser/release/CHANGELOG.md
[INFO]  Calculating checksums
[INFO]    [checksum] target/distributions/app/app-1.0.0.zip
[INFO]  Signing files
[INFO]  Signing is not enabled. Skipping
[INFO]  Uploading is not enabled. Skipping.
[INFO]  Releasing to https://github.com/duke/app
[INFO]   - Uploading app-1.0.0.zip
[INFO]   - Uploading checksums.txt
[INFO]  Preparing distributions
[INFO]    - Preparing app distribution
[INFO]  Packaging distributions
[INFO]    - Packaging app distribution
[INFO]  Publishing distributions
[INFO]    - Publishing app distribution
[INFO]  Announcing release
[INFO]  Announcing is not enabled. Skipping.
[INFO]  JReleaser succeeded after 0.894s
[INFO]  Writing output properties to out/jreleaser/output.properties

--------------------------------------------------------------------
1 projects                                       CONF        EXEC
--------------------------------------------------------------------
: .................................. SUCCESS [  0.287 s] [  2.182 s]
--------------------------------------------------------------------
----

This command performs the following actions:

* checksums all artifacts.
* signs all files (if signing is enabled).
* creates a release at the chosen Git repository.
* prepares, packages, and uploads configured packagers (brew, jbang, etc).
* announces the release (if configured).

