EndpointController.serveEndpoint resolves in 415 "text/plain:charset:UTF-8"

Hilla
1

I am kind of stuck on where to look. on startup of the application I receive the following error:

 Could not resolve parameter [2] in public org.springframework.http.ResponseEntity<java.lang.String> com.vaadin.hilla.EndpointController.serveEndpoint(java.lang.String,java.lang.String,com.fasterxml.jackson.databind.node.ObjectNode,jakarta.servlet.http.HttpServletRequest,jakarta.servlet.http.HttpServletResponse): Content-Type 'text/plain;charset=UTF-8' is not supported

Also in the trace logging I cannot find what endpoint is causing this issue.
Has anybody got some hints for me on where to look further into this?

I am using vaadin 24.6.2 and spring 3.4.1

2

That error message is generated by Spring and seems to indicate that the body of your request is in text/plain format where a JSON body is expected to be assigned to an ObjectNode.

3

The tracelogs seem to indicate something from vaadin push?

2025-01-27T10:33:21.448+01:00 DEBUG 86337 --- [nio-8080-exec-7] o.s.web.servlet.DispatcherServlet        : POST "/VAADIN/push?v-r=push&v-uiId=9&v-pushId=d450a504-fb69-4a9c-b93c-2db70cc37085&X-Atmosphere-Transport=close&X-Atmosphere-tracking-id=85ddc642-a67c-4ffb-bd6a-6ad72df5af7d&X-Vaadin-LastSeenServerSyncId=26", parameters={masked}
2025-01-27T10:33:21.449+01:00 DEBUG 86337 --- [nio-8080-exec-7] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to com.vaadin.hilla.EndpointController#serveEndpoint(String, String, ObjectNode, HttpServletRequest, HttpServletResponse)
2025-01-27T10:33:21.463+01:00 DEBUG 86337 --- [nio-8080-exec-7] o.s.web.method.HandlerMethod             : Could not resolve parameter [2] in public org.springframework.http.ResponseEntity<java.lang.String> com.vaadin.hilla.EndpointController.serveEndpoint(java.lang.String,java.lang.String,com.fasterxml.jackson.databind.node.ObjectNode,jakarta.servlet.http.HttpServletRequest,jakarta.servlet.http.HttpServletResponse): Content-Type 'text/plain;charset=UTF-8' is not supported
2025-01-27T10:33:21.464+01:00  WARN 86337 --- [nio-8080-exec-7] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content-Type 'text/plain;charset=UTF-8' is not supported]
2025-01-27T10:33:21.464+01:00 DEBUG 86337 --- [nio-8080-exec-7] o.s.web.servlet.DispatcherServlet        : Completed 415 UNSUPPORTED_MEDIA_TYPE

Does this look like I have something misconfigured?

4

EndpointController is mapped to /connect by default, so unless you have changed the default mapping, it should not receive a call sent to /VAADIN. The two things should be unrelated.

5

Ah yes I see, you are right, caught the exception and the VAADIN/push causes this.

'text/plain;charset=UTF-8' at endpoint '/VAADIN/push' -> ServletWebRequest: uri=/VAADIN/push;client=0:0:0:0:0:0:0:1;session=605FFC23C036F732C58DE86EF77A9019

this is the only endpoint which is causing this. might this be something in a security configuration? It only happens when I reload a page.

6

The original error clearly mentions com.vaadin.hilla.EndpointController.serveEndpoint, which is mapped to /connect. As I wrote before, Vaadin push shouldn’t be the cause of that error.

Despite being near each other in the logs, they should be unrelated.

I suggest to inspect any request coming from the browser to the Hilla endpoint to find the one that gets the error returned.

7

If really the push call is going to the Hilla endpoint, the project is misconfigured. Do you have vaadin.endpoint.prefix in your application properties?

8

Hello Luciano, your last comment gave me a hint and it turned out the @EnableWebMvc was on which caused all this. so a custom WebMvc fixed the issue. Thankyou for the help