public void write()

in src/main/java/com/uber/cadence/converter/CustomThrowableTypeAdapter.java [62:127]
54 lines of code
10 McCabe index (conditional complexity)

  public void write(JsonWriter jsonWriter, T throwable) throws IOException {
    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw);
    StackTraceElement[] trace = throwable.getStackTrace();
    for (StackTraceElement element : trace) {
      pw.println(element);
      String fullMethodName = element.getClassName() + "." + element.getMethodName();
      if (CUTOFF_METHOD_NAMES.contains(fullMethodName)) {
        break;
      }
    }

    // We want to serialize the throwable and its cause separately, so that if the throwable
    // is serializable but the cause is not, we can still serialize them correctly (i.e. we
    // serialize the throwable correctly and convert the cause to a data converter exception).
    Throwable cause = null;
    if (throwable.getCause() != null && throwable.getCause() != throwable) {
      try {
        cause = throwable.getCause();
        Field causeField = Throwable.class.getDeclaredField("cause");
        causeField.setAccessible(true);
        causeField.set(throwable, null);
      } catch (Exception e) {
        log.warn("Failed to clear cause in original throwable.", e);
      }
    }

    JsonObject object;
    try {
      TypeAdapter exceptionTypeAdapter =
          gson.getDelegateAdapter(skipPast, TypeToken.get(throwable.getClass()));
      object = exceptionTypeAdapter.toJsonTree(throwable).getAsJsonObject();
      object.add("class", new JsonPrimitive(throwable.getClass().getName()));
      object.add("stackTrace", new JsonPrimitive(sw.toString()));
    } catch (Throwable e) {
      // In case a throwable is not serializable, we will convert it to a data converter exception.
      // The cause of the data converter exception will indicate why the serialization failed. On
      // the other hand, if the non-serializable throwable contains a cause, we will add it to the
      // suppressed exceptions list.
      DataConverterException ee =
          new DataConverterException("Failure serializing exception: " + throwable.toString(), e);
      if (cause != null) {
        ee.addSuppressed(cause);
        cause = null;
      }

      TypeAdapter<Throwable> exceptionTypeAdapter =
          new CustomThrowableTypeAdapter<>(gson, skipPast);
      object = exceptionTypeAdapter.toJsonTree(ee).getAsJsonObject();
    }

    if (cause != null) {
      TypeAdapter<Throwable> causeTypeAdapter = new CustomThrowableTypeAdapter<>(gson, skipPast);
      try {
        object.add("cause", causeTypeAdapter.toJsonTree(cause));
      } catch (Throwable e) {
        DataConverterException ee =
            new DataConverterException("Failure serializing exception: " + cause.toString(), e);
        ee.setStackTrace(cause.getStackTrace());
        object.add("cause", causeTypeAdapter.toJsonTree(ee));
      }
    }

    TypeAdapter<JsonElement> elementAdapter = gson.getAdapter(JsonElement.class);
    elementAdapter.write(jsonWriter, object);
  }