Re: [enhydra] restart application in EnhydraMultiserver programmatically?

["Michael Strapp" <mstrapp@xxxxxxxxxxxxx>]

Hi Petr,
   We actually use that exact technique here to do restarts nightly on our 
build server (which is running Enhydra 5.1 on Linux), and after a little 
more than a week our application starts encountering 
java.lang.OutOfMemoryError's - indicative of a memory leak (e.g. continually 
adding new objects to a static cache variable).  I investigated this quite a 
while back and confirmed that the memory leak also happens (with what seemed 
to be the same severity) with other applications - even the example Welcome 
application included with Enhydra.  I tried running the multiserver under a 
Java profiler (on Windows XP) and repeatedly restarted the Welcome app - I 
saw the available memory go up and down, but each time it went up it went up 
to a slightly lower level.  Unfortunately, the profiler didn't seem to 
indicate the source of the memory leak - nothing particularly stood out in 
the various counts of instantiated objects.  My only guess at the time was 
that since the classloader was reloading certain classes every time Enhydra 
reinitialized the Welcome app, maybe it wasn't releasing the memory 
associated with the old version (which might not contribute towards a count 
of any instantiated objects).  In any case, since was only happening for our 
build server, we just manually kill and restart the multiserver whenever it 
becomes a problem.

   So, since we're on the topic, I figured I may as well ask - has anyone 
encountered this before?  Does anyone know if Enhydra 5.4 or Enhydra 6.x 
would have the same issue?  Any ideas where the memory leak might really be?

Just wondering...
Mike

----- Original Message ----- 
From: "Petr Stehlik" <pstehlik@xxxxxxxxxx>
To: <enhydra@xxxxxxxxxxxxx>
Sent: Tuesday, January 24, 2006 6:59 AM
Subject: Re: [enhydra] restart application in EnhydraMultiserver 
programmatically?


Slobodan Vujasinovic píše v St 18. 01. 2006 v 16:23 +0100:
> Hi,
>
> try with (wget based example):
>
> for windows:
> wget --http-user=admin --http-password=enhydra
> "http://localhost:8001/Perform.po?action=start&id=Poker"; -o null
>
> for linux:
> wget --http-user=admin --http-password=enhydra
> "http://localhost:8001/Perform.po?action=stop&id=Poker"; -o /dev/null
>
> NOTE:
> 1. 8001 is connector port of Multiserver Admin application
> 1. Example starts(windows)/stops (linux) 'Poker' demo application
> 2. admin/enhydra (username/password) - default authentication parameters
> are used

So far correct but another GET must be invoked to stop a servlet in use:

wget --http-user=admin --http-password=enhydra 
"http://localhost:8001/Perform.po?action=confirmed&id=Poker"; -o /dev/null

Petr