public CharSource asCharSource(Charset charset) {
      checkNotNull(charset);
      return CharSource.empty();
    }

    @Override
    public byte[] read() {
      return bytes; // length is 0, no need to clone
    }

    @Override
    public String toString() {
      return "ByteSource.empty()";
    }
  }

  private static final class ConcatenatedByteSource extends ByteSource {

  // Graph query methods

  /**
   * Returns true if {@code graph} has at least one cycle. A cycle is defined as a non-empty subset
   * of edges in a graph arranged to form a path (a sequence of adjacent outgoing edges) starting
   * and ending with the same node.
   *
   * <p>This method will detect any non-empty cycle, including self-loops (a cycle of length 1).
   */
  public static <N> boolean hasCycle(Graph<N> graph) {

  // Graph query methods

  /**
   * Returns true if {@code graph} has at least one cycle. A cycle is defined as a non-empty subset
   * of edges in a graph arranged to form a path (a sequence of adjacent outgoing edges) starting
   * and ending with the same node.
   *
   * <p>This method will detect any non-empty cycle, including self-loops (a cycle of length 1).
   */
  public static <N> boolean hasCycle(Graph<N> graph) {

    }

    public FessUser getFessUser() {
        return user;
    }

    public static FessUserBean empty() {
        return new FessUserBean(null) {
            private static final long serialVersionUID = 1L;

            @Override
            public String getUserId() {
                return Constants.EMPTY_USER_ID;

import org.apache.maven.model.Plugin;
import org.apache.maven.model.PluginExecution;
import org.apache.maven.plugin.MojoExecution;

/**
 * A stub implementation that assumes an empty lifecycle to bypass interaction with the plugin manager and to avoid
 * plugin artifact resolution from repositories.
 *
 */
@Deprecated
public class EmptyLifecycleExecutor implements LifecycleExecutor {

    @Override

import jakarta.validation.constraints.Size;

/**
 * The create form for Web Authentication.
 */
public class CreateForm {

    /**
     * Default constructor.
     */
    public CreateForm() {
        // Empty constructor
    }

    /**
     * The CRUD mode for the form.
     */
    @ValidateTypeFailure
    public Integer crudMode;

    /**
     * The hostname for the web authentication.
     */

     * {@link jcifs.Configuration#getNotifyBufferSize()}).
     * If the server cannot fulfill the request because the changes did not fit the buffer
     * it will return an empty list of changes.
     *
     * @return changes since the last invocation
     * @throws CIFSException if an error occurs retrieving file notifications
     */
    List<FileNotifyInformation> watch() throws CIFSException;

     * Specifies the types that should be considered for dependency injection.
     * <p>
     * When specified, only the listed types will be available for injection,
     * even if the class implements or extends other types. If empty, the
     * default behavior is to make all supertypes available for injection.
     * <p>
     * Example:
     * <pre>
     * {@literal @}Typed({Service.class, Monitored.class})

 */
@GwtIncompatible // not worth using in GWT for now
class CompactHashSet<E extends @Nullable Object> extends AbstractSet<E> implements Serializable {
  // TODO(user): cache all field accesses in local vars

  /** Creates an empty {@code CompactHashSet} instance. */
  public static <E extends @Nullable Object> CompactHashSet<E> create() {
    return new CompactHashSet<>();
  }

  /**

            assertEquals("nonexistent is not found.", e.getMessage());
        }
    }

    // Test getScriptEngine with empty string
    public void test_getScriptEngine_emptyString() {
        try {
            scriptEngineFactory.getScriptEngine("");
            fail("Should throw ScriptEngineException for empty string");
        } catch (ScriptEngineException e) {
            assertEquals(" is not found.", e.getMessage());
        }