SpringBoot test fails with 'No bean named 'webHandler' available'

Question

I am trying to run SpringBoot Webflux tests but am getting error No bean named 'webHandler' available I was trying to follow the Spring test docs for webtestclient

The offending line seems to be in setup()

public WebTestClient webTestClient;

@Before
public void setUp() {
    webTestClient = WebTestClient.bindToApplicationContext(this.context).build();

My annotations are:

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, classes = MyApplication.class)
@ActiveProfiles("offlineuno")

The stack trace is:

org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'webHandler' available
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:771)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1221)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:294)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:204)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1111)
    at org.springframework.web.server.adapter.WebHttpHandlerBuilder.applicationContext(WebHttpHandlerBuilder.java:157)
    at org.springframework.test.web.reactive.server.ApplicationContextSpec.initHttpHandlerBuilder(ApplicationContextSpec.java:43)
    at org.springframework.test.web.reactive.server.AbstractMockServerSpec.configureClient(AbstractMockServerSpec.java:86)
    at org.springframework.test.web.reactive.server.AbstractMockServerSpec.build(AbstractMockServerSpec.java:107)
    at com.cme.clearing.btec.risk.btec.entity.management.web.EntityMgmtControllerTest.setUp(MyControllerTest.java:55)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

Update: As a workaround, I am using

 webTestClient = WebTestClient.bindToServer().baseUrl("http://localhost:8080").build();

Now I manually run the spring boot server (in IntelliJ) and then run the Test client.

Answer 1

I had a similar issue, to get around it in my Test I did the following:

@WebFluxTest(
        controllers = {
                xxxController.class
        })
public class xxxControllerTest {
    @Autowired
    private WebTestClient webTestClient;

    @MockBean
    private xxxDetailsService xxxDetailsService;

    @Test
    void methodName_shouldReturnWhateverObject_givenCondition() throws Exception {

        String expectedJson = "{...}";

        Mono<xxxDetails> result = Mono.just(...);

        doReturn(result).when(xxxDetailsService).getxxxDetails("value");

        webTestClient.get()
                .uri("/path/{xxxValue}", "value")
                .exchange()
                .expectStatus().isOk()
                .expectHeader().contentType(MediaType.APPLICATION_JSON)
                .expectBody().json(expectedJson);
    }

}

Answer 2

WebTestClient.bindToApplicationContext is for application running on Netty

I guess your application is servlet and you should use

MockMvcWebTestClient.bindToApplicationContext

Reference:

1. https://docs.spring.io/spring-framework/docs/current/reference/html/testing.html#webtestclient-context-config
2. https://github.com/spring-projects/spring-framework/issues/22544#issuecomment-791494782