modernize gradle and xtend

examples/states-xtext/language-server/build.gradle

@@ -1,24 +1,26 @@
 buildscript {
 	repositories {
 		mavenCentral()
+		gradlePluginPortal()
 	}
 	dependencies {
-		classpath 'org.xtext:xtext-gradle-plugin:2.0.8'
+		classpath 'org.xtext:xtext-gradle-plugin:4.0.0'
 	}
 }
 
 subprojects {
-	ext.xtextVersion = '2.26.0'
+	ext.xtextVersion = '2.34.0'
 	ext.sprottyVersion = '0.9.1'
 	ext.elkVersion = '0.8.1'
 
 	repositories {
 		mavenCentral()
 	}
 
-	apply plugin: 'java'
+	apply plugin: 'maven-publish'
+	apply plugin: 'java-library'
 	dependencies {
-		compile platform("org.eclipse.xtext:xtext-dev-bom:${xtextVersion}")
+		api platform("org.eclipse.xtext:xtext-dev-bom:${xtextVersion}")
 	}
 
 	apply plugin: 'org.xtext.xtend'
@@ -29,8 +31,10 @@ subprojects {
 	group = 'io.typefox.examples.theia.states'
 	//version = '1.0.0-SNAPSHOT'
 
-	sourceCompatibility = '11'
-	targetCompatibility = '11'
+	java {
+		sourceCompatibility = JavaVersion.VERSION_11
+		targetCompatibility = JavaVersion.VERSION_11
+	}
 
 	configurations.all {
 		exclude group: 'asm'

examples/states-xtext/language-server/gradle/maven-deployment.gradle

@@ -1,11 +1,12 @@
-//see https://docs.gradle.org/current/userguide/maven_plugin.html
-apply plugin: 'maven'
+publishing {
+    publications {
+        LocalMavenRepo(MavenPublication) {
+        }
 
-uploadArchives {
-	repositories {
-		mavenDeployer {
-			repository(url: "file://${buildDir}/localRepo")
-			snapshotRepository(url: "file://${buildDir}/localRepo")
-		}
-	}
+    }
+    repositories {
+        maven {
+            url = "$rootProject.buildDir/localRepo"
+        }
+    }
 }

examples/states-xtext/language-server/gradle/source-layout.gradle

@@ -1,13 +1,13 @@
 sourceSets {
 	main {
-		java.srcDirs = ['src/main/java', 'src/main/xtext-gen']
-		resources.srcDirs = ['src/main/resources', 'src/main/xtext-gen']
-		xtendOutputDir = 'src/main/xtend-gen'
+		java.srcDir 'src/main/xtext-gen'
+		resources.srcDir 'src/main/xtext-gen'
+		xtend.outputDir = 'src/main/xtend-gen'
 	}
 	test {
-		java.srcDirs = ['src/test/java', 'src/test/xtext-gen']
-		resources.srcDirs = ['src/test/resources', 'src/test/xtext-gen']
-		xtendOutputDir = 'src/test/xtend-gen'
+		java.srcDir 'src/test/xtext-gen'
+		resources.srcDir 'src/test/xtext-gen'
+		xtend.outputDir = 'src/test/xtend-gen'
 	}
 }
 
@@ -23,6 +23,9 @@ jar {
 	}
 }
 
+
 plugins.withId('war') {
-	webAppDirName = "src/main/webapp"
+	war {
+		webAppDirectory = file("src/main/webapp")
+	}
 }

examples/states-xtext/language-server/gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists