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(); } } 9 Answers
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.
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> 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); } } Likely a corrupt download. Try removing ~/.m2/repository.
You actually just need to change webEnvironment = WebEnvironment.RANDOM_PORT to webEnvironment = WebEnvironment.MOCK in your @SpringBootTest annotation.
@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...
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.
If None of the above solutions work, try adding
@ContextConfiguration(loader = AnnotationConfigContextLoader.class) It may help you
import org.springframework.test.context.support.AnnotationConfigContextLoader; 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
