MohamedAmin Samet :
I'm creating simple controller server for spring reactive project. While setting redirection to another location, I have found an error when calling http://localhost:8080/
:
There was an unexpected error (type=Internal Server Error, status=500).
ModelAttributeMethodArgumentResolver does not support multi-value reactive type wrapper: interface reactor.netty.http.server.HttpServerResponse
java.lang.IllegalStateException: ModelAttributeMethodArgumentResolver does not support multi-value reactive type wrapper: interface reactor.netty.http.server.HttpServerResponse
at org.springframework.util.Assert.state(Assert.java:94)
at org.springframework.web.reactive.result.method.annotation.ModelAttributeMethodArgumentResolver.resolveArgument(ModelAttributeMethodArgumentResolver.java:112)
at org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:123)
at org.springframework.web.reactive.result.method.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:190)
at org.springframework.web.reactive.result.method.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:133)
at org.springframework.web.reactive.result.method.annotation.RequestMappingHandlerAdapter.lambda$handle$1(RequestMappingHandlerAdapter.java:200)
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:44)
...
This is the controller code:
import reactor.core.publisher.Mono;
import reactor.netty.http.server.HttpServerResponse;
@RestController
public class BaseController {
@GetMapping("/")
public Mono<Void> indexController(HttpServerResponse response) {
return response.sendRedirect("/api/v1");
}
// ...
}
I expected it to be redirected from localhost:8080/
to localhost:8080/api/v1
. But I've got the above exception.
Xarvalus :
Redirecting with Controller MVC good-old approach:
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import reactor.core.publisher.Mono;
import java.net.URI;
@RestController
public class Controller {
@GetMapping("/")
public Mono<Void> indexController(ServerHttpResponse response) {
response.setStatusCode(HttpStatus.PERMANENT_REDIRECT);
response.getHeaders().setLocation(URI.create("/api/v1"));
return response.setComplete();
}
}
If someone would prefer functional Router/Handler approach might investigate: How to redirect a request in spring webflux?.
@Bean
RouterFunction<ServerResponse> routerFunction() {
return route(GET("/"), req ->
ServerResponse.temporaryRedirect(URI.create("/api/v1"))
.build());
}