Unable to Start Reactivewebapplicationcontext Due to Missing Reactivewebserverfactory Bean
I Have a New Springboot Application I Am Attempting to Get Started. the Error I Receive Is Org. Springframework. Context. Applicationcontextexception: Unable...
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
Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.
