Spring boot Test fails saying, Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean

Question

Test Class:-

@RunWith(SpringRunner.class) @SpringBootTest(classes = { WebsocketSourceConfiguration.class,         WebSocketSourceIntegrationTests.class }, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, properties = {                 "websocket.path=/some_websocket_path", "websocket.allowedOrigins=*",                 "spring.cloud.stream.default-binder=kafka" }) public class WebSocketSourceIntegrationTests {      private String port = "8080";      @Test     public void testWebSocketStreamSource() throws IOException, InterruptedException {         StandardWebSocketClient webSocketClient = new StandardWebSocketClient();         ClientWebSocketContainer clientWebSocketContainer = new ClientWebSocketContainer(webSocketClient,                 "ws://localhost:" + port + "/some_websocket_path");         clientWebSocketContainer.start();         WebSocketSession session = clientWebSocketContainer.getSession(null);         session.sendMessage(new TextMessage("foo"));         System.out.println("Done****************************************************");     }  } 

I have seen same issue here but nothing helped me. May I know what I'm missing ?

I have spring-boot-starter-tomcat as compile time dependency in the dependency Hierarchy.

Answer 1

This message says: You need to configure at least 1 ServletWebServerFactory bean in the ApplicationContext, so if you already have spring-boot-starter-tomcat you need to either autoconfigure that bean or to do it manually.

So, in the test there are only 2 configuration classes to load the applicationContext, these are = { WebsocketSourceConfiguration.class, WebSocketSourceIntegrationTests.class }, then at least in one of these classes there should be a @Bean method returning an instance of the desired ServletWebServerFactory.

* SOLUTION *

Make sure to load all the beans within your configuration class

WebsocketSourceConfiguration {   @Bean    ServletWebServerFactory servletWebServerFactory(){   return new TomcatServletWebServerFactory();   } } 

OR also enable the AutoConfiguration to do a classpath scanning and auto-configuration of those beans.

@EnableAutoConfiguration WebsocketSourceConfiguration 

Can be done also at the Integration Test class.

@EnableAutoConfiguration WebSocketSourceIntegrationTests 

For more information check the SpringBootTest annotation documentation https://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/test/context/SpringBootTest.html