assertTrue(HostSpecifier.isValid(spec));
  }

  private void assertBad(String spec) {
    try {
      HostSpecifier.fromValid(spec);
      fail("Should have thrown IllegalArgumentException: " + spec);
    } catch (IllegalArgumentException expected) {
    }

    try {
      HostSpecifier.from(spec);
      fail("Should have thrown ParseException: " + spec);
    } catch (ParseException expected) {

        collection.containsAll(MinimalCollection.of(e3())));
  }

  @CollectionFeature.Require(absent = ALLOWS_NULL_QUERIES)
  public void testContainsAll_nullNotAllowed() {
    try {
      assertFalse(collection.containsAll(MinimalCollection.of((E) null)));
    } catch (NullPointerException tolerated) {
    }
  }

  @CollectionFeature.Require(ALLOWS_NULL_QUERIES)

   */
  @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.
    }
  }

  /**

Configure and install casdoor server by following [Casdoor Server Installation](https://casdoor.org/docs/basic/server-installation).
For a quick installation, docker-compose reference configs are also available on the [Casdoor Try with Docker](https://casdoor.org/docs/basic/try-with-docker).

### Configure Casdoor

- Go to Applications
  - Create or use an existing Casdoor application
  - Edit the application
    - Copy `Client ID` and `Client secret`

        oldProps.putAll(System.getProperties());
        ClassLoader oldCL = Thread.currentThread().getContextClassLoader();
        try (C context = createContext(invokerRequest)) {
            if (contextConsumer != null) {
                contextConsumer.accept(context);
            }
            try {
                if (context.containerCapsule != null

        }

        if (pomFile == null) {
            Artifact pomArtifact = new DefaultArtifact(groupId, artifactId, "", "pom", version);

            try {
                ArtifactRequest request = new ArtifactRequest(pomArtifact, repositories, context);
                request.setTrace(trace);
                pomArtifact = resolver.resolveArtifact(session, request).getArtifact();

   *
   * @throws IOException if an I/O error while writing to this sink
   */
  public void write(CharSequence charSequence) throws IOException {
    checkNotNull(charSequence);

    try (Writer out = openStream()) {
      out.append(charSequence);
    }
  }

  /**
   * Writes the given lines of text to this sink with each line (including the last) terminated with

    assertDone(future);
    assertThat(future.isCancelled()).isFalse();

    try {
      getDone(future);
      fail();
    } catch (ExecutionException e) {
      assertThat(e).hasCauseThat().isSameInstanceAs(expectedException);
    }

    try {
      getDoneFromTimeoutOverload(future);
      fail();
    } catch (ExecutionException e) {

      @Override public void onFailure(Call call, IOException e) {
        e.printStackTrace();
      }

      @Override public void onResponse(Call call, Response response) throws IOException {
        try (ResponseBody responseBody = response.body()) {
          if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

          Headers responseHeaders = response.headers();

  public void run() throws Exception {
    Request request = new Request.Builder()
        .url("https://api.github.com/gists/c2a7c39532239ff261be")
        .build();
    try (Response response = client.newCall(request).execute()) {
      if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

      Gist gist = gistJsonAdapter.fromJson(response.body().source());