import org.gradle.api.Incubating;

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

/**
 * ProblemEvent with all the details relevant.
 *
 * @since 8.8
 */
@Incubating
public interface SingleProblemEvent extends ProblemEvent {

    /**
     * Returns the problem definition.
     *
     * @return the definition
     * @since 8.9
     */
    ProblemDefinition getDefinition();

    /**

        problems[0].failure.failure == null
    }

    class ProblemProgressListener implements ProgressListener {

        List<SingleProblemEvent> problems = []

        @Override
        void statusChanged(ProgressEvent event) {
            if (event instanceof SingleProblemEvent) {
                this.problems.add(event)
            }
        }
    }

import org.gradle.tooling.events.problems.ProblemDefinition;
import org.gradle.tooling.events.problems.SingleProblemEvent;
import org.gradle.tooling.events.problems.Solution;

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

@NonNullApi
public class DefaultSingleProblemEvent extends BaseProgressEvent implements SingleProblemEvent {
    private final ProblemDefinition problemDefinition;
    private final ContextualLabel contextualLabel;

import org.gradle.integtests.tooling.fixture.ToolingApiSpecification
import org.gradle.integtests.tooling.fixture.ToolingApiVersion
import org.gradle.integtests.tooling.r85.CustomModel
import org.gradle.tooling.events.problems.SingleProblemEvent
import org.junit.Assume

import static org.gradle.integtests.fixtures.AvailableJavaHomes.getJdk17
import static org.gradle.integtests.fixtures.AvailableJavaHomes.getJdk21