#6 Publish releases to Maven Central via OSSRH (OSS Repository Hosting)

.github/workflows/publish-release.yml

@@ -0,0 +1,40 @@
+# This workflow will build a package using Gradle and then publish it to OSSRH when a release is created
+# For more information see: https://github.com/actions/setup-java#publishing-using-gradle
+
+name: Publish to OSSRH when released
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Git Checkout
+      uses: actions/checkout@v2
+    - name: Set up JDK 1.8 (Current LTS Release)
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+
+    - name: Extract secring.gpg to sign files
+      run: echo -n $SECRING_GPG | base64 --decode > micronaut-camunda-bpm-feature/secring.gpg
+      env:
+        SECRING_GPG: ${{ secrets.SECRING_GPG }}
+
+    # The GITHUB_REF tag comes in the format 'refs/tags/v0.0.1'. If we split on '/' and take the 3rd value, we can get the release version, e.g. v.0.0.1
+    # We then remove the leading "v", e.g. 0.0.1
+    - name: Build release based on tag and publish to OSSRH
+      run: |
+        echo "${GITHUB_ACTOR} is publishing tag ${GITHUB_REF}."
+        echo "${GITHUB_REF}" | cut -d "/" -f3 | grep --regexp '^v[[:digit:]]\+\.[[:digit:]]\+\.[[:digit:]]\+$' > /dev/null #Validate format with regular expression
+        RELEASE_VERSION=$(echo "${GITHUB_REF}" | cut -d "/" -f3 | sed 's/v//')
+        echo "New release version: ${RELEASE_VERSION}"
+        ./gradlew -Pversion=${RELEASE_VERSION} build --warning-mode=fail
+        ./gradlew -Pversion=${RELEASE_VERSION} -Psigning.password=${SIGNING_PWD} publish --info
+      env:
+        OSSRH_PWD: ${{ secrets.OSSRH_PWD }}
+        SIGNING_PWD: ${{ secrets.SIGNING_PWD }}

gradle.properties

@@ -1 +1,3 @@
+# The project property 'version' is overwritten via .github/workflows/publish-release.yml
+version=0.0.1-SNAPSHOT
 micronautVersion=1.3.3

micronaut-camunda-bpm-example/build.gradle

@@ -2,7 +2,6 @@ plugins {
     id "application"
 }
 
-version "0.0.1-SNAPSHOT"
 group "info.novatec"
 
 configurations {

micronaut-camunda-bpm-feature/build.gradle

@@ -1,8 +1,9 @@
 plugins {
     id "application"
+    id "maven-publish"
+    id "signing"
 }
 
-version "0.0.1-SNAPSHOT"
 group "info.novatec"
 
 configurations {
@@ -53,3 +54,50 @@ java {
     withJavadocJar()
     withSourcesJar()
 }
+
+// based on https://docs.gradle.org/current/userguide/publishing_maven.html#sec:modifying_the_generated_pom and https://central.sonatype.org/pages/requirements.html#sufficient-metadata
+publishing {
+    publications {
+        mavenJava(MavenPublication) {
+            from components.java
+            pom {
+                name = 'micronaut-camunda-bpm-feature'
+                description = 'Integration between Micronaut and Camunda BPM Process Engine'
+                url = 'https://github.com/NovatecConsulting/micronaut-camunda-bpm'
+                licenses {
+                    license {
+                        name = 'The Apache License, Version 2.0'
+                        url = 'https://www.apache.org/licenses/LICENSE-2.0.txt'
+                    }
+                }
+                developers {
+                    developer {
+                        name = 'The micronaut-camunda-bpm Team at Novatec Consulting GmbH'
+                        email = '[email protected]'
+                        organization = 'Novatec Consulting GmbH'
+                        organizationUrl = 'https://www.novatec-gmbh.de'
+                    }
+                }
+                scm {
+                    connection = 'scm:git:https://github.com/NovatecConsulting/micronaut-camunda-bpm.git'
+                    developerConnection = 'scm:git:https://github.com/NovatecConsulting/micronaut-camunda-bpm.git'
+                    url = 'https://github.com/NovatecConsulting/micronaut-camunda-bpm'
+                }
+            }
+        }
+    }
+    repositories {
+        maven {
+            url = version.endsWith('SNAPSHOT') ? 'https://oss.sonatype.org/content/repositories/snapshots/' : 'https://oss.sonatype.org/service/local/staging/deploy/maven2'
+            credentials {
+                username 'micronaut-camunda'
+                password "$System.env.OSSRH_PWD"
+            }
+        }
+    }
+}
+
+// see https://docs.gradle.org/current/userguide/signing_plugin.html#sec:specifying_what_to_sign and https://central.sonatype.org/pages/working-with-pgp-signatures.html#generating-a-key-pair
+signing {
+    sign publishing.publications.mavenJava
+}

micronaut-camunda-bpm-feature/gradle.properties

@@ -0,0 +1,5 @@
+# see https://docs.gradle.org/current/userguide/signing_plugin.html#signing_plugin
+# The project property 'signing.password' is set via .github/workflows/publish-release.yml
+signing.keyId=2A0D5A78
+signing.secretKeyRingFile=secring.gpg
+#signing.password=