*
     * @return The hint about the source of the problem or an empty string if unknown, never {@code null}.
     */
    String getSource();

    /**
     * Gets the one-based index of the line containing the problem. The line number should refer to some text file that
     * is given by {@link #getSource()}.
     *
     * @return The one-based index of the line containing the problem or a non-positive value if unknown.
     */

        assertEquals("", problem.getSource());

        problem = new DefaultProblem(null, null, "", -1, -1, null);
        assertEquals("", problem.getSource());

        problem = new DefaultProblem(null, null, "SOURCE", -1, -1, null);
        assertEquals("SOURCE", problem.getSource());
    }

    @Test
    void testGetLocation() {

import javax.inject.Inject

@CacheableTask
abstract class Docbook2Xhtml extends SourceTask {
    @Override
    @PathSensitive(PathSensitivity.RELATIVE)
    FileTree getSource() {
        return super.getSource()
    }

    @PathSensitive(PathSensitivity.RELATIVE)
    @InputDirectory
    abstract DirectoryProperty getStylesheetDirectory();

    @PathSensitive(PathSensitivity.RELATIVE)
    @InputFiles

	opsID   string
}

// Lock - block until write lock is taken or timeout has occurred.
func (di *distLockInstance) GetLock(ctx context.Context, timeout *dynamicTimeout) (LockContext, error) {
	lockSource := getSource(2)
	start := UTCNow()

	newCtx, cancel := context.WithCancel(ctx)
	if !di.rwMutex.GetLock(newCtx, cancel, di.opsID, lockSource, dsync.Options{
		Timeout:       timeout.Timeout(),

        Object value = (options != null) ? options.get(IS_STRICT) : null;
        return value == null || Boolean.parseBoolean(value.toString());
    }

    private InputSource getSource(Map<String, ?> options) {
        Object value = (options != null) ? options.get(INPUT_SOURCE) : null;
        return (InputSource) value;
    }

    private Path getRootDirectory(Map<String, ?> options) {

        assertThrows(
            ConflictingRequirementsException.class, () -> buildTesterRequirements(Tester.class));
    assertThat(e.getConflicts()).containsExactly(FOO);
    assertThat(e.getSource()).isEqualTo(Tester.class.getAnnotation(Require.class));
  }

  public void testBuildTesterRequirements_classClassConflict_inherited() {
    @Require(FOO)
    abstract class BaseTester {}
    @Require(absent = FOO)

 */
@Experimental
@Immutable
public interface ProjectBuilderRequest {

    @Nonnull
    Session getSession();

    @Nonnull
    Optional<Path> getPath();

    @Nonnull
    Optional<Source> getSource();

    boolean isAllowStubModel();

    boolean isRecursive();

    boolean isProcessPlugins();

    @Nullable
    List<RemoteRepository> getRepositories();

    @Nonnull

        Profile existing = profilesById.get(profileId);
        if (existing != null) {
            logger.warn("Overriding profile: '" + profileId + "' (source: " + existing.getSource()
                    + ") with new instance from source: " + profile.getSource());
        }

        profilesById.put(profile.getId(), profile);

        Activation activation = profile.getActivation();

         */
        REQUEST_DOMINANT,
    }

    @Nonnull
    Session getSession();

    @Nonnull
    ModelSource getSource();

    @Nonnull
    RequestType getRequestType();

    boolean isLocationTracking();

    boolean isRecursive();

    /**
     * Defines external profiles that may be activated for the given model.

    super(message);
    this.conflicts = conflicts;
    this.source = source;
  }

  public Set<Feature<?>> getConflicts() {
    return conflicts;
  }

  public Object getSource() {
    return source;
  }

  @Override
  public String getMessage() {
    return super.getMessage() + " (source: " + source + ")";
  }

  private static final long serialVersionUID = 0;