Use nexus-staging plugin to automate sync to Maven central

Author: graemerocher

README.md

@@ -60,9 +60,6 @@ After pushing these changes to the repository you must wait for [the build](http
 
 The [Travis CI](https://travis-ci.org/grails/grails-core) build will automatically upload the tagged release to Github and be available of the [Releases page](https://github.com/grails/grails-core/releases).
 
-Note: Although by default Grails uses Artefactory to resolve dependencies, it is useful to have them in Maven Central too. To ensure they go to Maven Central login to [Sonatype OSS Nexus](https://oss.sonatype.org) with your account details then "Close" and "Release" the staged JAR files.
-
-
 License
 ---
 

build.gradle

@@ -12,6 +12,7 @@ buildscript {
         classpath "com.netflix.nebula:gradle-extra-configurations-plugin:2.2.0"
         classpath "com.github.adrianbk:gradle-travisci-trigger-plugin:1.0.0"
         classpath 'com.bmuschko:gradle-nexus-plugin:2.3'
+        classpath "io.codearte.gradle.nexus:gradle-nexus-staging-plugin:0.5.3"
         classpath 'net.gvmtool:gradle-sdkvendor-plugin:0.3.1'
     }
 }
@@ -203,6 +204,7 @@ subprojects { project ->
         apply plugin: 'com.bmuschko.nexus'
         apply plugin: 'maven-publish'
         apply plugin: 'com.jfrog.bintray'
+        apply plugin: 'io.codearte.nexus-staging'
     }
     apply plugin: 'eclipse'
     apply plugin: 'idea'

travis-build.sh

@@ -54,7 +54,7 @@ if [[ $TRAVIS_PULL_REQUEST == 'false' && $EXIT_STATUS -eq 0
     echo "Running Gradle publish for branch $TRAVIS_BRANCH"
 
     if [[ $TRAVIS_TAG =~ ^v[[:digit:]] ]]; then
-        ./gradlew -Psigning.keyId="$SIGNING_KEY" -Psigning.password="$SIGNING_PASSPHRASE" -Psigning.secretKeyRingFile="${TRAVIS_BUILD_DIR}/secring.gpg" publish uploadArchives || EXIT_STATUS=$?
+        ./gradlew -Psigning.keyId="$SIGNING_KEY" -Psigning.password="$SIGNING_PASSPHRASE" -Psigning.secretKeyRingFile="${TRAVIS_BUILD_DIR}/secring.gpg" publish uploadArchives closeAndPromoteRepository || EXIT_STATUS=$?
         ./gradlew assemble || EXIT_STATUS=$?
 
         # Configure GIT