Question

我正在学习WebSockets的Java API，我有一个问题。每次我连接到端点时，应用程序都会创建2个连接，第一个连接会抛出此异常：

Info:   websocketbot was successfully deployed in 3,174 milliseconds.
Info:   (@OnOpen method) Connection opened.
Info:   (@OnOpen method) Opened connections: 1
Warning:   Already set read listener
java.lang.IllegalStateException: Already set read listener
    at org.apache.catalina.connector.InputBuffer.setReadListener(InputBuffer.java:303)
    at org.apache.catalina.connector.CoyoteInputStream.setReadListener(CoyoteInputStream.java:312)
    at org.glassfish.tyrus.servlet.TyrusHttpUpgradeHandler.init(TyrusHttpUpgradeHandler.java:105)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:777)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:413)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:283)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
    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:748)

Info:   Connection opened.
Info:   Opened connections: 2

我的端点类：

package pckg;

import java.util.logging.Level;
import java.util.logging.Logger;
import javax.websocket.OnClose;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

@ServerEndpoint("/echo")
public class TestEndpoint {

    private static final Logger logger = Logger.getLogger("TestEndpoint");

    @OnOpen
    public void open(Session session) {
        logger.log(Level.INFO, "(@OnOpen method) Connection opened.");
        logger.log(Level.INFO, "(@OnOpen method) Opened connections:" 
                + session.getOpenSessions().size());
    }

    @OnClose
    public void close(Session session) {
        logger.log(Level.INFO, "(@OnClose method) Connection closed.");
        logger.log(Level.INFO, "(@OnClose method) Opened connections:" 
                + session.getOpenSessions().size());
    }
}

当我关闭连接时（例如关闭浏览器），只关闭一个会话实例。

当我实现@OnMessage方法来接收消息和发送消息的方法时，我会收到两次消息。

我想问的是，这是否应该发生。我正在使用NetBeans和GlassFish服务器，过去我遇到过这些问题。

PS：我还尝试了一个名为＆＃34; websocketbot＆＃34;的官方Oracle教程的示例应用程序。（聊天实现）。它的信息也会重复，即使它们显然不应该。我还必须添加一些代码才能使其100％正常工作。

编辑： GlassFish的问题确实存在。它在WildFly服务器上运行正常。

Answer 1

打开glassfish的访问日志后，我遇到了类似的问题。这似乎是玻璃鱼中的一个错误。

https://github.com/payara/Payara/issues/70

Glassfish中的Java EE WebSockets可能＆＃34; zombie＆＃34;连接

1 个答案: