Java Spring 4 MVC 和 Websockets - 没有合适的默认 RequestUpgradeStrategy
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Spring 4 MVC and Websockets - No suitable default RequestUpgradeStrategy
提问by pat
I need Websockets for real-time updates in my application. So i found this example and did it step by step here. I went through the tutorial and finally i got this exception when starting the application:
我需要 Websockets 在我的应用程序中进行实时更新。所以我找到了这个例子并在这里一步一步地做到了。我完成了教程，最后在启动应用程序时遇到了这个异常：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name'org.springframework.web.socket.server.support.DefaultHandshakeHandler#0': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.web.socket.server.support.DefaultHandshakeHandler]: Constructor threw exception; nested exception is java.lang.IllegalStateException: No suitable default RequestUpgradeStrategy found
org.springframework.beans.factory.BeanCreationException: Error creating bean with name'org.springframework.web.socket.server.support.DefaultHandshakeHandler#0'：bean实例化失败；嵌套异常是 org.springframework.beans.BeanInstantiationException：无法实例化 bean 类 [org.springframework.web.socket.server.support.DefaultHandshakeHandler]：构造函数抛出异常；嵌套异常是 java.lang.IllegalStateException：找不到合适的默认 RequestUpgradeStrategy
I have searched a lot, but i didn't find a solution.
我已经搜索了很多，但我没有找到解决方案。
I hope anyone can help me, thanks in advance.
我希望任何人都可以帮助我，在此先感谢。
best regards, patrick
最好的问候，帕特里克
回答by Prabhat
I am also facing this problem, got across a link see if this is helpful https://github.com/rstoyanchev/spring-websocket-portfolio/issues/21
我也面临这个问题，通过一个链接看看这是否有帮助https://github.com/rstoyanchev/spring-websocket-portfolio/issues/21
回答by Balázs Palkó
I managed to resolve this issue by adding the following maven dependency:
我设法通过添加以下 Maven 依赖项来解决此问题：
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-websocket</artifactId>
<version>7.0.52</version>
</dependency>
As pointed by Craig Otis, if you're planning on deploying to Tomcat anyway, you should use <scope>test</scope>to ensure you don't include the dependency in your build artifact.
正如 Craig Otis 所指出的，如果您打算无论如何都部署到 Tomcat，您应该使用<scope>test</scope>以确保您的构建工件中不包含依赖项。
回答by raymond
回答by Tk421
The version of Tomcat that you are using is too old.
您使用的 Tomcat 版本太旧。
Upgrade tomcat. http://tomcat.apache.org/download-70.cgi
升级tomcat。 http://tomcat.apache.org/download-70.cgi
回答by darkconeja
I lost a lot of time digging out for the solution, what i found was that spring websocket will only run over Tomcat 7.0.47+, Jetty 9.1+, GlassFish 4.1+, WebLogic 12.1.3+, and Undertow 1.0+ (and WildFly 8.0+)according to spring's documentation shown here http://docs.spring.io/spring/docs/current/spring-framework-reference/html/websocket.html, so try updating your app server
我花了很多时间寻找解决方案，我发现 spring websocket 只能在Tomcat 7.0.47+、Jetty 9.1+、GlassFish 4.1+、WebLogic 12.1.3+ 和 Undertow 1.0+（和 WildFly 8.0+)根据此处显示的 spring 文档 http://docs.spring.io/spring/docs/current/spring-framework-reference/html/websocket.html，因此请尝试更新您的应用服务器
回答by Munish Chandel
I was facing this issue while running websockets in IDE using embedded Jetty, fixed this after adding the below dependencies to pom.xml
我在使用嵌入式 Jetty 在 IDE 中运行 websockets 时遇到了这个问题，在将以下依赖项添加到 pom.xml 后修复了这个问题
<dependency>
<groupId>org.eclipse.jetty.websocket</groupId>
<artifactId>websocket-client</artifactId>
<version>9.3.4.RC0</version>
<!--<scope>test</scope>-->
</dependency>
<dependency>
<groupId>org.eclipse.jetty.websocket</groupId>
<artifactId>websocket-server</artifactId>
<version>9.3.4.RC0</version>
<!--<scope>test</scope>-->
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-client</artifactId>
<version>9.3.4.RC0</version>
<!--<scope>test</scope>-->
</dependency>
