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环境：上的servlet请求调用startAsync（）抛出IllegalStateException异常由码头9的ProxyServlet的终止的过滤器链
- 在我的环境，Kibana 4.5.2运行后面“反向代理servlet”，其是通过扩展Jetty的“ProxyServlet”类创建的。
- 这样做是为了使用URL https://Jetty_Server_IP:8443/visual-analytics/proxy/ ...可以访问Kibana网页界面。该URL的请求被在Jetty服务器中运行的反向代理拦截，并被重定向到https://localhost:5601/ ...即，到Kibana服务器与Jetty服务器在同一台机器上运行。
- Kibana服务器然后处理由Jetty服务器转发的请求并将响应返回给Web浏览器。
- 注意： Jetty在我的应用程序中以“嵌入模式”运行。
问题：
“反向代理servlet” 被映射到URL “/视觉分析/代理/ *”。
有被映射到其中由下面的代码段所指示正在使用ContinuationListener的URL“/visual-analytics/proxy/elasticsearch/.kibana/search/*”另一个“过滤器”：
ContinuationSupport.getContinuation(myRequestWrapper).addContinuationListener(new ContinuationListener() {
@Override
public void onTimeout(Continuation continuation) {
logger.log(Level.WARNING, "Request timeout...");
}
@Override
public void onComplete(Continuation continuation) {
HttpServletResponse httpResponse = (HttpServletResponse)continuation.getServletResponse();
if (httpResponse.getStatus() == HttpServletResponse.SC_OK || httpResponse.getStatus() == HttpServletResponse.SC_CREATED) {
//some business logic
}
}
});
chain.doFilter(myRequestWrapper, response);
以上ContinuationListener工作正常与码头版本8.1.15.v20140411与收听者的onComplete（）方法被调用。但是在将Jetty版本升级到9.3.14.v20161028后，ContinuationListener不再工作，即既没有调用监听器的onComplete（）方法也没有调用onTimeout（）方法。
由于ContinuationListener不再工作，我用“javax.servlet.AsyncListener”的实施方案替换其通过下面的代码片段所示：
AsyncContext asyncContext = myRequestWrapper.startAsync();
asyncContext.addListener(new AsyncListener() {
@Override
public void onTimeout(AsyncEvent event) throws IOException
{
logger.log(Level.WARNING, "Async timeout...");
}
@Override
public void onStartAsync(AsyncEvent event) throws IOException
{
logger.log(Level.INFO, "Async start...");
}
@Override
public void onError(AsyncEvent event) throws IOException
{
logger.log(Level.SEVERE, "Async error...");
}
@Override
public void onComplete(AsyncEvent event) throws IOException
{
HttpServletResponse httpResponse = (HttpServletResponse) event.getSuppliedResponse();
//HttpServletResponse httpResponse = (HttpServletResponse) event.getAsyncContext().getResponse();
if (httpResponse.getStatus() == HttpServletResponse.SC_OK || httpResponse.getStatus() == HttpServletResponse.SC_CREATED) {
//some business logic
}
}
}, myRequestWrapper, httpServletResponse);
chain.doFilter(myRequestWrapper, response);
但加入上述“AsyncListener”的实施导致这是在上述第一提到
https://164.99.175.139:8443/visual-analytics/proxy/elasticsearch/.kibana/search/test1?op_type=create java.lang.IllegalStateException: s=DISPATCHED i=true a=STARTED at org.eclipse.jetty.server.HttpChannelState.startAsync(HttpChannelState.java:264) at org.eclipse.jetty.server.Request.startAsync(Request.java:2235) at javax.servlet.ServletRequestWrapper.startAsync(ServletRequestWrapper.java:432) at javax.servlet.ServletRequestWrapper.startAsync(ServletRequestWrapper.java:432) at javax.servlet.ServletRequestWrapper.startAsync(ServletRequestWrapper.java:432) at org.eclipse.jetty.proxy.ProxyServlet.service(ProxyServlet.java:88) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:845) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1712) at com.netiq.sentinel.kibana.search.KibanaSearchFilter.doFilter(KibanaSearchFilter.java:249) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1699) at com.netiq.sentinel.kibana.proxy.AcceptEncodingHeaderModificationFilter.doFilter(AcceptEncodingHeaderModificationFilter.java:37) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1699) at com.netiq.sentinel.kibana.proxy.SecurityFilter.doFilter(SecurityFilter.java:41) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1699) at com.netiq.sentinel.kibana.proxy.AuditFilter.doFilter(AuditFilter.java:104) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1699) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) at org.eclipse.jetty.server.Server.handle(Server.java:534) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95) at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:202) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95) at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93) at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303) at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148) at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671) at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589) at java.lang.Thread.run(Thread.java:745)
行号88在 “ProxyServlet.java”：下面的 “IllegalStateException异常” ACK跟踪具有下面的代码：
final AsyncContext asyncContext = request.startAsync();
就是“IllegalStateException异常”被抛出，因为startAsync（）方法正在对同一请求调用两次 - 在我的过滤器首次在码头第二次ProxyServlet的service（）方法？如果是，是否没有办法在由Jetty的ProxyServlet终止的过滤器链中使用“AsyncListener”？
任何关于如何进一步进一步指针将不胜感激。期待任何回应...