* from source file to class file.
 */
@NonNullApi
public class CompilationSourceDirs {
    private static final Logger LOG = LoggerFactory.getLogger(CompilationSourceDirs.class);
    private final List<File> sourceRoots;

    public CompilationSourceDirs(JavaCompileSpec spec) {
        this.sourceRoots = new ArrayList<>(spec.getSourceRoots());

        private final CompilationSourceDirs compilationSourceDirs;
        private final ApiCompilerResult result;
        private final CompilationClassBackupService compilationClassBackupService;

        private TrackingClassGenerationCompilationCustomizer(CompilationSourceDirs compilationSourceDirs, ApiCompilerResult result, CompilationClassBackupService compilationClassBackupService) {

    def compilationSourceDirs = new CompilationSourceDirs(["src/main/java", "src/main/java2"].collect { temp.file(it) })

    def "relativizes source paths"() {
        expect:
        compilationSourceDirs.relativize(temp.file("src/main/java/Foo.java")) == Optional.of("Foo.java")

                                                            ConstantsAnalysisResult constantsAnalysisResult, CompilationSourceDirs compilationSourceDirs,
                                                            CompilationClassBackupService classBackupService
        ) {
            ensureCompilerTask();

        JavaCompiler.CompilationTask task,
        Map<String, Set<String>> sourceToClassMapping,
        ConstantsAnalysisResult constantsAnalysisResult,
        CompilationSourceDirs compilationSourceDirs,
        CompilationClassBackupService classBackupService
    );

import org.gradle.api.Project;
import org.gradle.api.Task;
import org.gradle.api.internal.file.FileTreeInternal;
import org.gradle.api.internal.tasks.JvmConstants;
import org.gradle.api.internal.tasks.compile.CompilationSourceDirs;
import org.gradle.api.tasks.compile.JavaCompile;
import org.gradle.internal.jvm.JavaModuleDetector;

import java.io.File;
import java.util.List;

@NonNullApi
public class EclipseClassPathUtil {

import org.gradle.api.internal.tasks.compile.CleaningJavaCompiler;
import org.gradle.api.internal.tasks.compile.CommandLineJavaCompileSpec;
import org.gradle.api.internal.tasks.compile.CompilationSourceDirs;
import org.gradle.api.internal.tasks.compile.CompileJavaBuildOperationReportingCompiler;
import org.gradle.api.internal.tasks.compile.CompilerForkUtils;
import org.gradle.api.internal.tasks.compile.DefaultJavaCompileSpec;

import org.gradle.api.file.FileCollection;
import org.gradle.api.file.FileTree;
import org.gradle.api.file.ProjectLayout;
import org.gradle.api.internal.file.FileTreeInternal;
import org.gradle.api.internal.tasks.compile.CompilationSourceDirs;
import org.gradle.api.jvm.ModularitySpec;
import org.gradle.api.model.ObjectFactory;
import org.gradle.api.provider.Property;
import org.gradle.api.provider.Provider;
import org.gradle.api.provider.ProviderFactory;

import org.gradle.api.internal.tasks.compile.CleaningJavaCompiler;
import org.gradle.api.internal.tasks.compile.CommandLineJavaCompileSpec;
import org.gradle.api.internal.tasks.compile.CompilationSourceDirs;
import org.gradle.api.internal.tasks.compile.CompilerForkUtils;
import org.gradle.api.internal.tasks.compile.DefaultGroovyJavaJointCompileSpec;

                task,
                result.getSourceClassesMapping(),
                result.getConstantsAnalysisResult(),
                new CompilationSourceDirs(spec),
                new CompilationClassBackupService(spec, result)
            );
        }
        Set<AnnotationProcessorDeclaration> annotationProcessors = spec.getEffectiveAnnotationProcessors();