Migrate to Gradle maven-publish plugin from deprecated maven plugin

build.gradle

 apply plugin: 'application'
 apply plugin: 'java'
 apply plugin: 'eclipse'
-apply plugin: 'maven'
+apply plugin: 'maven-publish'
+apply plugin: 'signing'
 
 
 project.version = '3.2.14-SNAPSHOT'
@@ -13,6 +14,8 @@ wrapper {
   distributionType = Wrapper.DistributionType.ALL
 }
 
+final isSnapshot = project.version.endsWith("-SNAPSHOT")
+
 sourceCompatibility = 7
 targetCompatibility = 7
 
@@ -64,56 +67,57 @@ compileJava {
   dependsOn = ['writeVersion']
 }
 
-if (project.hasProperty('ossrhUsername') && project.hasProperty('ossrhPassword')) {
-
-  apply plugin: 'signing'
-
-  signing {
-    sign configurations.archives
-  }
-  uploadArchives {
-    repositories {
-      mavenDeployer {
-        beforeDeployment { MavenDeployment deployment -> signing.signPom(deployment) }
-
-        repository(url: "https://oss.sonatype.org/service/local/staging/deploy/maven2/") {
-          authentication(userName: ossrhUsername, password: ossrhPassword)
+publishing {
+  publications {
+    mavenJava(MavenPublication) {
+      from components.java
+      artifact sourcesJar
+      artifact javadocJar
+
+      pom {
+        name = 'SableCC - Stups fork'
+        description = 'This version of SableCC enriches the abstract syntax tree with information about tokens.'
+        url = 'https://github.com/bendisposto/sablecc-stups'
+
+        licenses {
+          license {
+            name = 'GNU Lesser General Public License, Version 2.1'
+            url = 'http://www.gnu.org/licenses/lgpl-2.1.html'
+          }
         }
 
-        snapshotRepository(url: "https://oss.sonatype.org/content/repositories/snapshots/") {
-          authentication(userName: ossrhUsername, password: ossrhPassword)
+        scm {
+          connection = 'scm:git:git://github.com/bendisposto/sablecc-stups.git'
+          developerConnection = 'scm:git:git@github.com:bendisposto/sablecc-stups.git'
+          url = 'https://github.com/bendisposto/sablecc-stups'
         }
 
-        pom.project {
-          name 'SableCC - Stups fork'
-          packaging 'jar'
-          // optionally artifactId can be defined here
-          description 'This version of SableCC enriches the abstract syntax tree with information about tokens.'
-          url 'https://github.com/bendisposto/sablecc-stups'
-
-          licenses {
-            license {
-              name 'GNU Lesser General Public License, Version 2.1'
-              url 'http://www.gnu.org/licenses/lgpl-2.1.html'
-            }
-          }
-
-          scm {
-            connection 'scm:git:git://github.com/bendisposto/sablecc-stups.git'
-            developerConnection 'scm:git:git@github.com:bendisposto/sablecc-stups.git'
-            url 'https://github.com/bendisposto/sablecc-stups'
+        developers {
+          developer {
+            id = 'bendisposto'
+            name = 'Jens Bendisposto'
+            email = 'jens@bendisposto.de'
           }
+        }
+      }
+    }
+  }
 
-
-          developers {
-            developer {
-              id 'bendisposto'
-              name 'Jens Bendisposto'
-              email 'jens@bendisposto.de'
-            }
-          }
+  repositories {
+    maven {
+      final releasesRepoUrl = "https://oss.sonatype.org/service/local/staging/deploy/maven2"
+      final snapshotsRepoUrl = "https://oss.sonatype.org/content/repositories/snapshots"
+      url isSnapshot ? snapshotsRepoUrl : releasesRepoUrl
+      if (project.hasProperty('ossrhUsername') && project.hasProperty('ossrhPassword')) {
+        credentials {
+          username project.ossrhUsername
+          password project.ossrhPassword
         }
       }
     }
   }
 }
+
+signing {
+  sign publishing.publications.mavenJava
+}