URLClassLoader shadowLoader = new URLClassLoader(getClassPathUrls(), null);
    @SuppressWarnings("unchecked")
    Class<TestEnum> shadowTestEnum =
        (Class<TestEnum>) Class.forName(TestEnum.class.getName(), false, shadowLoader);
    assertThat(shadowTestEnum).isNotEqualTo(TestEnum.class);
    // We can't write Set<TestEnum> because that is a Set of the TestEnum from the original
    // ClassLoader.

   */
  @JvmOverloads
  fun charset(defaultValue: Charset? = null): Charset? {
    val charset = parameter("charset") ?: return defaultValue
    return try {
      Charset.forName(charset)
    } catch (_: IllegalArgumentException) {
      defaultValue // This charset is invalid or unsupported. Give up.
    }
  }

  /**

       * would result in compilation failure if we directly refer to these classes.
       */
      Class<?> sharedSecrets = Class.forName(SHARED_SECRETS_CLASSNAME, false, null);
      Method langAccess = sharedSecrets.getMethod("getJavaLangAccess");
      return langAccess.invoke(null);
    } catch (ThreadDeath death) {
      throw death;

      return false;
    }
    try {
      Class.forName("com.google.appengine.api.utils.SystemProperty");
    } catch (ClassNotFoundException e) {
      return false;
    }
    try {
      // If the current environment is null, we're not inside AppEngine.
      return Class.forName("com.google.apphosting.api.ApiProxy")
              .getMethod("getCurrentEnvironment")

     * unable to do so.
     */
    static GetCheckedTypeValidator getBestValidator() {
      try {
        @SuppressWarnings("rawtypes") // class literals
        Class<? extends Enum> theClass =
            Class.forName(CLASS_VALUE_VALIDATOR_NAME).asSubclass(Enum.class);
        return (GetCheckedTypeValidator) theClass.getEnumConstants()[0];
      } catch (ClassNotFoundException
          | RuntimeException

    return myServer.serverSocket;
  }

  @SuppressWarnings("Java8ApiChecker")
  @Test
  public void testMyServerExampleWithCleaner() throws Exception {
    try {
      Class.forName("java.lang.ref.Cleaner");
    } catch (ClassNotFoundException beforeJava9) {
      return;
    }
    AtomicBoolean cleanerRan = new AtomicBoolean(false);

      // platforms in order to support Robolectric, which mixes classes from both Android and the
      // Oracle JDK. Note that we don't support HTTP/2 or other nice features on Robolectric.
      val sslContextClass = Class.forName("sun.security.ssl.SSLContextImpl")
      val context = readFieldOrNull(sslSocketFactory, sslContextClass, "context") ?: return null
      readFieldOrNull(context, X509TrustManager::class.java, "trustManager")

            } catch (final LinkageError e) {
                // drop through...
            }
        }

        try {
            // last chance - classic model
            return Class.forName(name);
        } catch (final Exception e) {
            throw new TypeNotPresentException(name, e);
        } catch (final LinkageError e) {
            throw new TypeNotPresentException(name, e);
        }
    }

      }
    }
  }

  private static final boolean ANNOTATED_TYPE_EXISTS = initAnnotatedTypeExists();

  private static boolean initAnnotatedTypeExists() {
    try {
      Class.forName("java.lang.reflect.AnnotatedType");
    } catch (ClassNotFoundException e) {
      return false;
    }
    return true;
  }

   */
  private static final class DirectLoader implements FinalizerLoader {
    @Override
    public Class<?> loadFinalizer() {
      try {
        return Class.forName(FINALIZER_CLASS_NAME);
      } catch (ClassNotFoundException e) {
        throw new AssertionError(e);
      }
    }
  }

  /** Looks up Finalizer.startFinalizer(). */