*/
    @Nonnull
    static <P extends BuilderProblem> ProblemCollector<P> create(int maxCountLimit) {
        return create(maxCountLimit, p -> true);
    }

    /**
     * Default implementation of the ProblemCollector interface.
     *
     * @param <P> the type of problem
     */
    class Impl<P extends BuilderProblem> implements ProblemCollector<P> {

        private final int maxCountLimit;

    }

    @Test
    void testUnknownPosition() {
        ProblemCollector problemCollector = ProblemCollectorFactory.newInstance(null);
        problemCollector.setSource("SOURCE");
        problemCollector.add(Problem.Severity.ERROR, "MESSAGE", -1, -1, new Exception());
        ToolchainsBuildingException e = new ToolchainsBuildingException(problemCollector.getProblems());
        assertEquals(

 * @since 4.0.0
 */
@Experimental
public abstract class MavenBuilderException extends MavenException {

    /**
     * The collection of problems associated with this exception.
     */
    private final ProblemCollector<BuilderProblem> problems;

    /**
     * Constructs a new exception with the specified message and cause.
     * This constructor creates an empty problem collector.
     *
     * @param message the detail message

class ProblemCollectorFactoryTest {

    @Test
    void testNewInstance() {
        ProblemCollector collector1 = ProblemCollectorFactory.newInstance(null);

        Problem problem = new DefaultProblem("MESSAGE1", null, null, -1, -1, null);
        ProblemCollector collector2 = ProblemCollectorFactory.newInstance(Collections.singletonList(problem));

        assertNotSame(collector1, collector2);

import java.io.StringReader;
import java.io.StringWriter;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.apache.maven.building.Problem;
import org.apache.maven.building.ProblemCollector;
import org.apache.maven.building.ProblemCollectorFactory;
import org.apache.maven.building.Source;
import org.apache.maven.toolchain.io.ToolchainsParseException;
import org.apache.maven.toolchain.io.ToolchainsReader;

                ProblemCollector<ModelProblem> problemCollector) {
            if (problemCollector == null) {
                return null;
            }
            ArrayList<org.apache.maven.model.building.ModelProblem> problems = new ArrayList<>();
            problemCollector.problems().map(BuildSession::convert).forEach(problems::add);
            if (problemCollector.problemsOverflow()) {

     *
     * @param settings The settings to validate, must not be {@code null}.
     * @return The list of problems that were encountered, must not be {@code null}.
     */
    @Nonnull
    default ProblemCollector<BuilderProblem> validate(@Nonnull Settings settings) {
        return validate(settings, false);
    }

    /**
     * Validate the specified settings.
     *

    /**
     * Gets the problems that caused this exception.
     *
     * @return The problems that caused this exception, never {@code null}.
     */
    public ProblemCollector<ModelProblem> getProblemCollector() {
        if (result == null) {
            return ProblemCollector.empty();
        }
        return result.getProblemCollector();
    }

import org.apache.maven.api.services.ModelBuilderResult;
import org.apache.maven.api.services.ModelProblem;
import org.apache.maven.api.services.ModelSource;
import org.apache.maven.api.services.ProblemCollector;
import org.apache.maven.api.services.Source;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;

/**

     * @param e the {@link Exception}
     */
    public ToolchainsBuilderException(String message, Exception e) {
        super(message, e);
    }

    public ToolchainsBuilderException(String message, ProblemCollector<BuilderProblem> problems) {
        super(message, problems);
    }