import org.gradle.api.file.FileCollection;
import org.gradle.process.internal.JavaExecHandleBuilder;
import org.gradle.process.internal.worker.RequestHandler;
import org.gradle.process.internal.worker.SingleRequestWorkerProcessBuilder;
import org.gradle.process.internal.worker.WorkerProcessFactory;

import java.io.File;

public class AntlrWorkerManager {

        builder.setImplementationClasspath(ClasspathUtil.getClasspath(workerAction.getClass().getClassLoader()).getAsURLs());
        return builder;
    }

    @Override
    public <IN, OUT> SingleRequestWorkerProcessBuilder<IN, OUT> singleRequestWorker(Class<? extends RequestHandler<? super IN, ? extends OUT>> workerImplementation) {

import org.gradle.process.internal.worker.request.WorkerAction;

import java.io.File;
import java.util.Set;

class DefaultSingleRequestWorkerProcessBuilder<IN, OUT> implements SingleRequestWorkerProcessBuilder<IN, OUT> {
    private final Class<?> workerImplementation;
    private final DefaultWorkerProcessBuilder builder;
    private final RequestArgumentSerializers argumentSerializers = new RequestArgumentSerializers();

Class <org.gradle.process.internal.worker.SingleRequestWorkerProcessBuilder> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (SingleRequestWorkerProcessBuilder.java:0)