环境：
- 在我的环境中，Kibana 4.5.2在"反向代理servlet"后面运行，该"反向代理servlet"是通过扩展Jetty的" Proxyservlet"类创建的。
- 这样做是为了使Kibana Web界面可以使用URL https：//jetty_server_ip：8443/visual-analytics/proxy/...此URL的请求截取是由在Jetty Server中运行的反向代理拦截的请求并将重定向到https：//localhost：5601/...即，到与Jetty Server在同一机器中运行的Kibana服务器。
- 然后，Kibana服务器处理码头服务器转发的请求，并将响应返回到Web浏览器中。
- 注意：码头在我的应用程序中以"嵌入式模式"运行。
问题：
"反向代理servlet"映射到URL/Visual-Analytics/proxy/*"。
还有另一个"过滤器"映射到URL"/visual-analytics/proxy/elasticsearch/.kibana/search/*"其中，其中continuationListener被以下代码snippet所示：
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);
上面的连续列表与 jetty版本8.1.15.v20140411 和侦听器的oncomplete（）方法都可以正常工作。但是，将码头版本升级到 9.3.14.v20161028 之后，continuationListener不再工作，即，侦听器的oncomplete（）方法都不被调用ontimeout（）方法。
由于ContinuationListener不再工作，因此我用以下代码片段指示的" Javax.servlet.asynclistener"实现了它：
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);
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)
" proxyservlet.java"中的行号88，上述堆栈跟踪中提到的是以下代码：
final AsyncContext asyncContext = request.startAsync();
是因为startAsync（）方法在同一请求中被调用两次，这是我的过滤器中的第一次，并且在Jetty Proxyservlet的Service（）方法中第二次被称为" IllegalStateException"？如果是，是否没有办法在由Jetty的ProxyServlet终止的过滤链中使用" rasynclistener"？
关于如何进一步进行的任何指针将不胜感激。期待任何回应...
fyi我修复了以下问题：
- 我不使用Jetty的" ContinuationListener"，而是使用了Servlet 3.0的" Asynclistener"，因为Jetty的" ContinuationListener"似乎在升级到 JETTY 9.3.14.v20161028 之后似乎不起作用。这可能是一个码头错误。
- 侦听器相关的代码段位于过滤器的"链"呼叫之前。我将此代码段移至过滤器的"链" chain.dofilter（）"调用后，以便我可以在Jetty ProxyServlet的Service（）方法中检索已"已创建"的AsyncContext。然后，我可以在检索的Asynconcontext中添加异步。
- 我将过滤器中的" request.startasync（）"更改为" request.getAsyncconconcext（）"，这样我就不会启动一个新的asynccontext，这会导致IllegalStateException，但只能检索已经在Asynccontext中创建的asynccontextJetty的Proxyservlet。
因此，更新的代码段看起来像这样：
chain.doFilter(myRequestWrapper, response);
AsyncContext asyncContext = myRequestWrapper.getAsyncContext();
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);