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From Bob DeRemer <bob.dere...@thingworx.com>
Subject RE: websocket connection (at startup) between 2 webapps in same Tomcat 7.0.47 instance hangs indefinitely
Date Sat, 19 Oct 2013 13:26:26 GMT


> -----Original Message-----
> From: Niki Dokovski [mailto:nickytd@gmail.com]
> Sent: Saturday, October 19, 2013 9:24 AM
> To: Tomcat Developers List
> Subject: Re: websocket connection (at startup) between 2 webapps in same
> Tomcat 7.0.47 instance hangs indefinitely
> 
> On Sat, Oct 19, 2013 at 4:20 PM, Niki Dokovski <nickytd@gmail.com> wrote:
> 
> >
> >
> >
> > On Sat, Oct 19, 2013 at 12:09 AM, Bob DeRemer
> <bob.deremer@thingworx.com>wrote:
> >
> >>  Hi Guys,****
> >>
> >> ** **
> >>
> >> In our implementation, we have a gateway app that uses jsr websockets
> >> to communication with our main application server.  In a small
> >> system, we want to run them both on a single Tomcat instance using
> >> the same Tomcat NIO connector, but directing to different respective
> >> WS paths.  This works fine if you deploy the MAIN first, then the GW
> >> - so that MAIN is already up and running.  If you restart Tomcat when
> >> both webapps are deployed - and the GW
> >> (client) starts first, it hangs indefinitely in the following code
> >> trying to establish a WS connection:
> >>
> >
> > Hi Bob,
> > Do you use the latest implementation? In your case, if got it
> > correctly, we have following:
> >

This was with the latest TAGGED code (7.0.47), not trunk.  If this was a known issue that's
fixed in TRUNK, let me know and I'll test it out. 

Thx - bob


> 

> 
> >  1. a socket listening - Hence connections are processed
> >
>      2. missing application - Hence 404 Not Found status code is expected I
> expect to have 404 response code on initial upgrade request
> 
> cheers
> Niki
> 
> 
> (sorry for previous partial response, hit send by mistake)
> 
> 
> > ****
> >>
> >> ** **
> >>
> >> Is this a bug or a known limitation when a client/server in the same
> >> webapp try to connect at startup?****
> >>
> >> ** **
> >>
> >> Thanks****
> >>
> >> ** **
> >>
> >> "localhost-startStop-1" daemon prio=6 tid=0x000000000ef0f800
> >> nid=0x1624 waiting on condition [0x000000001046e000]****
> >>
> >>    java.lang.Thread.State: WAITING (parking)****
> >>
> >>        at sun.misc.Unsafe.park(Native Method)****
> >>
> >>        - parking to wait for  <0x00000007d6d98b18> (a
> >> java.util.concurrent.CountDownLatch$Sync)****
> >>
> >>        at
> >> java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)****
> >>
> >>        at
> >> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInt
> >> errupt(AbstractQueuedSynchronizer.java:834)
> >> ****
> >>
> >>        at
> >> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared
> >> Interruptibly(AbstractQueuedSynchronizer.java:994)
> >> ****
> >>
> >>        at
> >> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedIn
> >> terruptibly(AbstractQueuedSynchronizer.java:1303)
> >> ****
> >>
> >>        at
> >> java.util.concurrent.CountDownLatch.await(CountDownLatch.java:236)***
> >> *
> >>
> >>        at sun.nio.ch.PendingFuture.get(PendingFuture.java:180)****
> >>
> >>        at
> >>
> org.apache.tomcat.websocket.WsWebSocketContainer.processResponse(WsWe
> >> bSocketContainer.java:568)
> >> ****
> >>
> >>        at
> >>
> org.apache.tomcat.websocket.WsWebSocketContainer.connectToServer(WsWe
> >> bSocketContainer.java:317)
> >> ****
> >>
> >>        at
> >> com.thingworx.core.communication.channels.jsr356.client.Jsr356ClientC
> >> hannel.connect(Jsr356ClientChannel.java:57)
> >> ****
> >>
> >>        at
> >>
> com.thingworx.core.communication.endpoints.CommunicationEndpoint.conn
> >> ect(CommunicationEndpoint.java:186)
> >> ****
> >>
> >>        at
> >> com.thingworx.core.communication.CommunicationSubsystem.startSubsyste
> >> m(CommunicationSubsystem.java:88)
> >> ****
> >>
> >>        at
> >> com.thingworx.core.subsystems.SubsystemBase.start(SubsystemBase.java:
> >> 48)*
> >> ***
> >>
> >>        at
> >> com.thingworx.apiserver.APIServerManager.startSubsystem(APIServerMana
> >> ger.java:92)
> >> ****
> >>
> >>        at
> >> com.thingworx.core.subsystems.SubsystemBase.start(SubsystemBase.java:
> >> 48)*
> >> ***
> >>
> >>        at
> >> com.thingworx.apiserver.Bootstrapper.contextInitialized(Bootstrapper.
> >> java:57)
> >> ****
> >>
> >>        at
> >> org.apache.catalina.core.StandardContext.listenerStart(StandardContex
> >> t.java:4939)
> >> ****
> >>
> >>        at
> >> org.apache.catalina.core.StandardContext.startInternal(StandardContex
> >> t.java:5434)
> >> ****
> >>
> >>        - locked <0x00000007da3e0308> (a
> >> org.apache.catalina.core.StandardContext)****
> >>
> >>        at
> >> org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)*
> >> ***
> >>
> >>        - locked <0x00000007da3e0308> (a
> >> org.apache.catalina.core.StandardContext)****
> >>
> >>        at
> >> org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.
> >> java:1559)
> >> ****
> >>
> >>        at
> >> org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.
> >> java:1549)
> >> ****
> >>
> >>        at
> >> java.util.concurrent.FutureTask.run(FutureTask.java:262)****
> >>
> >>        at
> >> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.
> >> java:1145)
> >> ****
> >>
> >>        at
> >> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
> >> .java:615)
> >> ****
> >>
> >>        at java.lang.Thread.run(Thread.java:744)****
> >>
> >> ** **
> >>
> >>    Locked ownable synchronizers:****
> >>
> >>        - <0x00000007da3a7ab0> (a
> >> java.util.concurrent.ThreadPoolExecutor$Worker)****
> >>
> >> ** **
> >>
> >> ** **
> >>
> >> ** **
> >>
> >> *Bob DeRemer*
> >>
> >> *Senior Director, Architecture and Development*
> >>
> >> ** **
> >>
> >> [image: Description: Description: Description: Description:
> >> cid:image001.png@01CBE3DE.51A12030]****
> >>
> >> http://www.thingworx.com****
> >>
> >> Skype: bob.deremer.thingworx****
> >>
> >> O: 610.594.6200 x812****
> >>
> >> M: 717.881.3986****
> >>
> >> ** **
> >>
> >
> >

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