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使用 eclipse mars 和 glass fish，我制作了一个本地服务器。在同一个包中，我有一个名为 MyClass.java 的类。每次，服务器收到一条消息，我希望消息由 MyClass （及其方法）处理。这就是我所拥有的：

package com.MT;

import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.server.ServerEndpoint;

@ServerEndpoint("/serverendpointdemo")
public class ServerEndpointDemo {
    @OnOpen
    public void handleOpen () {
        System.out.println("JAVA: Client is now connected...");
    }

    @OnMessage
    public String handleMessage (String message) {
        System.out.println("JAVA: Received from client: "+ message);
        MyClass x = new MyClass();
        String replyMessage = x.someMethod(message);
        //System.out.println("JAVA: Send to Client ==> "+ replyMessage);
//      String replyMessage = "echo "+ message;
//      System.out.println("JAVA: Send to client: "+ replyMessage);
        return replyMessage;
    }

    @OnClose
    public void handleClose() {
        System.out.println("JAVA: Client is now disconnected...");
    }

    @OnError
    public void handleError (Throwable t) {
        t.printStackTrace();
    }


}

问题是编译器给了我这个消息：

2015-10-26T22:36:37.088-0400|Severe: java.lang.NoClassDefFoundError: edu.someClass
    at com.MT.MyClass.(MedicalTranscriptRev4.java:35)
    at com.MT.ServerEndpointDemo.handleMessage(ServerEndpointDemo.java:20)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.glassfish.tyrus.core.AnnotatedEndpoint.callMethod(AnnotatedEndpoint.java:520)
    at org.glassfish.tyrus.core.AnnotatedEndpoint.access$100(AnnotatedEndpoint.java:87)
    at org.glassfish.tyrus.core.AnnotatedEndpoint$WholeHandler$1.onMessage(AnnotatedEndpoint.java:619)
    at org.glassfish.tyrus.core.TyrusSession.notifyMessageHandlers(TyrusSession.java:576)
    at org.glassfish.tyrus.core.TyrusEndpointWrapper.onMessage(TyrusEndpointWrapper.java:871)
    at org.glassfish.tyrus.core.TyrusWebSocket.onMessage(TyrusWebSocket.java:212)
    at org.glassfish.tyrus.core.frame.TextFrame.respond(TextFrame.java:139)
    at org.glassfish.tyrus.core.ProtocolHandler.process(ProtocolHandler.java:807)
    at org.glassfish.tyrus.core.TyrusWebSocketEngine$TyrusReadHandler.handle(TyrusWebSocketEngine.java:562)
    at org.glassfish.tyrus.servlet.TyrusHttpUpgradeHandler.onDataAvailable(TyrusHttpUpgradeHandler.java:173)
    at org.apache.catalina.connector.InputBuffer$ReadHandlerImpl.processDataAvailable(InputBuffer.java:488)
    at org.apache.catalina.connector.InputBuffer$ReadHandlerImpl.onDataAvailable(InputBuffer.java:453)
    at org.glassfish.grizzly.http.io.InputBuffer.invokeHandler(InputBuffer.java:1089)
    at org.glassfish.grizzly.http.io.InputBuffer.invokeHandlerOnProperThread(InputBuffer.java:1080)
    at org.glassfish.grizzly.http.io.InputBuffer.append(InputBuffer.java:963)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:271)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: edu.someClass
    at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1783)
    at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1633)
    ... 36 more

我已确保作为外部 JAR 文件中的类的 edu.someClass 在我的类路径中。但它仍然无法正常工作。任何想法？

问题是每次服务器收到新消息时都需要编译 MyClass 吗？所以我做了一个虚拟类来测试它是否每次都编译并且确实如此。但是这个虚拟类没有任何 JAR 文件（import与 MyClass 相比，它没有类）。

这是屏幕截图：

在此处输入图像描述

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