diff --git a/buildSrc/src/main/java/org/springframework/boot/build/optional/OptionalDependenciesPlugin.java b/buildSrc/src/main/java/org/springframework/boot/build/optional/OptionalDependenciesPlugin.java
index bdf909f9c9b..90f2d79bf6d 100644
--- a/buildSrc/src/main/java/org/springframework/boot/build/optional/OptionalDependenciesPlugin.java
+++ b/buildSrc/src/main/java/org/springframework/boot/build/optional/OptionalDependenciesPlugin.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -19,19 +19,15 @@ package org.springframework.boot.build.optional;
 import org.gradle.api.Plugin;
 import org.gradle.api.Project;
 import org.gradle.api.artifacts.Configuration;
-import org.gradle.api.attributes.Usage;
 import org.gradle.api.plugins.JavaPlugin;
 import org.gradle.api.plugins.JavaPluginConvention;
 import org.gradle.api.tasks.SourceSetContainer;
-import org.gradle.api.tasks.javadoc.Javadoc;
-import org.gradle.plugins.ide.eclipse.EclipsePlugin;
-import org.gradle.plugins.ide.eclipse.model.EclipseModel;
 
 /**
  * A {@code Plugin} that adds support for Maven-style optional dependencies. Creates a new
  * {@code optional} configuration. The {@code optional} configuration is part of the
- * project's compile and runtime classpath's but does not affect the classpath of
- * dependent projects.
+ * project's compile and runtime classpaths but does not affect the classpath of dependent
+ * projects.
  *
  * @author Andy Wilkinson
  */
@@ -44,22 +40,19 @@ public class OptionalDependenciesPlugin implements Plugin<Project> {
 
 	@Override
 	public void apply(Project project) {
-		Configuration optional = project.getConfigurations().create(OPTIONAL_CONFIGURATION_NAME);
-		optional.attributes((attributes) -> attributes.attribute(Usage.USAGE_ATTRIBUTE,
-				project.getObjects().named(Usage.class, Usage.JAVA_RUNTIME)));
+		Configuration optional = project.getConfigurations().create("optional");
+		optional.setCanBeConsumed(false);
+		optional.setCanBeResolved(false);
 		project.getPlugins().withType(JavaPlugin.class, (javaPlugin) -> {
 			SourceSetContainer sourceSets = project.getConvention().getPlugin(JavaPluginConvention.class)
 					.getSourceSets();
 			sourceSets.all((sourceSet) -> {
-				sourceSet.setCompileClasspath(sourceSet.getCompileClasspath().plus(optional));
-				sourceSet.setRuntimeClasspath(sourceSet.getRuntimeClasspath().plus(optional));
+				project.getConfigurations().getByName(sourceSet.getCompileClasspathConfigurationName())
+						.extendsFrom(optional);
+				project.getConfigurations().getByName(sourceSet.getRuntimeClasspathConfigurationName())
+						.extendsFrom(optional);
 			});
-			project.getTasks().withType(Javadoc.class)
-					.all((javadoc) -> javadoc.setClasspath(javadoc.getClasspath().plus(optional)));
 		});
-		project.getPlugins().withType(EclipsePlugin.class,
-				(eclipsePlugin) -> project.getExtensions().getByType(EclipseModel.class)
-						.classpath((classpath) -> classpath.getPlusConfigurations().add(optional)));
 	}
 
 }
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-gradle-test-support/src/main/java/org/springframework/boot/testsupport/gradle/testkit/GradleBuild.java b/spring-boot-project/spring-boot-tools/spring-boot-gradle-test-support/src/main/java/org/springframework/boot/testsupport/gradle/testkit/GradleBuild.java
index 19a1e2fbd09..c80c0806139 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-gradle-test-support/src/main/java/org/springframework/boot/testsupport/gradle/testkit/GradleBuild.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-gradle-test-support/src/main/java/org/springframework/boot/testsupport/gradle/testkit/GradleBuild.java
@@ -44,9 +44,6 @@ import org.apache.http.conn.HttpClientConnectionManager;
 import org.gradle.testkit.runner.BuildResult;
 import org.gradle.testkit.runner.GradleRunner;
 import org.gradle.util.GradleVersion;
-import org.jetbrains.kotlin.cli.common.PropertiesKt;
-import org.jetbrains.kotlin.compilerRunner.KotlinLogger;
-import org.jetbrains.kotlin.daemon.client.KotlinCompilerClient;
 import org.jetbrains.kotlin.gradle.model.KotlinProject;
 import org.jetbrains.kotlin.gradle.plugin.KotlinCompilerPluginSupportPlugin;
 import org.jetbrains.kotlin.gradle.plugin.KotlinPlugin;
@@ -113,9 +110,10 @@ public class GradleBuild {
 				new File("build/resources/main"), new File(pathOfJarContaining(LaunchScript.class)),
 				new File(pathOfJarContaining(ClassVisitor.class)),
 				new File(pathOfJarContaining(DependencyManagementPlugin.class)),
-				new File(pathOfJarContaining(PropertiesKt.class)), new File(pathOfJarContaining(KotlinLogger.class)),
+				new File(pathOfJarContaining("org.jetbrains.kotlin.cli.common.PropertiesKt")),
+				new File(pathOfJarContaining("org.jetbrains.kotlin.compilerRunner.KotlinLogger")),
 				new File(pathOfJarContaining(KotlinPlugin.class)), new File(pathOfJarContaining(KotlinProject.class)),
-				new File(pathOfJarContaining(KotlinCompilerClient.class)),
+				new File(pathOfJarContaining("org.jetbrains.kotlin.daemon.client.KotlinCompilerClient")),
 				new File(pathOfJarContaining(KotlinCompilerPluginSupportPlugin.class)),
 				new File(pathOfJarContaining(LanguageSettings.class)),
 				new File(pathOfJarContaining(ArchiveEntry.class)), new File(pathOfJarContaining(BuildRequest.class)),
@@ -127,6 +125,15 @@ public class GradleBuild {
 				new File(pathOfJarContaining(Toml.class)), new File(pathOfJarContaining(Lexer.class)));
 	}
 
+	private String pathOfJarContaining(String className) {
+		try {
+			return pathOfJarContaining(Class.forName(className));
+		}
+		catch (ClassNotFoundException ex) {
+			throw new IllegalArgumentException(ex);
+		}
+	}
+
 	private String pathOfJarContaining(Class<?> type) {
 		return type.getProtectionDomain().getCodeSource().getLocation().getPath();
 	}