Gradle - Deployment


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Gradle offers several ways to deploy build artifacts repositories. When deploying signatures for your artifacts to a Maven repository, you will also want to sign the published POM file.

Maven-publish Plugin

By default, maven-publish plugin is provided by Gradle. It is used to publish the gradle script. Take a look into the following code.

apply plugin: 'java'
apply plugin: 'maven-publish'

publishing {
   publications {
      mavenJava(MavenPublication) {
         from components.java
      }
   }

   repositories {
      maven {
         url "$buildDir/repo"
      }
   }
}

There are several publish options, when the Java and the maven-publish plugin is applied. Take a look at the following code, it will deploy the project into a remote repository.

apply plugin: 'groovy'
apply plugin: 'maven-publish'

group 'workshop'
version = '1.0.0'

publishing {
   publications {
      mavenJava(MavenPublication) { 
         from components.java 
      }
   }
	
   repositories {
      maven {
          default credentials for a nexus repository manager
         credentials {
            username 'admin'
            password 'admin123'
         }
         // url to the releases maven repository
            url "http://localhost:8081/nexus/content/repositories/releases/"
      }
   }
}

Converting from Maven to Gradle

There is a special command for converting Apache Maven pom.xml files to Gradle build files, if all used Maven plug-ins are known to this task.

In this section the following pom.xml maven configuration will be converted to a Gradle project.

<project xmlns = "http://maven.apache.org/POM/4.0.0" 
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0
   http://maven.apache.org/xsd/maven-4.0.0.xsd">
	
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.example.app</groupId>
   <artifactId>example-app</artifactId>
   <packaging>jar</packaging>
   
   <version>1.0.0-SNAPSHOT</version>
	
   <dependencies>
      <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>

         <version>4.11</version>
         <scope>test</scope>
      </dependency>
   </dependencies>
	
</project>

You can use the following command on the command line that results in the following Gradle configuration.

C:\> gradle init --type pom

The init task depends on the wrapper task so that a Gradle wrapper is created.

The resulting build.gradle file looks similar to this −

apply plugin: 'java'
apply plugin: 'maven'

group = 'com.example.app'
version = '1.0.0-SNAPSHOT'

description = """"""

sourceCompatibility = 1.5
targetCompatibility = 1.5

repositories {
   maven { url "http://repo.maven.apache.org/maven2" }
}

dependencies {
   testCompile group: 'junit', name: 'junit', version:'4.11'
}
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