Unable to start ReactiveWebApplicationContext due to missing ReactiveWebServerFactory bean

Question

I have a new springboot application I am attempting to get started.

The error I receive is

org.springframework.context.ApplicationContextException: Unable to start reactive web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ReactiveWebApplicationContext due to missing ReactiveWebServerFactory bean.
    at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.onRefresh(ReactiveWebServerApplicationContext.java:76) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]

src/main/java/bubbleshadow/RootController.java

package bubbleshadow;

import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import reactor.core.publisher.Mono;

@RestController
public class RootController {
  public RootController() {

  }

  @GetMapping("/")
  public Mono<HttpStatus> returnOk() {
    return Mono.just(HttpStatus.OK);
  }
}

src/test/java/test/bubbleshadow/RootControllerTest.java

package test.bubbleshadow;
import bubbleshadow.RootController;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;
// import org.springframework.boot.test.autoconfigure.web.reactive.WebFluxTest;
import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient;
import org.springframework.test.web.reactive.server.WebTestClient;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit.jupiter.SpringExtension;
import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;

@ExtendWith(SpringExtension.class)
@SpringBootTest(classes=RootController.class, webEnvironment = WebEnvironment.RANDOM_PORT)
@AutoConfigureWebTestClient
public class RootControllerTest {
  @Autowired
  WebTestClient webTestClient;

  @Test
  public void baseRouteShouldReturnStatusOK() {
    webTestClient.head().uri("/").exchange().expectStatus().isOk();
  }
}

vdou · Answer 1 · 2018-09-23T21:25:42.243

16

Your configuration is not sufficient for reactive tests.

The reactive WebTestClient as well as ReactiveWebApplicationContext need reactive server in the application context. Add annotation @EnableAutoConfiguration to your RootControllerTest and let Spring's do it for you.

The autoconfiguration searches your class path and after find reactive classes and reactive context then create ReactiveWebServerFactory bean.

edited Sep 23 '18 at 21:25

answered Sep 23 '18 at 21:16

vdou

281
3
5

2

I'm using Spring Boot version 2.2.5.RELEASE, and I also had to add the classes explicitly to the `@SpringBootTest` annotation (even though they were annotated with `@Configuration` and `@Component` respectively): `@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, classes = {FooConfig.class, FooHandler.class})` – user2337270 Apr 28 '20 at 00:38
I guess maybe a `@ComponentScan` annotation with the appropriate packages might do the trick as well. – user2337270 Apr 28 '20 at 00:46

score 15 · Answer 2 · answered Jun 17 '18 at 16:43

15

I assume you are using maven to get your dependencies.

I solved the problem by using:

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-webflux</artifactId>
        <version>2.0.3.RELEASE</version>
    </dependency>

Instead of:

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webflux</artifactId>
        <version>5.0.7.RELEASE</version>
    </dependency>

answered Jun 17 '18 at 16:43

François Dupire

585
3
11
32

Did you try Aniket solution ? Removing your ~/.m2/repository ? – François Dupire Jun 28 '18 at 13:48
I was able to solve that by adding a @ComponentScan to the Application or Configuration – Stephan Mar 19 '19 at 13:57

score 11 · Answer 3 · edited Jun 11 '19 at 11:16

11

For me, the error was being caused by a missing @SpringBootApplication annotation on the Spring class containing the main() method entry point which actually starts the Boot application. Using the following resolved the error:

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

edited Jun 11 '19 at 11:16

D. Spreuer

47
8

answered Mar 04 '19 at 03:51

Tim Biegeleisen

502,043
27
286
360

score 4 · Answer 4 · edited Mar 19 '19 at 13:42

4

Likely a corrupt download. Try removing ~/.m2/repository.

edited Mar 19 '19 at 13:42

Stephan

4,395
3
26
49

answered Jun 17 '18 at 17:10

Aniket Kulkarni

1,985
2
17
22

score 4 · Answer 5 · answered May 28 '20 at 14:00

4

You actually just need to change webEnvironment = WebEnvironment.RANDOM_PORT to webEnvironment = WebEnvironment.MOCK in your @SpringBootTest annotation.

answered May 28 '20 at 14:00

petronius

451
3
11

score 1 · Answer 6 · answered May 31 '22 at 07:36

@vdou's answer helped me to resolve my issue.

In addition to adding @EnableAutoConfiguration, I also had to manually add the spring application type:

spring:
  main:
    web-application-type: reactive

There is obviously something in my dependencies that is causing Spring not to be able to discover the type.

I hope this helps somebody...

score 0 · Answer 7 · answered Jun 22 '22 at 20:30

If you are using Kotlin, check if in your Application class that contains the main method, doesnt have this:

runApplication<Application>{
    webApplicationType = WebApplicationType.REACTIVE
}

Then change the "REACTIVE" to "SERVELET", will work like a charm.

score 0 · Answer 8 · edited Nov 21 '22 at 13:10

0

If None of the above solutions work, try adding

@ContextConfiguration(loader = AnnotationConfigContextLoader.class)

It may help you

import org.springframework.test.context.support.AnnotationConfigContextLoader;

edited Nov 21 '22 at 13:10

Javier

12,100
5
46
57

answered Nov 16 '22 at 09:56

Jagdish Pawar

1

score 0 · Answer 9 · answered Nov 30 '22 at 14:28

0

Yet another reason this can occur is if you're importing in a configuration class for your test that is not marked with @TestConfiguration annotation

answered Nov 30 '22 at 14:28

MotiNK

421
2
12

Unable to start ReactiveWebApplicationContext due to missing ReactiveWebServerFactory bean

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