Stop using ConfigureUtil in BomExtension

While we're building with Gradle 6.9 at the moment and ConfigureUtil
has only been deprecated in Gradle 7.1, it doesn't do any harm to
stop using it now.

Closes gh-26928

buildSrc/src/main/java/org/springframework/boot/build/bom/BomExtension.java

@@ -47,11 +47,11 @@ import org.gradle.api.Project;
 import org.gradle.api.Task;
 import org.gradle.api.artifacts.Configuration;
 import org.gradle.api.artifacts.dsl.DependencyHandler;
+import org.gradle.api.model.ObjectFactory;
 import org.gradle.api.plugins.JavaPlatformPlugin;
 import org.gradle.api.publish.maven.tasks.GenerateMavenPom;
 import org.gradle.api.tasks.Sync;
 import org.gradle.api.tasks.TaskExecutionException;
-import org.gradle.util.ConfigureUtil;
 import org.w3c.dom.Document;
 import org.w3c.dom.NodeList;
 
@@ -77,7 +77,7 @@ public class BomExtension {
 
 	private final List<Library> libraries = new ArrayList<>();
 
-	private final UpgradeHandler upgradeHandler = new UpgradeHandler();
+	private final UpgradeHandler upgradeHandler;
 
 	private final DependencyHandler dependencyHandler;
 
@@ -85,6 +85,7 @@ public class BomExtension {
 
 	public BomExtension(DependencyHandler dependencyHandler, Project project) {
 		this.dependencyHandler = dependencyHandler;
+		this.upgradeHandler = project.getObjects().newInstance(UpgradeHandler.class);
 		this.project = project;
 	}
 
@@ -92,8 +93,8 @@ public class BomExtension {
 		return this.libraries;
 	}
 
-	public void upgrade(Closure<?> closure) {
-		ConfigureUtil.configure(closure, this.upgradeHandler);
+	public void upgrade(Action<UpgradeHandler> action) {
+		action.execute(this.upgradeHandler);
 	}
 
 	public Upgrade getUpgrade() {
@@ -101,9 +102,10 @@ public class BomExtension {
 				this.upgradeHandler.gitHub.repository, this.upgradeHandler.gitHub.issueLabels));
 	}
 
-	public void library(String name, String version, Closure<?> closure) {
-		LibraryHandler libraryHandler = new LibraryHandler();
-		ConfigureUtil.configure(closure, libraryHandler);
+	public void library(String name, String version, Action<LibraryHandler> action) {
+		ObjectFactory objects = this.project.getObjects();
+		LibraryHandler libraryHandler = objects.newInstance(LibraryHandler.class);
+		action.execute(libraryHandler);
 		addLibrary(new Library(name, DependencyVersion.parse(version), libraryHandler.groups,
 				libraryHandler.prohibitedVersions));
 	}
@@ -196,16 +198,16 @@ public class BomExtension {
 
 		private final List<ProhibitedVersion> prohibitedVersions = new ArrayList<>();
 
-		public void group(String id, Closure<?> closure) {
+		public void group(String id, Action<GroupHandler> action) {
 			GroupHandler groupHandler = new GroupHandler(id);
-			ConfigureUtil.configure(closure, groupHandler);
+			action.execute(groupHandler);
 			this.groups
 					.add(new Group(groupHandler.id, groupHandler.modules, groupHandler.plugins, groupHandler.imports));
 		}
 
-		public void prohibit(String range, Closure<?> closure) {
+		public void prohibit(String range, Action<ProhibitedVersionHandler> action) {
 			ProhibitedVersionHandler prohibitedVersionHandler = new ProhibitedVersionHandler();
-			ConfigureUtil.configure(closure, prohibitedVersionHandler);
+			action.execute(prohibitedVersionHandler);
 			try {
 				this.prohibitedVersions.add(new ProhibitedVersion(VersionRange.createFromVersionSpec(range),
 						prohibitedVersionHandler.reason));
@@ -258,7 +260,10 @@ public class BomExtension {
 					Object arg = ((Object[]) args)[0];
 					if (arg instanceof Closure) {
 						ExclusionHandler exclusionHandler = new ExclusionHandler();
-						ConfigureUtil.configure((Closure<?>) arg, exclusionHandler);
+						Closure<?> closure = (Closure<?>) arg;
+						closure.setResolveStrategy(Closure.DELEGATE_FIRST);
+						closure.setDelegate(exclusionHandler);
+						closure.call(exclusionHandler);
 						return new Module(name, exclusionHandler.exclusions);
 					}
 				}
@@ -289,8 +294,8 @@ public class BomExtension {
 			this.upgradePolicy = upgradePolicy;
 		}
 
-		public void gitHub(Closure<?> closure) {
-			ConfigureUtil.configure(closure, this.gitHub);
+		public void gitHub(Action<GitHubHandler> action) {
+			action.execute(this.gitHub);
 		}
 
 	}