When developers use FreeMarker templates for HTML content in emails, they frequently run into rendering problems in different clients, such as Microsoft Outlook. Despite being appropriately substituted in the template, the dynamic content may appear as unformatted HTML and CSS code rather than a properly formatted email.

Effectively managing authentication problems is essential for any online application that makes use of Thymeleaf and Spring Security. The user experience can be greatly impacted by the problem of not displaying error messages and not remembering user input on authentication failure. Through the use of RedirectAttributes provided by Spring MVC and appropriate security configuration, developers may improve the usability and resilience of their login processes.