Jakarta ee java.lang.IllegalStateException:异步上下文#complete（）时未挂起

有时，我的Servlet以以下异常结束：

    WARNING: StandardWrapperValve[HeartBeatServlet]: PWC1406: Servlet.service() for servlet HeartBeatServlet threw exception
java.lang.IllegalStateException: Not Suspended
    at com.sun.grizzly.tcp.Response.resume(Response.java:768)
    at org.apache.catalina.connector.Request.asyncComplete(Request.java:3993)
    at org.apache.catalina.connector.AsyncContextImpl.complete(AsyncContextImpl.java:242)
    at com.northcane.talkeen.HeartBeatServlet.doPost(HeartBeatServlet.java:47)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:722)

这是我的Servlet的源代码。它所做的唯一事情是处理来自javascript客户端的长轮询请求，并将POST接收到的消息发送给所有这些请求：

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import javax.servlet.AsyncContext;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@WebServlet(name = "HeartBeatServlet", urlPatterns = {"/HeartBeatServlet"}, asyncSupported = true)
public class HeartBeatServlet extends HttpServlet {

    private List<AsyncContext> asyncContextList = new LinkedList<>();

    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) {
        AsyncContext asyncContext = request.startAsync(request, response);
        asyncContext.setTimeout(30000);
        asyncContextList.add(asyncContext);
    }

    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response) {
        String test = request.getParameter("message");
        List<AsyncContext> asyncContexts = new ArrayList<>(asyncContextList);
        asyncContextList.clear();
        for (AsyncContext asyncContext : asyncContexts) {
            ServletResponse res = asyncContext.getResponse();
            res.setContentType("text/html");
            try {
                PrintWriter out = asyncContext.getResponse().getWriter();
                out.println(test + " <br />");
                out.flush();
                asyncContext.complete();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

import java.io.IOException；
导入java.io.PrintWriter；
导入java.util.ArrayList；
导入java.util.LinkedList；
导入java.util.List；
导入javax.servlet.AsyncContext；
导入javax.servlet.ServletResponse；
导入javax.servlet.annotation.WebServlet；
导入javax.servlet.http.HttpServlet；
导入javax.servlet.http.HttpServletRequest；
导入javax.servlet.http.HttpServletResponse；
@WebServlet（name=“HeartBeatServlet”，urlPatterns={”/HeartBeatServlet”}，asyncSupported=true）
公共类HeartBeatServlet扩展了HttpServlet{
私有列表asyncContextList=新建LinkedList（）；
@凌驾
public void doGet（HttpServletRequest请求、HttpServletResponse响应）{
AsyncContext AsyncContext=request.startAsync（请求，响应）；
asyncContext.setTimeout（30000）；
asyncContextList.add（asyncContext）；
}
@凌驾
public void doPost（HttpServletRequest请求、HttpServletResponse响应）{
字符串测试=request.getParameter（“消息”）；
List asyncContexts=新的ArrayList（asyncContextList）；
asyncContextList.clear（）；
用于（异步上下文异步上下文：异步上下文）{
ServletResponse res=asyncContext.getResponse（）；
res.setContentType（“文本/html”）；
试一试{
PrintWriter out=asyncContext.getResponse（）.getWriter（）；
out.println（测试+“
”）；
out.flush（）；
asyncContext.complete（）；
}捕获（IOE异常）{
e、 printStackTrace（）；
}
}
}
}

我做错什么了吗？谢谢

（代码有多线程问题。请参阅此部分了解如何解决这些问题。）

代码将GET请求的AsyncContext存储在列表中，并在POST上完成GET响应。但是由于超时，GET响应可能已经隐式完成（由servlet容器触发），存储的AsyncContext不会反映这一点。因此，当您检索此存储的AsyncContext并尝试完成GET请求时，servlet容器没有找到需要恢复的挂起的GET请求。因此，非法国家例外

请同时参考间接回答此问题的其他信息