super(message + ": " + problems.stream().map(BuilderProblem::toString).collect(Collectors.joining(", ")), null);
        this.problems = List.copyOf(problems);
    }

    public List<BuilderProblem> getProblems() {
        return problems;
    }

        return proxies.isEmpty() ? null : proxies.get(0);
    }

    @Override
    public List<Proxy> getProxies() {
        return proxies;
    }

    @Override
    public List<SettingsProblem> getProblems() {
        return problems;
    }

    public Model getModel() {
        return model;
    }

    @Override
    public ModelBuildingRequest getRequest() {
        return request;
    }

    @Override
    public ModelProblemCollector getProblems() {
        return problems;
    }

     */
    PersistedToolchains getEffectiveToolchains();

    /**
     * Return a list of problems, if any.
     *
     * @return a list of problems, never {@code null}.
     */
    List<Problem> getProblems();

                    return;
                }
                problems.add(problem);
            }
        };
    }

    @Override
    public List<Problem> getProblems() {
        return problems.build();
    }

    @Override
    public ImmutableSortedSet<Class<?>> getValidatedTypes() {
        return ImmutableSortedSet.copyOf(Comparator.comparing(Class::getName), types);
    }

/**
 * Defines events that the model builder fires during construction of the effective model. When a listener encounters
 * errors while processing the event, it can report these problems via {@link ModelBuildingEvent#getProblems()}.
 * Note: To cope with future extensions to this interface, it is strongly recommended to extend
 * {@link AbstractModelBuildingListener} rather than to directly implement this interface.
 *
 */

     *
     * @return The problems that were encountered during the decryption, can be empty but never {@code null}.
     */
    List<SettingsProblem> getProblems();

     *
     * @return the problems that were encountered during the settings building, can be empty but never {@code null}
     */
    @Nonnull
    List<BuilderProblem> getProblems();

     *
     * @return the problems that were encountered during the settings building, can be empty but never {@code null}
     */
    @Nonnull
    List<BuilderProblem> getProblems();

    private String source;

    DefaultSettingsProblemCollector(List<SettingsProblem> problems) {
        this.problems = (problems != null) ? problems : new ArrayList<>();
    }

    public List<SettingsProblem> getProblems() {
        return problems;
    }

    public void setSource(String source) {
        this.source = source;
    }

    @Override