Move from Maven to Gradle

This is a minimized patch based on the work by @mrmcduff-stripe here:

#416

.gitignore

@@ -6,3 +6,7 @@ tags
 target
 .idea
 *.iml
+
+# Gradle files
+.gradle/*
+build/*

.travis.yml

@@ -1,17 +1,24 @@
 language: java
 
+addons:
+  hosts:
+    - short-hostname
+  hostname: short-hostname
+
 matrix:
   include:
     - jdk: openjdk7
+      dist: precise
     - jdk: oraclejdk7
       dist: precise
     - jdk: oraclejdk8
     - jdk: oraclejdk9
 
-install: mvn install -Dgpg.skip=true -DskipTests
-
 notifications:
   email:
     on_success: never
 
 sudo: false
+
+script:
+  - ./gradlew clean test

README.md

@@ -103,16 +103,15 @@ servers.
 
 ## Testing
 
-You must have Maven installed. To run the tests:
+You must have Gradle installed. To run the tests:
 
-    mvn test
+    ./gradlew test
 
-You can run particular tests by passing `-D test=Class#method`. Make sure you use the fully qualified class name to differentiate between
-unit and functional tests. For example:
+You can run particular tests by passing `--tests Class#method`. Make sure you use the fully qualified class name. For example:
 
-    mvn test -D test=com.stripe.model.AccountTest
-    mvn test -D test=com.stripe.functional.ChargeTest
-    mvn test -D test=com.stripe.functional.ChargeTest#testChargeCreate
+    ./gradlew test --tests com.stripe.model.AccountTest
+    ./gradlew test --tests com.stripe.functional.ChargeTest
+    ./gradlew test --tests com.stripe.functional.ChargeTest.testChargeCreate
 
 <!--
 # vim: set tw=79:

build.gradle

@@ -0,0 +1,35 @@
+apply plugin: 'java'
+apply plugin: 'maven'
+
+sourceCompatibility = 1.7
+targetCompatibility = 1.7
+tasks.withType(JavaCompile) {
+	options.encoding = 'UTF-8'
+}
+
+configurations.all {
+}
+
+buildscript {
+    repositories {
+        jcenter()
+        //Add only for SNAPSHOT versions
+        //maven { url "http://oss.sonatype.org/content/repositories/snapshots/" }
+    }
+    dependencies {
+        classpath "io.codearte.gradle.nexus:gradle-nexus-staging-plugin:0.11.0"
+    }
+}
+
+repositories {
+     jcenter()
+}
+
+dependencies {
+    compile group: 'com.google.code.gson', name: 'gson', version:'2.2.4'
+    testCompile group: 'com.google.guava', name: 'guava', version:'18.0'
+    testCompile group: 'junit', name: 'junit', version:'4.10'
+    testCompile group: 'org.mockito', name: 'mockito-all', version:'1.10.19'
+}
+
+apply from: 'deploy.gradle'

deploy.gradle

@@ -0,0 +1,121 @@
+/*
+ * Based on the example at Chris Banes's repository that allows signing
+ * without manually creating a maven file.
+ *
+ * The original can be found at
+ * https://raw.github.com/chrisbanes/gradle-mvn-push/master/gradle-mvn-push.gradle
+ */
+
+apply plugin: 'maven'
+apply plugin: 'signing'
+apply plugin: 'io.codearte.nexus-staging'
+
+nexusStaging {
+    packageGroup = GROUP
+}
+
+def isReleaseBuild() {
+    return VERSION_NAME.contains("SNAPSHOT") == false
+}
+
+def getReleaseRepositoryUrl() {
+    return hasProperty('RELEASE_REPOSITORY_URL') ? RELEASE_REPOSITORY_URL
+            : "https://oss.sonatype.org/service/local/staging/deploy/maven2/"
+}
+
+def getSnapshotRepositoryUrl() {
+    return hasProperty('SNAPSHOT_REPOSITORY_URL') ? SNAPSHOT_REPOSITORY_URL
+            : "https://oss.sonatype.org/content/repositories/snapshots/"
+}
+
+def getRepositoryUsername() {
+    return hasProperty('NEXUS_USERNAME') ? NEXUS_USERNAME : ""
+}
+
+def getRepositoryPassword() {
+    return hasProperty('NEXUS_PASSWORD') ? NEXUS_PASSWORD : ""
+}
+
+afterEvaluate { project ->
+    uploadArchives {
+        repositories {
+            mavenDeployer {
+                beforeDeployment { MavenDeployment deployment -> signing.signPom(deployment) }
+
+                pom.groupId = GROUP
+                pom.artifactId = POM_ARTIFACT_ID
+                pom.version = VERSION_NAME
+
+                repository(url: getReleaseRepositoryUrl()) {
+                    authentication(userName: getRepositoryUsername(), password: getRepositoryPassword())
+                }
+
+                snapshotRepository(url: getSnapshotRepositoryUrl()) {
+                    authentication(userName: getRepositoryUsername(), password: getRepositoryPassword())
+                }
+
+                pom.project {
+                    name POM_NAME
+                    description POM_DESCRIPTION
+                    url POM_URL
+                    packaging POM_PACKAGING
+
+                    scm {
+                        url POM_SCM_URL
+                        connection POM_SCM_CONNECTION
+                        developerConnection POM_SCM_DEV_CONNECTION
+                    }
+
+                    licenses {
+                        license {
+                            name POM_LICENCE_NAME
+                            url POM_LICENCE_URL
+                            distribution POM_LICENCE_DIST
+                        }
+                    }
+
+                    developers {
+                        developer {
+                            id POM_DEVELOPER_ID
+                            name POM_DEVELOPER_NAME
+                            email POM_DEVELOPER_EMAIL
+                        }
+                    }
+
+                    organization {
+                        name POM_DEVELOPER_NAME
+                        url POM_ORGANIZATION_URL
+                    }
+                }
+            }
+        }
+    }
+
+    signing {
+        required { isReleaseBuild() &&
+        (gradle.taskGraph.hasTask("uploadArchives") || gradle.taskGraph.hasTask("publish"))}
+        sign configurations.archives
+    }
+
+    task makeJavadocs(type: Javadoc) {
+        source = sourceSets.main.allJava
+        classpath = configurations.compile
+        failOnError = true
+    }
+
+    task makeJavadocsJar(type: Jar, dependsOn: makeJavadocs) {
+        classifier = 'javadoc'
+        from makeJavadocs.destinationDir
+    }
+
+    task sourcesJar(type: Jar) {
+        classifier = 'sources'
+        from sourceSets.main.java
+    }
+
+    artifacts {
+        archives jar
+        archives sourcesJar
+        archives makeJavadocsJar
+    }
+}

gradle.properties

@@ -0,0 +1,19 @@
+GROUP=com.stripe
+VERSION_NAME=5.22.0
+
+POM_URL=https://github.com/stripe/stripe-java
+POM_SCM_URL=git@github.com:stripe/stripe-java.git
+POM_SCM_CONNECTION=scm:git:git@github.com:stripe/stripe-java.git
+POM_SCM_DEV_CONNECTION=scm:git:git@github.com:stripe/stripe-java.git
+POM_LICENCE_NAME=The MIT License
+POM_LICENCE_URL=https://opensource.org/licenses/MIT
+POM_LICENCE_DIST=repo
+POM_DEVELOPER_ID=stripe
+POM_DEVELOPER_NAME=Stripe
+POM_DEVELOPER_EMAIL=support+java@stripe.com
+
+POM_DESCRIPTION=Stripe Java Bindings
+POM_NAME=stripe-java
+POM_ARTIFACT_ID=stripe-java
+POM_PACKAGING=jar
+POM_ORGANIZATION_URL=https://stripe.com

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.2.1-bin.zip