Jersey 2.9.1. It seems to work from a functional point of view, it just
logs a warning all the time. web.xml etc are all set up correctly, if they
weren't then other AsyncResponses wouldn't work.
As far as I can tell, it's because Jersey assumes that a ChunkedOutput is
not returned from an AsyncResponse, it assumes that either you use
AsyncResponse and then return a 'single' entity, or you return
ChunkedOutput synchronously.
On Fri, Jun 27, 2014 at 6:28 PM, Van Klaveren, Brian N. <
bvan_at_slac.stanford.edu> wrote:
> Hi,
>
> What version of jersey/java/OS are you using?
> Can you provide a code snippet?
>
> I had issues with tomcat 7.0.54 on Mac OS X 10.9.3 with 1.7u60, using
> Jersey 2.9. It seems like it did work for me with tomcat 7.0.27 with java
> 1.7.0_41. on the same OS.
>
> At one point, I think I was getting the same exception as you, so I’m
> going to assume that maybe you might be having the same problem as me. I
> wasn’t trying to use ChunkedOutput but I was trying to use EventOutput
> which is a subclass. I can’t remember exactly the error I was getting,
> however.
>
> There’s a Jira about this which may be related, but I’m not sure:
> https://java.net/jira/browse/JERSEY-2270
>
> A couple of things to check or try:
>
> 1. Make sure you have:
> <asyncSupported>true</asyncSupported> in your web.xml under your servlet
> declaration.
>
> 2. Double check tomcat is using NIO. In your server.xml, you should have
> something like this (I don’t think this is a problem):
> <Connector connectionTimeout="20000" port="8080"
> protocol="org.apache.coyote.http11.Http11NioProtocol" redirectPort="8443”/>
>
>
> 3. You could maybe try telling tomcat that async is supported for the
> request before the request is suspended, like in the constructor:
> public ResourceClassConstructor(@Context HttpServletRequest request){
> request.setAttribute( "org.apache.catalina.ASYNC_SUPPORTED", true
> );
> }
>
> Brian
>
> On Jun 27, 2014, at 3:02 AM, Christopher Ng <cng1067_at_gmail.com> wrote:
>
> > It seems that it is currently possible to return a ChunkedOutput with an
> AsyncResponse, but it causes Tomcat to log a warning as Jersey tries to
> suspend the AsyncContext twice.
> >
> > This might seem like a bit of an odd thing to do, but returning
> ChunkedOutput synchronously always immediately returns a 200, whereas I
> would like to be able to choose whether to return a ChunkedOutput or eg a
> 500 at a 'later' point, using AsyncResponse.
> >
> > I get the following warning in Tomcat, but apart from that things seem
> to work as expected:
> >
> > WARNING: Attempt to put servlet request into asynchronous mode has
> failed. Please check your servlet configuration - all Servlet instances and
> Servlet filters involved in the request processing must explicitly declare
> support for asynchronous request processing.
> > java.lang.IllegalStateException: Calling [asyncStart()] is not valid for
> a request with Async state [STARTED]
> > at
> org.apache.coyote.AsyncStateMachine.asyncStart(AsyncStateMachine.java:175)
> > at
> org.apache.coyote.ajp.AbstractAjpProcessor.action(AbstractAjpProcessor.java:453)
> > at org.apache.coyote.Request.action(Request.java:346)
> > at
> org.apache.catalina.core.AsyncContextImpl.setStarted(AsyncContextImpl.java:345)
> > at
> org.apache.catalina.connector.Request.startAsync(Request.java:1665)
> > at
> org.apache.catalina.connector.RequestFacade.startAsync(RequestFacade.java:1029)
> > at
> javax.servlet.ServletRequestWrapper.startAsync(ServletRequestWrapper.java:379)
> > at
> javax.servlet.ServletRequestWrapper.startAsync(ServletRequestWrapper.java:379)
> > at
> org.glassfish.jersey.servlet.async.AsyncContextDelegateProviderImpl$ExtensionImpl.suspend(AsyncContextDelegateProviderImpl.java:87)
> > at
> org.glassfish.jersey.servlet.internal.ResponseWriter.suspend(ResponseWriter.java:121)
> > at
> org.glassfish.jersey.server.ServerRuntime$Responder.writeResponse(ServerRuntime.java:674)
> > at
> org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:375)
> > at
> org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:365)
> > at
> org.glassfish.jersey.server.ServerRuntime$AsyncResponder$3.run(ServerRuntime.java:820)
> > at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
> > at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
> > at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
> > at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
> > at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
> > at
> org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:297)
> > at
> org.glassfish.jersey.server.ServerRuntime$AsyncResponder.resume(ServerRuntime.java:850)
> > at
> org.glassfish.jersey.server.ServerRuntime$AsyncResponder.resume(ServerRuntime.java:812)
>
>