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Re: SOLVED: Zombie sessions
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Re: SOLVED: Zombie sessions


  • Subject: Re: SOLVED: Zombie sessions
  • From: Simon McLean <email@hidden>
  • Date: Thu, 23 Oct 2008 08:09:53 +0100

Blimey, this has taken me weeks to figure out...

We've been plagued with zombie sessions for weeks on a couple of production apps. One, for example, is used by a team of 5 people who sign on in the morning and out in the evening, by which time the app is busy running 300+ sessions!

Anyway, after much digging I finally nailed it down to a component that was being used to render email. We use the following method to instantiate a component and then call generateResponse().contentString() to get it's html content:

public static WOComponent instantiatePage(String pageName) {
// Create a context from a fake request
WORequest request = new WORequest("GET", "", "HTTP/1.1", null, null, null);
WOContext context = WOApplication.application().createContextForRequest(request);
return WOApplication.application().pageWithName(pageName, context);
}


The problem was that one of the components used as an email touched the session. I believe because we are using a fake context this results in a new session being created. I'm not sure why those extra sessions don't just expire like normal ones ? But anyway, problem solved. I can sleep again.

They weren't created normally in the RR loop so sleep never got called on them. Like a watched pot never boiling, awake sessions never terminate. :-P


Chuck

Hi Chuck -

Is there any reason why a session would normally sit inactive but awake for a long period of time ?

I wonder if it's something that could / should be recognised and handled by WO ?

Simon
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  • Follow-Ups:
    • Re: SOLVED: Zombie sessions
      • From: Chuck Hill <email@hidden>
References: 
 >SOLVED: Zombie sessions (From: Simon McLean <email@hidden>)
 >Re: SOLVED: Zombie sessions (From: Chuck Hill <email@hidden>)

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