Adopt new Gradle maven-publish plugin

The maven plugin was removed in Gradle 7, so we need to replace it with
maven-publish. This uses a similar DSL, but operates in a slightly
different way. The simplest way of handling the differences is to
reorder its application within build.gradle so that appropriate
properties will have been applied by the time publish-maven.gradle
is invoked.

build.gradle

@@ -99,30 +99,6 @@ allprojects {
 
 }
 
-subprojects { subproject ->
-
-	apply from: "${rootProject.projectDir}/publish-maven.gradle"
-
-	sourceCompatibility=1.8
-	targetCompatibility=1.8
-
-	[compileJava, compileTestJava]*.options*.compilerArgs = ["-Xlint:none"]
-
-	sourceSets.test.resources.srcDirs = ["src/main/java", "src/test/resources", "src/test/java"]
-
-	jar {
-		manifest.attributes["Implementation-Title"] = subproject.name
-		manifest.attributes["Implementation-Version"] = subproject.version
-
-		from("${rootProject.projectDir}/src/dist") {
-			include "license.txt"
-			include "notice.txt"
-			into "META-INF"
-			expand(copyright: new Date().format("yyyy"), version: project.version)
-		}
-	}
-}
-
 configure(javaProjects) { javaProject ->
 
 	test {
@@ -154,6 +130,30 @@ configure(javaProjects) { javaProject ->
 	}
 }
 
+subprojects { subproject ->
+
+	apply from: "${rootProject.projectDir}/publish-maven.gradle"
+
+	sourceCompatibility=1.8
+	targetCompatibility=1.8
+
+	[compileJava, compileTestJava]*.options*.compilerArgs = ["-Xlint:none"]
+
+	sourceSets.test.resources.srcDirs = ["src/main/java", "src/test/resources", "src/test/java"]
+
+	jar {
+		manifest.attributes["Implementation-Title"] = subproject.name
+		manifest.attributes["Implementation-Version"] = subproject.version
+
+		from("${rootProject.projectDir}/src/dist") {
+			include "license.txt"
+			include "notice.txt"
+			into "META-INF"
+			expand(copyright: new Date().format("yyyy"), version: project.version)
+		}
+	}
+}
+
 configure(rootProject) {
 	description = "Spring Web Flow"
 

publish-maven.gradle

@@ -1,27 +1,26 @@
-apply plugin: "maven"
+apply plugin: "maven-publish"
 
-install {
+publishing {
-	repositories.mavenInstaller {
+  publications {
-		customizePom(pom, project)
+    mavenJava(MavenPublication) {
+      from components.java
+      if (project.name != 'spring-js-resources') {
+        artifact sourcesJar
+        artifact javadocJar
+      }
+      versionMapping {
+        usage('java-api') {
+          fromResolutionOf('runtimeClasspath')
+        }
+        usage('java-runtime') {
+          fromResolutionResult()
         }
       }
-
+      pom {
-def customizePom(pom, gradleProject) {
+        afterEvaluate {
-	pom.whenConfigured { generatedPom ->
+          description = project.description
-		// eliminate test-scoped dependencies (no need in maven central poms)
+          name = project.description
-		generatedPom.dependencies.removeAll { dep ->
-			dep.scope == "test"
         }
-
-		// sort to make pom dependencies order consistent to ease comparison of older poms
-		generatedPom.dependencies = generatedPom.dependencies.sort { dep ->
-			"$dep.scope:$dep.groupId:$dep.artifactId"
-		}
-
-		// add all items necessary for maven central publication
-		generatedPom.project {
-			name = gradleProject.description
-			description = gradleProject.description
         url = "https://github.com/spring-projects/spring-webflow"
         organization {
           name = "Spring IO"
@@ -29,9 +28,9 @@ def customizePom(pom, gradleProject) {
         }
         licenses {
           license {
-					name "The Apache Software License, Version 2.0"
+            name = "The Apache Software License, Version 2.0"
-					url "https://www.apache.org/licenses/LICENSE-2.0.txt"
+            url = "https://www.apache.org/licenses/LICENSE-2.0.txt"
-					distribution "repo"
+            distribution = "repo"
           }
         }
         scm {
@@ -53,3 +52,10 @@ def customizePom(pom, gradleProject) {
       }
     }
   }
+}
+
+// Disable generation of Gradle Module Metadata for compatibility
+// with older versions of Spring Web Flow.
+tasks.withType(GenerateModuleMetadata) {
+  enabled = false
+}