Polish Gradle upgrade

Closes gh-26870

build.gradle

@@ -3,8 +3,8 @@ plugins {
 	id 'io.spring.nohttp' version '0.0.5.RELEASE'
 	id 'org.jetbrains.kotlin.jvm' version '1.5.30' apply false
 	id 'org.jetbrains.dokka' version '1.5.0' apply false
-	id 'org.asciidoctor.jvm.convert' version '3.1.0'
-	id 'org.asciidoctor.jvm.pdf' version '3.1.0'
+	id 'org.asciidoctor.jvm.convert' version '3.3.2'
+	id 'org.asciidoctor.jvm.pdf' version '3.3.2'
 	id 'de.undercouch.download' version '4.1.2'
 	id "io.freefair.aspectj" version '6.1.0' apply false
 	id "com.github.ben-manes.versions" version '0.39.0'
@@ -381,7 +381,10 @@ configure([rootProject] + javaProjects) { project ->
 			"https://hc.apache.org/httpcomponents-client-5.1.x/current/httpclient5/apidocs/",
 			"https://projectreactor.io/docs/test/release/api/",
 			"https://junit.org/junit4/javadoc/4.13.2/",
-			"https://junit.org/junit5/docs/5.7.2/api/"
+			"https://junit.org/junit5/docs/5.7.2/api/",
+			"https://www.reactive-streams.org/reactive-streams-1.0.3-javadoc/",
+			"https://javadoc.io/static/io.rsocket/rsocket-core/1.1.1/",
+			"https://r2dbc.io/spec/0.8.5.RELEASE/api/"
 	] as String[]
 }
 

gradle/docs-dokka.gradle

@@ -11,7 +11,7 @@ tasks.findByName("dokkaHtmlPartial")?.configure {
 				url.set(new URL("https://projectreactor.io/docs/core/release/api/"))
 			}
 			externalDocumentationLink {
-                url.set(new URL("https://www.reactive-streams.org/reactive-streams-1.0.1-javadoc/"))
+				url.set(new URL("https://www.reactive-streams.org/reactive-streams-1.0.3-javadoc/"))
 			}
 			externalDocumentationLink {
 				url.set(new URL("https://kotlin.github.io/kotlinx.coroutines/"))

gradle/docs.gradle

@@ -61,35 +61,7 @@ task api(type: Javadoc) {
 /**
  * Produce KDoc for all Spring Framework modules in "build/docs/kdoc"
  */
-/*
-moduleProjects.each { module ->
-	dokkaHtmlPartial {
-		dokkaSourceSets {
-			configureEach {
-				externalDocumentationLink {
-					url.set(URL("https://docs.spring.io/spring-framework/docs/$version/javadoc-api/"))
-					packageListUrl = new File(buildDir, "docs/javadoc/package-list").toURI().toURL()
-				}
-				externalDocumentationLink {
-					url.set(URL("https://projectreactor.io/docs/core/release/api/"))
-				}
-				externalDocumentationLink {
-					url.set(URL("https://www.reactive-streams.org/reactive-streams-1.0.1-javadoc/"))
-				}
-				/*
-			This link causes errors, removing to fix the build.
-			externalDocumentationLink {
-				url.set(URL("https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/"))
-			}
-			//
-				externalDocumentationLink {
-					url.set(URL("https://r2dbc.io/spec/0.8.3.RELEASE/api/"))
-				}
-			}
-		}
-	}
-}
-*/
+pluginManager.withPlugin("kotlin") {
 	tasks.dokkaHtmlMultiModule.configure {
 		dependsOn {
 			tasks.getByName("api")
@@ -97,6 +69,7 @@ tasks.dokkaHtmlMultiModule.configure {
 		moduleName.set("spring-framework")
 		outputDirectory.set(project.file("$buildDir/docs/kdoc"))
 	}
+}
 
 task downloadResources(type: Download) {
 	def version = "0.2.5"
@@ -195,7 +168,7 @@ task docsZip(type: Zip, dependsOn: ['api', 'asciidoctor', 'asciidoctorPdf', 'dok
 	from ("$asciidoctorPdf.outputDir") {
 		into "reference/pdf"
 	}
-	from (dokkaHtmlMultiModule) {
+	from (dokkaHtmlMultiModule.outputDirectory) {
 		into "kdoc-api"
 	}
 }
@@ -252,11 +225,11 @@ task distZip(type: Zip, dependsOn: [docsZip, schemaZip]) {
 		expand(copyright: new Date().format("yyyy"), version: project.version)
 	}
 
-	from(zipTree(docsZip.archivePath)) {
+	from(zipTree(docsZip.archiveFile)) {
 		into "${baseDir}/docs"
 	}
 
-	from(zipTree(schemaZip.archivePath)) {
+	from(zipTree(schemaZip.archiveFile)) {
 		into "${baseDir}/schema"
 	}