Fix classpath roots of AOT test processing

This was regressed in 6175c42 so that
each class on the classpath was passed in as a "root". This commit
corrects this so that only the roots are passed to the AOT test
processor.

See gh-32424

Author: wilkinsona

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/plugin/SpringBootAotPlugin.java

@@ -138,7 +138,7 @@ private void configureAotTask(Project project, SourceSet sourceSet, AbstractAot
 		task.getClassesOutput().set(generatedClasses);
 		task.getGroupId().set(project.provider(() -> String.valueOf(project.getGroup())));
 		task.getArtifactId().set(project.provider(() -> project.getName()));
-		task.setInputClasses(inputSourceSet.getOutput().getClassesDirs());
+		task.setClasspathRoots(inputSourceSet.getOutput().getClassesDirs());
 	}
 
 	private void configureDependsOn(Project project, SourceSet aotSourceSet,

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/tasks/aot/AbstractAot.java

@@ -21,6 +21,7 @@
 
 import org.gradle.api.file.DirectoryProperty;
 import org.gradle.api.file.FileCollection;
+import org.gradle.api.file.FileTree;
 import org.gradle.api.provider.Property;
 import org.gradle.api.tasks.IgnoreEmptyDirectories;
 import org.gradle.api.tasks.Input;
@@ -52,7 +53,7 @@ public abstract class AbstractAot extends JavaExec {
 
 	private final Property<String> artifactId;
 
-	private FileCollection inputClasses;
+	private FileCollection classpathRoots;
 
 	protected AbstractAot() {
 		this.sourcesDir = getProject().getObjects().directoryProperty();
@@ -87,16 +88,22 @@ public final DirectoryProperty getClassesOutput() {
 		return this.classesDir;
 	}
 
+	@InputFiles
+	@PathSensitive(PathSensitivity.RELATIVE)
+	public final FileCollection getClasspathRoots() {
+		return this.classpathRoots;
+	}
+
 	@InputFiles
 	@SkipWhenEmpty
 	@IgnoreEmptyDirectories
 	@PathSensitive(PathSensitivity.RELATIVE)
-	public final FileCollection getInputClasses() {
-		return this.inputClasses.getAsFileTree();
+	final FileTree getInputClasses() {
+		return this.classpathRoots.getAsFileTree();
 	}
 
-	public void setInputClasses(FileCollection inputClasses) {
-		this.inputClasses = inputClasses;
+	public void setClasspathRoots(FileCollection classpathRoots) {
+		this.classpathRoots = classpathRoots;
 	}
 
 	List<String> processorArgs() {

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/tasks/aot/ProcessTestAot.java

@@ -69,7 +69,7 @@ FileCollection getJUnitPlatformLauncher() {
 	@TaskAction
 	public void exec() {
 		List<String> args = new ArrayList<>();
-		args.add(this.getInputClasses().getFiles().stream().filter(File::exists).map(File::getAbsolutePath)
+		args.add(this.getClasspathRoots().getFiles().stream().filter(File::exists).map(File::getAbsolutePath)
 				.collect(Collectors.joining(File.pathSeparator)));
 		args.addAll(processorArgs());
 		this.setArgs(args);