代码如何确定使用WebSphereRequestUpgradeStrategy和TomcatRequestUpgradeStrategy？

Question

我正在尝试使用websockets，我的Spring应用程序在Websphere Liberty上运行。我的Websockets连接不起作用，并且在使用类库调试时，我发现我的代码转到TomcatRequestUpgradeStrategy并且这个代码不起作用，而使用WebSphereRequestUpgradeStrategy的代码工作正常。我不清楚如何确定这项工作的逻辑？我已经设置了我的pom中提供的spring-boot-starter-tomcat。所以我不清楚它是如何导致它使用TomcatRequestUpgradeStrategy的。有人可以帮我弄这个吗？

工作：

SRTServletRequest31.upgrade(Class<T>) line: 157 
WsocHandlerImpl.handleRequest(HttpServletRequest, HttpServletResponse, ServerEndpointConfig, Map<String,String>, boolean) line: 268 
ServerContainerExt.doUpgrade(HttpServletRequest, HttpServletResponse, ServerEndpointConfig, Map<String,String>) line: 288   
NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method]  
NativeMethodAccessorImpl.invoke(Object, Object[]) line: 62  
DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43  
Method.invoke(Object, Object...) line: 498  
WebSphereRequestUpgradeStrategy.upgradeInternal(ServerHttpRequest, ServerHttpResponse, String, List<Extension>, Endpoint) line: 87  
WebSphereRequestUpgradeStrategy(AbstractStandardUpgradeStrategy).upgrade(ServerHttpRequest, ServerHttpResponse, String, List<WebSocketExtension>, Principal, WebSocketHandler, Map<String,Object>) line: 119    
DefaultHandshakeHandler(AbstractHandshakeHandler).doHandshake(ServerHttpRequest, ServerHttpResponse, WebSocketHandler, Map<String,Object>) line: 281    
WebSocketHttpRequestHandler.handleRequest(HttpServletRequest, HttpServletResponse) line: 166

不工作：

SRTServletRequest31.upgrade(Class<T>) line: 157 
RequestWrapper(HttpServletRequestWrapper).upgrade(Class<T>) line: 399   
HttpSessionSecurityContextRepository$Servlet3SaveToSessionRequestWrapper(HttpServletRequestWrapper).upgrade(Class<T>) line: 399 
HttpServlet3RequestFactory$Servlet3SecurityContextHolderAwareRequestWrapper(HttpServletRequestWrapper).upgrade(Class<T>) line: 399  
UpgradeUtil.doUpgrade(WsServerContainer, HttpServletRequest, HttpServletResponse, ServerEndpointConfig, Map<String,String>) line: 234   
WsServerContainer.doUpgrade(HttpServletRequest, HttpServletResponse, ServerEndpointConfig, Map<String,String>) line: 265    
TomcatRequestUpgradeStrategy.upgradeInternal(ServerHttpRequest, ServerHttpResponse, String, List<Extension>, Endpoint) line: 72 
TomcatRequestUpgradeStrategy(AbstractStandardUpgradeStrategy).upgrade(ServerHttpRequest, ServerHttpResponse, String, List<WebSocketExtension>, Principal, WebSocketHandler, Map<String,Object>) line: 119   
DefaultHandshakeHandler(AbstractHandshakeHandler).doHandshake(ServerHttpRequest, ServerHttpResponse, WebSocketHandler, Map<String,Object>) line: 281    
WebSocketHttpRequestHandler.handleRequest(HttpServletRequest, HttpServletResponse) line: 166    

如果您需要更多详细信息，请告诉我。感谢任何回应。

Answer 1

我想出了我的问题的答案。这可能对将来的其他人有所帮助。

DefaultHandshakeHandler检查了类加载器中是否存在org.apache.tomcat.websocket.server.WsHttpUpgradeHandler。由于pom依赖中存在tomcat-embed-websocket，因此该类存在。所以，即使我在Liberty上运行，也会被触发。从pom中删除它，帮助我解决了问题。