[英]Jetty WebSocket
我對jetty 8.1.10.v20130312和WebSocket有疑問。 這是代碼:
web.xml中
<listener>
<listener-class>ru.websocket.StartupListener</listener-class>
</listener>
StartupListener.java
public class StartupListener implements ServletContextListener {
public void contextDestroyed(ServletContextEvent arg0) {
}
public void contextInitialized(ServletContextEvent arg0) {
Server server = new Server(8081);
EventHandler handler = new EventHandler();
server.setHandler(handler);
try {
server.start();
System.out.println("Server started");
} catch (Exception e) {
e.printStackTrace();
}
}
}
EventHandler.java
public class EventHandler extends WebSocketHandler {
public WebSocket doWebSocketConnect(HttpServletRequest arg0, String arg1) {
return new EventWebSocket();
}
}
EventWebSocket.java
public class EventWebSocket implements WebSocket {
public void onClose(int arg0, String arg1) {
System.out.println("closed");
}
public void onOpen(Connection arg0) {
System.out.println("opened");
}
}
當我想從JavaScript連接時,我有一個錯誤消息
2013-07-15 18:02:02.433:WARN:oejs.AbstractHttpConnection:/
java.lang.NullPointerException
at org.eclipse.jetty.websocket.WebSocketFactory.upgrade(WebSocketFactory.java:238)
at org.eclipse.jetty.websocket.WebSocketFactory.acceptWebSocket(WebSocketFactory.java:396)
at org.eclipse.jetty.websocket.WebSocketHandler.handle(WebSocketHandler.java:43)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:368)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:942)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1004)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:640)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:662)
關於build,我使用maven,java版本1.6.31,jetty版本8.1.10.v20130312。 重要我想在端口8080(StartupListener)上從Jetty啟動端口8081的新Jetty服務器。
謝謝你的回答。
org.eclipse.jetty.websocket.WebSocketFactory.upgrade(WebSocketFactory.java:238)
的java.lang.NullPointerException
意味着你......
這是因為在WebSocket握手的升級過程中無法找到核心HTTP連接,這是Jetty WebSocket服務器代碼運行的要求。
您是否使用RunjettyRun eclipse插件來運行您的Web應用程序?
如果是,請檢查“運行配置”,
將“選擇Jetty版本”下拉列表框設置為Jetty 8,例如“Jetty 8.1.2.v20120308”
您只能在Jetty 8或更高版本上運行websocket Web應用程序。
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