import com.google.common.collect.ImmutableList;

import javax.annotation.Nullable;
import java.util.List;

public class CompositeStackTraceClassifier implements StackTraceClassifier {

    private final List<StackTraceClassifier> classifiers;

    public CompositeStackTraceClassifier(StackTraceClassifier... classifiers) {
        this.classifiers = ImmutableList.copyOf(classifiers);
    }

    @Nullable
    @Override

import java.util.Set;

public class DefaultFailureFactory implements FailureFactory {

    public static DefaultFailureFactory withDefaultClassifier() {
        return new DefaultFailureFactory(new CompositeStackTraceClassifier(
            new InternalStackTraceClassifier(),
            StackTraceClassifier.USER_CODE
        ));
    }

    private final StackTraceClassifier stackTraceClassifier;