@Test
    public void test_errorCodeGeneration() {
        long timestamp = System.currentTimeMillis();
        String errorCode = "error_code:" + Long.toHexString(timestamp);

        assertTrue(errorCode.startsWith("error_code:"));
        assertTrue(errorCode.length() > 11); // "error_code:" is 11 chars
    }

    // Test with different exception types
    @Test
    public void test_exceptionTypes() {

        } else {
            final String errorCode = UUID.randomUUID().toString();
            message = escapeJsonKeyValue("error_code:", errorCode);
            if (logger.isDebugEnabled()) {
                logger.debug("[{}] {}", errorCode, stacktraceString.get().replace("\n", "\\n"));
            } else if (status >= 500) {
                logger.warn("[{}] {}", errorCode, t.getMessage());
            }
        }

      assertThat(expected.errorCode).isEqualTo(ErrorCode.REFUSED_STREAM)
    }
  }

  @Test
  fun recoverFromOneInternalErrorRequiresNewConnection() {
    recoverFromOneHttp2ErrorRequiresNewConnection(ErrorCode.INTERNAL_ERROR)
  }

  @Test
  fun recoverFromOneCancelRequiresNewConnection() {
    recoverFromOneHttp2ErrorRequiresNewConnection(ErrorCode.CANCEL)
  }

        super(message, cause);
        errorCode = ERROR_UNKNOWN;
    }

    /**
     * Creates a new exception with the specified message and error code.
     *
     * @param message the error message
     * @param errorCode the error code
     */
    public LlmException(final String message, final String errorCode) {
        super(message);
        this.errorCode = errorCode;
    }

    /**

   * underlying input and output streams and shuts down internal task queues.
   */
  override fun close() {
    close(ErrorCode.NO_ERROR, ErrorCode.CANCEL, null)
  }

  internal fun close(
    connectionCode: ErrorCode,
    streamCode: ErrorCode,
    cause: IOException?,
  ) {
    assertLockNotHeld()

    ignoreIoExceptions {
      shutdown(connectionCode)
    }

                    logger.warn("Failed to access Web API.", e);
                }
                message = e.getMessage();
            } else {
                final String errorCode = UUID.randomUUID().toString();
                message = "[" + errorCode + "] Failed to access to Web API.";
                if (statusCode >= 400 && statusCode < 500) {
                    if (logger.isDebugEnabled()) {

            var errorMessage = config.labels.error;
            try {
                var data = JSON.parse(e.data);
                if (data.errorCode && config.labels.errors && config.labels.errors[data.errorCode]) {
                    errorMessage = config.labels.errors[data.errorCode];
                } else if (data.message) {
                    errorMessage = data.message;
                }
            } catch (ex) {}

    when (effect) {
      is CloseStream -> {
        if (stream != null) {
          stream.close(ErrorCode.fromHttp2(effect.http2ErrorCode)!!, null)
        } else {
          socket.close()
        }
      }

      ShutdownConnection -> {
        if (stream != null) {
          stream.connection.shutdown(ErrorCode.NO_ERROR)
        } else {
          socket.close()
        }
      }

            return new ChatResult(session.getSessionId(), assistantMessage, sources);

        } catch (final LlmException e) {
            logger.warn("[RAG] LLM error during enhanced chat. sessionId={}, errorCode={}, error={}, elapsedTime={}ms",
                    session.getSessionId(), e.getErrorCode(), e.getMessage(), System.currentTimeMillis() - startTime, e);
            callback.onError("llm", e.getErrorCode());