Jetty, websockets and java.lang.NoSuchMethodError

Question

我正在尝试在Jetty 8.1上运行驼峰服务器。WebSocket运行正常，我可以看到Init（）方法中的打印。

但是由于我在驼峰上下文中设置了一个 WebSocket.txt：

<to uri="ws:JettyAlarmEndpoint"/>

我在 Jetty 控制台中遇到此错误：

[                          main] ContextLoader                  ERROR Context initialization failed
org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [META-INF/spring/camel-context.xml]; nested exception is org.springfr
amework.beans.FatalBeanException: Invalid NamespaceHandler class [org.apache.camel.spring.handler.CamelNamespaceHandler] for namespace [http://camel.apache.org/schema/spring]: problem with handler cla
ss file or dependent class; nested exception is java.lang.NoSuchMethodError: org.slf4j.helpers.MessageFormatter.arrayFormat(Ljava/lang/String;[Ljava/lang/Object;)Lorg/slf4j/helpers/FormattingTuple;
        at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:412)
        at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)

即： java.lang.NoSuchMethodError： org.slf4j.helpers.MessageFormatter.arrayFormat（Ljava/lang/String;[Ljava/lang/Object;）Lorg/slf4j/helpers/FormattingTuple;

我的 WebSocket 很简单，如您所见：

package com.thales.ktdscis.server;
import java.io.IOException;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.websocket.WebSocket;
import org.eclipse.jetty.websocket.WebSocket.OnTextMessage;
import org.eclipse.jetty.websocket.WebSocketServlet;
import com.thales.ktdscis.utils.JSONUtils;
/**
 * Servlet implementation class RiaWebSocket
 */
@WebServlet("/test")
public class JettyEndpoint extends WebSocketServlet {
    private static final long           serialVersionUID    = -1798046558917516877L;
    public static final boolean         DEBUG               = false;
    public final Set<ObserverWebSocket> users               = new CopyOnWriteArraySet<ObserverWebSocket>();
    @Override
    public void init() throws ServletException {
            System.out.println(" XXX JettyEndpoint().Init() XXX ");
        super.init();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    }
    @Override
    public WebSocket doWebSocketConnect(HttpServletRequest arg0, String arg1) {
        return new ObserverWebSocket(users);
    }
    public class ObserverWebSocket implements OnTextMessage {
        private Connection              connection;
        private Set<ObserverWebSocket>  users;
        public ObserverWebSocket(Set<ObserverWebSocket> users) {
            this.users = users;
        }
        public void onMessage(String message) {
            System.out.println("Message received : " + message);
            unicast(message);
        }
        private void unicast(String message) {
            try {
                this.connection.sendMessage(message);
            }
            catch (IOException e) {
                e.printStackTrace();
            }
        }
        private void broadcast(String message) {
            for (ObserverWebSocket user : users) {
                try {
                    user.connection.sendMessage(message);
                }
                catch (Exception e) {
                }
            }
        }
        @Override
        public void onOpen(Connection connection) {
            this.connection = connection;
            users.add(this);
        }
        @Override
        public void onClose(int closeCode, String message) {
            users.remove(this);
        }
    }
}

我已经阅读了很多关于类路径中缺少.jar的论坛，当我打开 lib .jar时，我的类路径中有"缺少方法"。

我尝试过javax。WebSocket 和 import org.eclipse.jetty.websocket.WebSocket.总是相同的错误。我想在每次调用"to"路由时在我的 webSocket 中运行一个特定的方法。理想情况下，向客户端列表发送消息。

你知道???吗

Answer 1

你的类路径中有多个 slf4j jar。 可能版本不匹配。

这已经在堆栈溢出中得到了解答：使用logback/slf4j时引发的异常