public void handleError()

in src/main/java/org/apache/sling/servlets/resolver/internal/SlingServletResolver.java [339:398]
45 lines of code
6 McCabe index (conditional complexity)

    public void handleError(
            final Throwable throwable,
            final SlingJakartaHttpServletRequest request,
            final SlingJakartaHttpServletResponse response)
            throws IOException {
        // do not handle, if already handling ....
        if (request.getAttribute(RequestDispatcher.ERROR_REQUEST_URI) != null) {
            LOGGER.error("handleError: Recursive invocation. Not further handling Throwable:", throwable);
            return;
        }

        // start tracker
        RequestProgressTracker progressTracker = request.getRequestProgressTracker();
        String timerName = "handleError:throwable=" + throwable.getClass().getName();
        progressTracker.startTimer(timerName);

        final ResourceResolver scriptResolver = this.getScriptResourceResolver();
        try {
            // find the error handler component
            Servlet servlet = null;
            Resource resource = getErrorResource(request);

            Class<?> tClass = throwable.getClass();
            while (servlet == null && tClass != Object.class) {
                // find a servlet for the simple class name as the method name
                String extension = request.getRequestPathInfo().getExtension();
                ResourceCollector locationUtil = new ResourceCollector(
                        tClass.getSimpleName(),
                        DEFAULT_ERROR_HANDLER_RESOURCE_TYPE,
                        resource,
                        extension,
                        this.executionPaths.get(),
                        this.useResourceCaching);
                servlet = getServletInternal(locationUtil, request, scriptResolver);

                // go to the base class
                tClass = tClass.getSuperclass();
            }

            if (servlet == null) {
                servlet = getDefaultErrorServlet(request, resource, scriptResolver);
            }

            // set the message properties
            request.setAttribute(RequestDispatcher.ERROR_EXCEPTION, throwable);
            request.setAttribute(RequestDispatcher.ERROR_EXCEPTION_TYPE, throwable.getClass());
            request.setAttribute(RequestDispatcher.ERROR_MESSAGE, throwable.getMessage());
            request.setAttribute(RequestDispatcher.ERROR_METHOD, request.getMethod());
            if (request.getQueryString() != null) {
                request.setAttribute(RequestDispatcher.ERROR_QUERY_STRING, request.getQueryString());
            }

            // log a track entry after resolution before calling the handler
            progressTracker.logTimer(timerName, "Using handler {0}", RequestUtil.getServletName(servlet));

            handleError(servlet, request, response);
        } finally {
            progressTracker.logTimer(timerName, "Error handler finished");
        }
    }