所以我希望将我的项目从spring boot 1.1.9.RELEASE升级到1.2.1.RELEASE。
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
<version>${spring.boot.version}</version>
</dependency>
然而,在创业时,我获得了:
Exception in thread "Thread-0" 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:176)
at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:51)
at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:346)
at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:149)
at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:112)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:770)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:483)
at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:95)
at com.springagain.Application.run(Application.java:17)
Caused by: java.lang.IllegalArgumentException: No handlers
at org.springframework.util.Assert.isTrue(Assert.java:65)
at org.springframework.web.socket.messaging.SubProtocolWebSocketHandler.start(SubProtocolWebSocketHandler.java:234)
at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:173)
... 8 more
以下是我的websocket配置的外观
@Configuration
@EnableWebSocketMessageBroker
public class WebsocketConfiguration extends
AbstractWebSocketMessageBrokerConfigurer {
@Override
public void configureMessageBroker(MessageBrokerRegistry registry) {
registry.enableStompBrokerRelay("/queue/", "/topic/");
}
@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
// TODO Auto-generated method stub
}
}
切换回只有spring-boot-starter-websocket依赖关系的1.1.9.RELEASE(并将所有其他Spring引导依赖关系保持在1.2.1.RELEASE,弹簧核心保持在4.1.4),异常消失。 / p>
看起来像个错误,但有人可以确认吗?
UPDATE :更多上下文 - 这是来自后端服务器代码 - 没有websocket客户端连接到它。意图是通过RabbitMQ发布“有趣”事件,然后从暴露websocket端点的前端服务器向客户端提供这些事件。我的前端服务器上的代码使用Socksjs支持添加端点:
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/push").withSockJS();
}
从这个角度来看,要么我的理解存在根本缺陷:),或者Spring在检查应该总是存在websocket端点时变得过于热心。
答案 0 :(得分:3)
问题的根源在于您尚未在registerStompEndpoints
中配置任何端点。尝试使用STOMP但尚未配置任何STOMP端点的应用程序无法正常工作。
当您使用Spring Boot 1.1.9.RELEASE时,您的类路径上会有一些Spring Framework 4.0.x jar。 Spring Framework 4.0.x的WebSocket支持并没有注意到配置错误,并允许您的应用程序启动,即使它不能正常工作。 Spring Framework 4.1的WebSocket支持会注意到这种错误配置并引发异常,从而提醒您注意该问题。