Upgrade to Gradle 6.3

Also switch to a different Gradle plugin for integrating the Node build
into our Gradle build.

README.md

@@ -266,7 +266,7 @@ You can also publish that artifact to your local maven repository for testing wi
 When working on the project, one can run the following command:
 
 ```
-$ ./gradlew gulp_dev
+$ ./gradlew npm_run_dev
 ```
 
 This will start a local server on `http://localhost:8080`, watch files under `src/**` and rebuild automatically.

build.gradle

@@ -1,19 +1,21 @@
 plugins {
 	id 'distribution'
 	id 'maven-publish'
-	id 'com.moowork.node' version '1.2.0'
+	id 'com.github.node-gradle.node' version '2.2.3'
-	id "com.moowork.gulp" version '1.2.0'
 }
 
 group = 'io.spring.docresources'
 description = 'Spring Documentation Resources'
 
 node {
-	version = '11.2.0'
+	version = '13.12.0'
-	npmVersion = '6.4.1'
+	npmVersion = '6.14.4'
 	download = true
 }
 
+npm_run_build.dependsOn(npm_install)
+distZip.dependsOn npm_run_build
+
 distributions {
 	main {
 		baseName = 'spring-doc-resources'
@@ -31,6 +33,3 @@ publishing {
 		}
 	}
 }
-
-gulp_default.dependsOn 'npmInstall', 'installGulp'
-distZip.dependsOn gulp_default

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -1,5 +1,21 @@
 #!/usr/bin/env sh
 
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://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.
+#
+
 ##############################################################################
 ##
 ##  Gradle start up script for UN*X
@@ -28,7 +44,7 @@ APP_NAME="Gradle"
 APP_BASE_NAME=`basename "$0"`
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS=""
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"

gradlew.bat

@@ -1,3 +1,19 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      http://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
 @if "%DEBUG%" == "" @echo off
 @rem ##########################################################################
 @rem
@@ -14,7 +30,7 @@ set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS=
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
 
 @rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome

package.json

@@ -11,5 +11,9 @@
     "gulp-connect": "^5.6.1",
     "gulp-sass": "^4.0.2",
     "node-sass": "^4.13.1"
+  },
+  "scripts": {
+    "build": "gulp",
+    "dev": "gulp dev"
   }
 }