java - 在长轮询的情况下， Atmosphere 框架会在服务器上抛出错误

Question

我想在我的应用程序中实现一个简单的推送机制。我正在使用 TomEE 1.7 服务器，它使用 Tomcat 以及其他一些软件包。

对于Atmosphere，我使用atmosphere-runtime 2.4.3，在客户端我使用2.3.1版本。

现在，当我尝试使用 websockets 进行推送时，一切对我来说都很好，但是当我尝试使用长轮询作为传输时，我在服务器上收到以下错误:

    WARNING: Duplicate resource be43d07f-cbb4-412e-9d50-2d047a2e0223. Could be caused by a dead connection not detected by your server. Replacing the old one with the fresh one
browser connected be43d07f-cbb4-412e-9d50-2d047a2e0223
Mar 10, 2016 11:56:36 AM org.atmosphere.cpr.AtmosphereFramework doCometSupport
SEVERE: AtmosphereFramework exception
java.lang.IllegalStateException: A filter or servlet of the current chain does not support asynchronous operations.
    at org.apache.catalina.connector.Request.startAsync(Request.java:1658)
    at org.apache.catalina.connector.RequestFacade.startAsync(RequestFacade.java:1029)
    at org.atmosphere.cpr.AtmosphereRequestImpl.startAsync(AtmosphereRequestImpl.java:623)
    at org.atmosphere.container.Servlet30CometSupport.suspend(Servlet30CometSupport.java:95)
    at org.atmosphere.container.Servlet30CometSupport.service(Servlet30CometSupport.java:70)
    at org.atmosphere.cpr.AtmosphereFramework.doCometSupport(AtmosphereFramework.java:2287)
    at org.atmosphere.cpr.AtmosphereServlet.doPost(AtmosphereServlet.java:191)
    at org.atmosphere.cpr.AtmosphereServlet.doGet(AtmosphereServlet.java:177)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.filters.CorsFilter.handleSimpleCORS(CorsFilter.java:302)
    at org.apache.catalina.filters.CorsFilter.doFilter(CorsFilter.java:166)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:44)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at com.tradeweb.server.tools.valve.RequestHeaderCopyValve.invoke(RequestHeaderCopyValve.java:41)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

在客户端上我看到以下问题(如果是 Chrome):

 GET http://127.0.0.1:43859/report-integrator-war/notification?X-Atmosphere-trac…ype=text%2Fplain%3B%20charset%3Dutf-8&X-atmo-protocol=true&_=1457628996834 net::ERR_INCOMPLETE_CHUNKED_ENCODING
 _executeRequest @ atmosphere.js:2123
 _reconnect @ atmosphere.js:2232
 ajaxRequest.onreadystatechange @ atmosphere.js:2106
    atmosphere.js:3258 Thu Mar 10 2016 11:56:36 GMT-0500 (Eastern Standard Time) Atmosphere: ajaxRequest.onreadystatechange, new state: 4
    atmosphere.js:3258 Thu Mar 10 2016 11:56:36 GMT-0500 (Eastern Standard Time) Atmosphere: Firing onError, reasonPhrase: maxReconnectOnClose reached
    atmosphere.js:3258 Thu Mar 10 2016 11:56:36 GMT-0500 (Eastern Standard Time) Atmosphere: Firing onError, reasonPhrase: maxReconnectOnClose reached
    atmosphere.js:3258 Thu Mar 10 2016 11:56:36 GMT-0500 (Eastern Standard Time) Atmosphere: ajaxrequest.onerror

这是我的 web.xml :

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    version="3.0">
    <display-name>Portfolio Analytics Integrator</display-name>
    <servlet>
        <servlet-name>AtmosphereServlet</servlet-name>
        <servlet-class>org.atmosphere.cpr.AtmosphereServlet</servlet-class>
        <load-on-startup>0</load-on-startup>
        <async-supported>true</async-supported>
    </servlet>
    <servlet-mapping>
        <servlet-name>AtmosphereServlet</servlet-name>
        <url-pattern>/notification/*</url-pattern>
    </servlet-mapping>
</web-app>

在这里我们可以看到我使用 = true 仍然服务器提示 servlet 不支持异步操作。

我对 Atmosphere 比较陌生，所以无法了解这里的问题是什么。此外，当我在本地运行代码时，至少我可以通过 websockets 进行通信，但是当我在服务器环境中部署代码时，也无法使用 websockets 连接并回退到长轮询，从而产生上述错误。当我在中间使用 charles 代理时，我的本地也会发生同样的情况。

Answer 1

我已经解决了这个问题，看起来这是一个 TomEE 1.7.0 服务器错误。 使用的 TomEE 服务器正在运行 tomcat 7.0.55.0。以下是 TomEE 的 version.sh 输出:

 [web@DEVTWDLNX05 bin]$ ./version.sh
Using CATALINA_BASE:   /home/web/servers/apache-tomee-plus
Using CATALINA_HOME:   /home/web/servers/apache-tomee-plus
Using CATALINA_TMPDIR: /home/web/servers/apache-tomee-plus/temp
Using JRE_HOME:        /usr
Using CLASSPATH:       /home/web/servers/apache-tomee-plus/bin/bootstrap.jar:/home/web/servers/apache-tomee-plus/bin/tomcat-juli.jar
Server version: Apache Tomcat/7.0.55
Server built:   Jul 18 2014 05:34:04
Server number:  7.0.55.0
OS Name:        Linux
OS Version:     3.8.13-55.1.6.el7uek.x86_64
Architecture:   amd64
JVM Version:    1.7.0_75-mockbuild_2015_01_20_15_59-b00
JVM Vendor:     Oracle Corporation

当我在运行 Tomcat 7.0.68 的 TomEE 1.7.4 上运行代码时，一切运行正常。

令人费解的一点是，我还在普通 Tomcat 7.0.55.0 上运行了相同的代码，代码工作得很好，但是当同一个 tomcat 与 TomEE 服务器打包时，我们收到了错误。