啟動 Spring 時出錯：啟動 bean 'subProtocolWebSocketHandler' 失敗； 嵌套異常是 java.lang.IllegalArgumentException: No handlers

Question

我正在研究實現 web 套接字的 Spring 引導應用程序，我發現以下問題。

所以首先我有這個WebSocketConfig class 實現WebSocketConfigurer ：

@Configuration
@EnableWebSocket
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketConfigurer {
//public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        registry.addHandler(new SocketTextHandler(), "/deposit-notification");
    }

}

正如您在此處看到的，我正在向相關端點注冊處理程序。

然后我讓這個SocketTextHandler 類實現了實現 web 套接字邏輯的TextWebSocketHandler接口：

@Component
public class SocketTextHandler extends TextWebSocketHandler {

    @Override
    public void handleTextMessage(WebSocketSession session, TextMessage message)
            throws InterruptedException, IOException {

        String payload = message.getPayload();
        JSONObject jsonObject = new JSONObject(payload);
        session.sendMessage(new TextMessage("Hi " + jsonObject.get("user") + " how may we help you?"));
    }

}

我還有這個SocketSecurityConfig擴展AbstractSecurityWebSocketMessageBrokerConfigurer以便在此端點上具有最小的安全配置（僅啟用來自經過身份驗證的用戶的連接）：

public class SocketSecurityConfig extends AbstractSecurityWebSocketMessageBrokerConfigurer {
    
    @Override 
    protected void configureInbound(MessageSecurityMetadataSourceRegistry messages) { 
        messages
          .simpDestMatchers("/deposit-notification").authenticated()
          .anyMessage().authenticated(); 
    }

}

問題是現在運行我的應用程序時，我在 STS 堆棧跟蹤中獲得了此錯誤消息：

2022-02-18 16:59:56.451[0;39m [31mERROR[0;39m [35m28324[0;39m [2m---[0;39m [2m[  restartedMain][0;39m [36mo.s.boot.SpringApplication              [0;39m [2m:[0;39m Application run failed

org.springframework.context.ApplicationContextException: Failed to start bean 'subProtocolWebSocketHandler'; nested exception is java.lang.IllegalArgumentException: No handlers
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181) ~[spring-context-5.3.12.jar:5.3.12]
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:170) ~[spring-context-5.3.12.jar:5.3.12]
    at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54) ~[spring-context-5.3.12.jar:5.3.12]
    at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356) ~[spring-context-5.3.12.jar:5.3.12]
    at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[na:na]
    at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155) ~[spring-context-5.3.12.jar:5.3.12]
    at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123) ~[spring-context-5.3.12.jar:5.3.12]
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935) ~[spring-context-5.3.12.jar:5.3.12]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586) ~[spring-context-5.3.12.jar:5.3.12]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.6.jar:2.5.6]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-2.5.6.jar:2.5.6]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) ~[spring-boot-2.5.6.jar:2.5.6]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) ~[spring-boot-2.5.6.jar:2.5.6]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) ~[spring-boot-2.5.6.jar:2.5.6]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332) ~[spring-boot-2.5.6.jar:2.5.6]
    at com.easydefi.users.GetUserWsApplication.main(GetUserWsApplication.java:15) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:567) ~[na:na]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.5.6.jar:2.5.6]
Caused by: java.lang.IllegalArgumentException: No handlers
    at org.springframework.util.Assert.isTrue(Assert.java:121) ~[spring-core-5.3.12.jar:5.3.12]
    at org.springframework.web.socket.messaging.SubProtocolWebSocketHandler.start(SubProtocolWebSocketHandler.java:270) ~[spring-websocket-5.3.12.jar:5.3.12]
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178) ~[spring-context-5.3.12.jar:5.3.12]
    ... 20 common frames omitted

為什么？ 怎么了？ 我錯過了什么？ 我該如何嘗試解決此問題？

Answer 1

我有同樣的錯誤，通過實現WebSocketMessageBrokerConfigurer而不是AbstractWebSocketMessageBrokerConfigurer解決

    @Configuration
    @EnableWebSocketMessageBroker
    public class WebSocketConfig implements WebSocketMessageBrokerConfigurer   {

        //AbstractWebSocketMessageBrokerConfigurer 


        @Override
        public void configureMessageBroker(MessageBrokerRegistry config) {
            config.enableSimpleBroker("/topic");
            config.setApplicationDestinationPrefixes("/app");
        }


        @Override
        public void registerStompEndpoints(StompEndpointRegistry registry) {
            registry.addEndpoint("/ws").setAllowedOrigins("*").withSockJS(); 
        }


    }