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 · Accepted Answer · 2018-09-23 21:25:42Z

20

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, 2018 at 21:25

answered Sep 23, 2018 at 21:16

vdou

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2 Comments

user2337270 Over a year ago

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 Over a year ago

I guess maybe a @ComponentScan annotation with the appropriate packages might do the trick as well.

fddev · Accepted Answer · 2018-06-17 16:43:32Z

16

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, 2018 at 16:43

fddev

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2 Comments

fddev Over a year ago

Did you try Aniket solution ? Removing your ~/.m2/repository ?

Stephan Over a year ago

I was able to solve that by adding a @ComponentScan to the Application or Configuration

D. Spreuer · Accepted Answer · 2019-06-11 11:16:52Z

13

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, 2019 at 11:16

D. Spreuer

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answered Mar 4, 2019 at 3:51

Tim Biegeleisen

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Comments

petronius · Accepted Answer · 2020-05-28 14:00:07Z

5

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

answered May 28, 2020 at 14:00

petronius

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Comments

Stephan · Accepted Answer · 2019-03-19 13:42:51Z

4

+25

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

edited Mar 19, 2019 at 13:42

Stephan

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answered Jun 17, 2018 at 17:10

Aniket Kulkarni

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Comments

apoplexy · Accepted Answer · 2022-05-31 07:36:08Z

1

@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...

answered May 31, 2022 at 7:36

apoplexy

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Comments

Jens · Accepted Answer · 2024-03-17 13:01:47Z

1

I was getting the same problem and it was fixed by doing -

Added in build.gradle -

implementation  "org.springframework.boot:spring-boot-starter-webflux"

Added in application.properties -

spring.main.web-application-type = REACTIVE

And compatibility could be the problem as well so using spring boot version 3.2.0 and springCloudVersion version as "2023.0.0" Is still unable to fix the issue with above configurations, try to install Intellij Idea and it would work fine. Use Java 17 for the same. If it fixes your problem hit up button.

edited Mar 17, 2024 at 13:01

Jens

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answered Mar 17, 2024 at 4:26

Rohit Kasture

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Comments

Jhonatan S. Souza · Accepted Answer · 2022-06-22 20:30:30Z

0

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.

answered Jun 22, 2022 at 20:30

Jhonatan S. Souza

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Comments

Javier · Accepted Answer · 2022-11-21 13:10:28Z

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, 2022 at 13:10

Javier

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answered Nov 16, 2022 at 9:56

Jagdish Pawar

1

Comments

MotiNK · Accepted Answer · 2022-11-30 14:28:10Z

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, 2022 at 14:28

MotiNK

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