t.printStackTrace(pw);
            pw.flush();
            return systemHelper.abbreviateLongText(sw.toString());
        } catch (final IOException e) {
            logger.warn("Failed to print the stack trace {}", t.getMessage(), e);
        }
        return StringUtil.EMPTY;
    }

    }

    public void test_print() {
        activityHelper.useEcsFormat = false;
        activityHelper.print("aaa", OptionalThing.empty(), Map.of());
        assertEquals("action:AAA\tuser:-", localLogMsg.get());

        activityHelper.print("aaa bbb", createUser("testuser", new String[0]), Map.of("111", "222"));

            builder.flush();
            return builder.getOutputStream();
        } catch (final IOException e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to print the output.", e);
            }
            return new ByteArrayOutputStream();
        }
    }

    public static OutputStream getXContentOutputStream(final ToXContent xContent, final MediaType mediaType) {

        response.setContentType(buf.toString());
        writeHeaders(response);
        try (PrintWriter out = new PrintWriter(new OutputStreamWriter(response.getOutputStream(), enc))) {
            out.print(text);
        } catch (final IOException e) {
            throw new IORuntimeException(e);
        }
    }

    protected abstract void writeHeaders(final HttpServletResponse response);

                        .filter(StringUtil::isNotBlank).orElse("-"));
        log(valueMap);
    }

    public void print(final String action, final OptionalThing<FessUserBean> user, final Map<String, String> params) {
        final Map<String, String> valueMap = new LinkedHashMap<>();

    public static final String ERRORS_unauthorized_request = "{errors.unauthorized_request}";

    /** The key of the message: Failed to print thread dump. */
    public static final String ERRORS_failed_to_print_thread_dump = "{errors.failed_to_print_thread_dump}";

    /** The key of the message: {0} is not supported. */
    public static final String ERRORS_file_is_not_supported = "{errors.file_is_not_supported}";

                    }
                }
                buf.append('}');
                buf.append('\n');
                try {
                    response.getWriter().print(buf.toString());
                } catch (final IOException e) {
                    throw new IORuntimeException(e);
                }
                return true;
            }, OptionalThing.empty());

                saveInfo(messages -> messages.addSuccessPrintThreadDump(GLOBAL));
            } catch (final Exception e) {
                logger.warn("Failed to print a thread dump.", e);
                throwValidationError(messages -> messages.addErrorsFailedToPrintThreadDump(GLOBAL), this::asListHtml);
            }
        }).orElse(() -> {