MissingWebServerFactoryBeanException for Spring Boot WebFlux 3.0.0 + Spring Cloud Contract 4.0.0-RC3 + SpringBootTest.WebEnvironment.RANDOM_PORT

[philwebb]

Originally raised in spring-projects/spring-boot#33456 by @davidmelia

---

Hi,

If you create a Spring Boot 3.0.0 WebFlux Starter project and add

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-contract-wiremock</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-contract-verifier</artifactId>
        </dependency>	
...
	<dependencyManagement>
		<dependencies>	          
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>2022.0.0-RC3</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>	
		</dependencies>
	</dependencyManagement>	

then the XXXApplicationTests which have been auto created work fine unless you add webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT e.g.

@ExtendWith({SpringExtension.class})
@SpringBootTest(classes = MyApplication.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
class ApplicationTests {

	@Test
	void contextLoads() {
	}

}

The above results in a org.springframework.boot.web.context.MissingWebServerFactoryBeanException which is a change in behaviour to Spring Boot 2.7.x

There are a few ways around this:

1. Use SpringBootTest.WebEnvironment.MOCK or SpringBootTest.WebEnvironment.NONE
2. Add spring.main.web-application-type=REACTIVE
3. Remove Spring Cloud Contract dependencies
4. Do not upgrade to Spring Boot 3

Thanks

Stack Trace:

2022-12-04T16:26:27.156Z ERROR 14432 --- [           main] o.s.test.context.TestContextManager      : Caught exception while allowing TestExecutionListener [org.springframework.test.context.support.DependencyInjectionTestExecutionListener@41dc0598] to prepare test instance [com.example.demo.ApplicationTests@196ae579]

java.lang.IllegalStateException: Failed to load ApplicationContext for [WebMergedContextConfiguration@2b680207 testClass = com.example.demo.ApplicationTests, locations = [], classes = [com.example.demo.Temp3Application], contextInitializerClasses = [], activeProfiles = [], propertySourceLocations = [], propertySourceProperties = ["org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true"], contextCustomizers = [org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@550ee7e5, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@6c130c45, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@3fb1549b, org.springframework.boot.test.web.reactive.server.WebTestClientContextCustomizer@14555e0a, org.springframework.boot.test.autoconfigure.actuate.observability.ObservabilityContextCustomizerFactory$DisableObservabilityContextCustomizer@9da1, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@53fdffa1, org.springframework.boot.test.context.SpringBootTestAnnotation@ece994bb], resourceBasePath = "src/main/webapp", contextLoader = org.springframework.boot.test.context.SpringBootContextLoader, parent = null]
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:141) ~[spring-test-6.0.2.jar:6.0.2]
	at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:127) ~[spring-test-6.0.2.jar:6.0.2]
	at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:141) ~[spring-test-6.0.2.jar:6.0.2]
	at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:97) ~[spring-test-6.0.2.jar:6.0.2]
	at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:249) ~[spring-test-6.0.2.jar:6.0.2]
	at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:138) ~[spring-test-6.0.2.jar:6.0.2]
	at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$10(ClassBasedTestDescriptor.java:377) ~[junit-jupiter-engine-5.9.1.jar:5.9.1]
	at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.executeAndMaskThrowable(ClassBasedTestDescriptor.java:382) ~[junit-jupiter-engine-5.9.1.jar:5.9.1]
	at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$11(ClassBasedTestDescriptor.java:377) ~[junit-jupiter-engine-5.9.1.jar:5.9.1]
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[na:na]
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[na:na]
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[na:na]
	at java.base/java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:310) ~[na:na]
	at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:735) ~[na:na]
	at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:734) ~[na:na]
	at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) ~[na:na]
	at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeTestInstancePostProcessors(ClassBasedTestDescriptor.java:376) ~[junit-jupiter-engine-5.9.1.jar:5.9.1]
	at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$instantiateAndPostProcessTestInstance$6(ClassBasedTestDescriptor.java:289) ~[junit-jupiter-engine-5.9.1.jar:5.9.1]
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.instantiateAndPostProcessTestInstance(ClassBasedTestDescriptor.java:288) ~[junit-jupiter-engine-5.9.1.jar:5.9.1]
	at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$4(ClassBasedTestDescriptor.java:278) ~[junit-jupiter-engine-5.9.1.jar:5.9.1]
	at java.base/java.util.Optional.orElseGet(Optional.java:364) ~[na:na]
	at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$5(ClassBasedTestDescriptor.java:277) ~[junit-jupiter-engine-5.9.1.jar:5.9.1]
	at org.junit.jupiter.engine.execution.TestInstancesProvider.getTestInstances(TestInstancesProvider.java:31) ~[junit-jupiter-engine-5.9.1.jar:5.9.1]
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$prepare$0(TestMethodTestDescriptor.java:105) ~[junit-jupiter-engine-5.9.1.jar:5.9.1]
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:104) ~[junit-jupiter-engine-5.9.1.jar:5.9.1]
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:68) ~[junit-jupiter-engine-5.9.1.jar:5.9.1]
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$prepare$2(NodeTestTask.java:123) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.prepare(NodeTestTask.java:123) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:90) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) ~[na:na]
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) ~[na:na]
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:35) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:54) ~[junit-platform-engine-1.9.1.jar:1.9.1]
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:147) ~[junit-platform-launcher-1.9.1.jar:1.9.1]
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:127) ~[junit-platform-launcher-1.9.1.jar:1.9.1]
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:90) ~[junit-platform-launcher-1.9.1.jar:1.9.1]
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:55) ~[junit-platform-launcher-1.9.1.jar:1.9.1]
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:102) ~[junit-platform-launcher-1.9.1.jar:1.9.1]
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:54) ~[junit-platform-launcher-1.9.1.jar:1.9.1]
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:114) ~[junit-platform-launcher-1.9.1.jar:1.9.1]
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:95) ~[junit-platform-launcher-1.9.1.jar:1.9.1]
	at org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute(DefaultLauncherSession.java:91) ~[junit-platform-launcher-1.9.1.jar:1.9.1]
	at org.junit.platform.launcher.core.SessionPerRequestLauncher.execute(SessionPerRequestLauncher.java:60) ~[junit-platform-launcher-1.9.1.jar:1.9.1]
	at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:98) ~[.cp/:na]
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:40) ~[.cp/:na]
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:529) ~[.cp/:na]
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:756) ~[.cp/:na]
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:452) ~[.cp/:na]
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210) ~[.cp/:na]
Caused by: org.springframework.context.ApplicationContextException: Unable to start web server
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:164) ~[spring-boot-3.0.0.jar:3.0.0]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:578) ~[spring-context-6.0.2.jar:6.0.2]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.0.0.jar:3.0.0]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:730) ~[spring-boot-3.0.0.jar:3.0.0]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:432) ~[spring-boot-3.0.0.jar:3.0.0]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:308) ~[spring-boot-3.0.0.jar:3.0.0]
	at org.springframework.boot.test.context.SpringBootContextLoader.lambda$loadContext$3(SpringBootContextLoader.java:137) ~[spring-boot-test-3.0.0.jar:3.0.0]
	at org.springframework.util.function.ThrowingSupplier.get(ThrowingSupplier.java:59) ~[spring-core-6.0.2.jar:6.0.2]
	at org.springframework.util.function.ThrowingSupplier.get(ThrowingSupplier.java:47) ~[spring-core-6.0.2.jar:6.0.2]
	at org.springframework.boot.SpringApplication.withHook(SpringApplication.java:1386) ~[spring-boot-3.0.0.jar:3.0.0]
	at org.springframework.boot.test.context.SpringBootContextLoader$ContextLoaderHook.run(SpringBootContextLoader.java:543) ~[spring-boot-test-3.0.0.jar:3.0.0]
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:137) ~[spring-boot-test-3.0.0.jar:3.0.0]
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:108) ~[spring-boot-test-3.0.0.jar:3.0.0]
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:183) ~[spring-test-6.0.2.jar:6.0.2]
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117) ~[spring-test-6.0.2.jar:6.0.2]
	... 72 common frames omitted
Caused by: org.springframework.boot.web.context.MissingWebServerFactoryBeanException: No qualifying bean of type 'org.springframework.boot.web.servlet.server.ServletWebServerFactory' available: Unable to start AnnotationConfigServletWebServerApplicationContext due to missing ServletWebServerFactory bean
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getWebServerFactory(ServletWebServerApplicationContext.java:211) ~[spring-boot-3.0.0.jar:3.0.0]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:181) ~[spring-boot-3.0.0.jar:3.0.0]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:161) ~[spring-boot-3.0.0.jar:3.0.0]
	... 86 common frames omitted

[marcingrzejszczak]

This is my setup

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>3.0.0</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>1854</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>1854</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>17</java.version>
		<spring-cloud.version>2022.0.0-RC3</spring-cloud.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-webflux</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>io.projectreactor</groupId>
			<artifactId>reactor-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>io.rest-assured</groupId>
			<artifactId>spring-web-test-client</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-contract-verifier</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>${spring-cloud.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-contract-maven-plugin</artifactId>
				<version>4.0.0-RC3</version>
				<extensions>true</extensions>
				<configuration>
					<testFramework>JUNIT5</testFramework>
					<testMode>WEBTESTCLIENT</testMode>
				</configuration>
			</plugin>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
	<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>
	<pluginRepositories>
		<pluginRepository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</pluginRepository>
	</pluginRepositories>

</project>

This is my test code

package com.example4;

import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
class ApplicationTests {

	@Test
	void contextLoads() {
	}

}

And this is the outcome of ./mvnw clean install

[INFO] --- maven-install-plugin:3.0.1:install (default-install) @ 1854 ---
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  8.016 s
[INFO] Finished at: 2022-12-05T13:10:45+01:00

I can't replicate this issue - can you provide a reproducer please?

[davidmelia]

@marcingrzejszczak I have created the project here : https://github.com/davidmelia/spring-cloud-contract-issue-1854

The difference is you need both of these for it to fail:

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-contract-wiremock</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-contract-verifier</artifactId>
        </dependency>	

[marcingrzejszczak]

The dependency spring-cloud-contract-wiremock comes with

<groupId>jakarta.servlet</groupId>
          <artifactId>jakarta.servlet-api</artifactId>

Which seems to break things when you have Webflux and Contract on the classpath. The servlet api is used only for rest-docs . So if you're NOT using restdocs and WANT to use Spring Cloud Contract WireMock with Webflux you should exclude that dependency

<dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-contract-wiremock</artifactId>
      <exclusions>
        <exclusion>
          <groupId>jakarta.servlet</groupId>
          <artifactId>jakarta.servlet-api</artifactId>
        </exclusion>
      </exclusions>
    </dependency>

I can update the docs to reflect that. Would that be sufficient of a change?

Another option is to make that dependency optional and document that if you're using RestDocs you should add it manually? Actually RestDocs assumes that that dependency is there at runtime so maybe we should do the same 🤔

[davidmelia]

I think I like your approach of making servlet-api an opt-in dependency.