#963 Update Gradle build mechanism to support Kotlin DSL with Gradle v6.3

dl4j-examples/build.gradle.kts

@@ -0,0 +1,83 @@
+/*******************************************************************************
+ * Copyright (c) 2015-2019 Skymind, Inc.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License, Version 2.0 which is available at
+ * https://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ ******************************************************************************/
+
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+    `java-library`
+    id("application")
+    id("kotlin")
+}
+
+allprojects {
+    val kotlinVersion: String by extra("1.3.72")
+    val dl4jVersion: String by extra("1.0.0-beta6")
+    val slf4jVersion: String by extra("1.7.30")
+}
+
+repositories {
+    maven("https://oss.sonatype.org/content/repositories/snapshots")
+    jcenter()
+}
+
+group = "org.deeplearning4j.examples"
+application {
+    mainClassName = "org.deeplearning4j.examples.feedforward.mnist.MLPMnistSingleLayerExample"
+}
+
+tasks.withType<KotlinCompile>().all {
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_1_8.toString()
+    }
+}
+
+sourceSets {
+    main {
+        java{
+            srcDir("src/main/java")
+            /**
+             * Kotlin examples do not use java sources, so let's exclude them all.
+             */
+            exclude("**")
+        }
+    }
+}
+
+internal val singleLayerExample = tasks.register<JavaExec>("MLPMnistSingleLayerExample") {
+    classpath = sourceSets.main.get().runtimeClasspath
+    main = "org.deeplearning4j.examples.feedforward.mnist.MLPMnistSingleLayerExample"
+}
+
+internal val twoLayerExample = tasks.register<JavaExec>("MLPMnistTwoLayerExample") {
+    classpath = sourceSets.main.get().runtimeClasspath
+    main = "org.deeplearning4j.examples.feedforward.mnist.MLPMnistTwoLayerExample"
+}
+
+dependencies {
+    val kotlinVersion = project.extra["kotlinVersion"].toString()
+    val dl4jVersion = project.extra["dl4jVersion"].toString()
+    val slf4jVersion = project.extra["slf4jVersion"].toString()
+
+    implementation ("org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion")
+    implementation ("org.deeplearning4j:deeplearning4j-core:$dl4jVersion")
+    implementation ("org.nd4j:nd4j-native-platform:$dl4jVersion")
+    implementation ("org.slf4j:slf4j-simple:$slf4jVersion")
+    implementation ("org.slf4j:slf4j-api:$slf4jVersion")
+}
+
+/**
+ * TODO More Java examples to be converted to Kotlin.
+ */

dl4j-examples/gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists