Question

我试图在项目中使用SimpMessagingTemplate类通过websocket发送一些数据。问题是我总是有一个错误，这是完整的错误：

Error creating bean with name 'webSocketUserNotificationManagerImpl' defined in URL [...]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.messaging.simp.SimpMessagingTemplate' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}

这是webSocketuserNotificationManagerImpl服务：

@Service
public class WebSocketUserNotificationManagerImpl implements UserNotificationManager {

    /**
     * Template to use to send back a message to the user via Web-socket.
     */
    private SimpMessagingTemplate template;

    public WebSocketUserNotificationManagerImpl(SimpMessagingTemplate template) {
        this.template = template;
    }

    private ObjectMapper jsonMapper = new ObjectMapper();

    @Override
    public void sendMessageToUser(String jobName, String eventType, Result result) {
       ....
    }

    public void sendDeleteMessageToUser(DeleteRequestsSocketMessage message, Principal principal) {
        this.template.convertAndSendToUser(principal.getName().toLowerCase(),
                                           "/status/delete", message);
    }
}

我在pom中具有这种依赖性：

<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-messaging</artifactId>
</dependency>

怎么了，为什么SimpMessagingTemplate bean不存在？

Answer 1

好的，因此在您的应用程序上下文中找不到bean SimpMessagingTemplate。因此，请确保在启动时在应用程序上下文中由spring自动创建bean，并根据需要提供注释，例如：

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

}

尝试使用构造函数注入，如：

@Autowired
public WebSocketUserNotificationManagerImpl(SimpMessagingTemplate template) {
    this.template = template;
}

SimpMessagingTemplate没有类型的合格Bean

1 个答案: