Use a newer version of Gradle that builds on modern JVM versions.

build.gradle

@@ -11,10 +11,12 @@
  *   - sonatypePassword
  */
 
-apply plugin: 'java'
-apply plugin: 'fatjar'
-apply plugin: 'maven'
-apply plugin: 'signing'
+plugins {
+  id 'java'
+  id 'maven'
+  id 'signing'
+  id "com.github.johnrengelman.shadow" version "2.0.4"
+}
 
 group         = 'com.sendgrid'
 version       = '4.2.1'
@@ -31,19 +33,6 @@ if (!hasProperty("sonatypeUsername")) {
   ext.sonatypePassword = null
 }
 
-task wrapper(type: Wrapper) {
-  gradleVersion = '1.8'
-}
-
-buildscript {
-  dependencies {
-    classpath 'eu.appsatori:gradle-fatjar-plugin:0.1.2' // adds fatJar task
-  }
-  repositories {
-    mavenCentral()
-  }
-}
-
 dependencies {
   compile 'com.sendgrid:java-http-client:4.1.0'
   compile 'com.fasterxml.jackson.core:jackson-core:2.9.5'
@@ -64,33 +53,17 @@ allprojects {
   }
 }
 
-// adds 'with-dependencies' to the fatJar name
-fatJar {
-  classifier 'jar'
-  baseName "sendgrid"
+shadowJar {
   manifest {
-    attributes("Implementation-Title": "SendGrid", "Implementation-Version": version)
+        attributes("Implementation-Title": "SendGrid", "Implementation-Version": version)
   }
 }
 
-// copy fatJar to base project directory so they will be in git (and on github for download)
-build << {
+// copy shadowJar to base project directory so they will be in git (and on github for download)
+assemble.doLast {
   copy {
-    println "Copying ${fatJar.archiveName} to $projectDir/repo/com/sendgrid"
-    from("$buildDir/libs/${fatJar.archiveName}")
-    into("$projectDir/repo/com/sendgrid")
-  }
-  tasks.renameSendGridVersionJarToSendGridJar.execute()
-}
-
-task renameSendGridVersionJarToSendGridJar {
-  doLast {
-    file("$projectDir/repo/com/sendgrid/${fatJar.archiveName}").renameTo(file("$projectDir/repo/com/sendgrid/sendgrid-java-latest.jar"))
-    copy {
-      from("$buildDir/libs/${fatJar.archiveName}")
-      into("$projectDir/repo/com/sendgrid")
-    }
-    file("$projectDir/repo/com/sendgrid/${fatJar.archiveName}").renameTo(file("$projectDir/repo/com/sendgrid/sendgrid-java-${version}.jar"))
+    from("$buildDir/libs/${shadowJar.archiveName}")
+    into("$projectDir")
   }
 }
 
@@ -166,7 +139,7 @@ uploadArchives {
 }
 
 artifacts {
-  archives fatJar
+  archives shadowJar
   archives jar
   archives javadocJar
   archives sourcesJar

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Mon May 26 17:38:02 PDT 2014
+#Wed Oct 03 16:23:45 MDT 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-1.8-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-all.zip