#vulnerable code 
                             @Override
	public String getActionURL(FacesContext context, String viewId) {
		String actionURL = super.getActionURL(context, viewId);
		ServletContext servletContext = getServletContext(context);
		Map<String, String> mappedResources = getMappedResources(servletContext);

		if (mappedResources.containsKey(viewId) && (extensionless || isOriginalViewExtensionless(context))) {
			// User has requested to always render extensionless, or the requested viewId was mapped and the current
			// request is extensionless; render the action URL extensionless as well.
			String pathInfo = context.getViewRoot().getViewId().equals(viewId) ? coalesce(getRequestPathInfo(context), "") : "";
			actionURL = removeExtension(servletContext, actionURL, viewId);
			return pathInfo.isEmpty() ? actionURL : (stripTrailingSlash(actionURL) + pathInfo + getQueryString(actionURL));
		}

		// Not a resource we mapped or not a forwarded one, take the version from the parent view handler.
		return actionURL;
	} 
                            #location 12 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             @Override
	public String getActionURL(FacesContext context, String viewId) {
		String actionURL = super.getActionURL(context, viewId);
		ServletContext servletContext = getServletContext(context);
		Map<String, String> mappedResources = getMappedResources(servletContext);

		if (mappedResources.containsKey(viewId) && (extensionless || isOriginalViewExtensionless(context))) {
			// User has requested to always render extensionless, or the requested viewId was mapped and the current
			// request is extensionless; render the action URL extensionless as well.
			String[] uriAndQueryString = actionURL.split("\\?", 2);
			String uri = stripWelcomeFilePrefix(servletContext, removeExtensionIfNecessary(servletContext, uriAndQueryString[0], viewId));
			String queryString = uriAndQueryString.length > 1 ? ("?" + uriAndQueryString[1]) : "";
			String pathInfo = context.getViewRoot().getViewId().equals(viewId) ? coalesce(getRequestPathInfo(context), "") : "";
			return (pathInfo.isEmpty() ? uri : (stripTrailingSlash(uri) + pathInfo)) + queryString;
		}

		// Not a resource we mapped or not a forwarded one, take the version from the parent view handler.
		return actionURL;
	}