fixed error redirect on file size too large

frontend/src/main/java/de/thm/spring/controller/ApplicationController.java

@@ -121,10 +121,24 @@ public class ApplicationController implements ErrorController {
 
         @ExceptionHandler(MultipartException.class)
         String handleFileException(HttpServletRequest request, Throwable ex, Model model) {
+
+            return "redirect:/filesizetoolarge";
+        }
+    }
+
+    /**
+     * File exceptions are redirected to this method to call 'error' with in a post request with the message
+     *
+     * @param model - same as always
+     * @return the error page
+     */
+    @RequestMapping("/filesizetoolarge")
+    public String filesizetoolarge(Model model){
+
         model.addAttribute("errorMessage", "The file you tried to upload is too large. Please upload only files with a max. file size of 20 MB.");
+
         return "error";
     }
-    }
 
     @RequestMapping("/faq")
     public String faq(){

frontend/src/main/resources/templates/error.html

@@ -23,7 +23,7 @@
                 <a href="/" class="btn btn-outline-info">back</a>
 
                 <div id="error" class="bg-danger">
-                    <h4>Something went wrong</h4>
+                    <h5>Something went wrong:</h5>
                     <p th:text="${errorCode}"></p>
                     <p th:text="${errorMessage}"></p>
                 </div>