remove whitelabel error and handle error when uri=/tokens

src/main/java/de/helmholtz/marketplace/webappserver/controller/SinglePageApplicationErrorController.java

@@ -17,6 +17,12 @@ public class SinglePageApplicationErrorController implements ErrorController
     public Object error(HttpServletRequest request, HttpServletResponse response)
     {
         // FIXME - place the logging code here to log the cause of the error
+        String uri = (String) request.getAttribute("javax.servlet.error.request_uri");
+        if (uri.equals("/tokens")) {
+            return new ResponseEntity<>(
+                    request.getAttribute("javax.servlet.error.message"),
+                    HttpStatus.valueOf((Integer) request.getAttribute("javax.servlet.error.status_code")));
+        }
         if (request.getMethod().equalsIgnoreCase(HttpMethod.GET.name())) {
             response.setStatus(HttpStatus.OK.value());
             return "forward:/index.html";

src/main/resources/application.yml

@@ -8,6 +8,9 @@ logging:
 
 server:
   forward-headers-strategy: NATIVE
+  error:
+    whitelabel:
+      enabled: false
 
 spring:
   resources: