}

        final String errorCode = UUID.randomUUID().toString();
        if (logger.isDebugEnabled()) {
            logger.debug("[{}] {}", errorCode, stacktraceString.get().replace("\n", "\\n"));
        } else {
            logger.warn("[{}] {}", errorCode, cause.getMessage());
        }
        return "error_code:" + errorCode;
    }

        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;
    }

    /**

                public void onError(final String phase, final String errorCode) {
                    try {
                        sendSseEvent(writer, "error", Map.of("phase", phase, "message", errorCode, "errorCode", errorCode));
                        if (logger.isDebugEnabled()) {
                            logger.debug("SSE error event sent. phase={}, error={}", phase, errorCode);
                        }

        } 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());
            }
        }

    @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() {

                    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()) {

            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());

            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) {}

      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    Error:
      type: object
      properties:
        error_code:
          type: string
          example: "bd6b0bd6-0144-40bc-9567-c5751dd8eecb"
        message:
          type: string
          example: "This is an error message."