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From "Lobb, Janos" <janos.l...@yale.edu>
Subject Re: java.lang.IllegalStateException Question
Date Thu, 22 Mar 2012 20:06:47 GMT

On Mar 22, 2012, at 11:31 AM, Pid wrote:

> On 22/03/2012 17:05, André Warnier wrote:
>> Pid wrote:
>>> On 22/03/2012 15:47, Lobb, Janos wrote:
>>>> On Mar 22, 2012, at 7:40 AM, André Warnier wrote:
>>>> 
>>>>> Martin Gainty wrote:
>>>>>> Mitch
>>>>>> One possible cause
>>>>>> FE Application creates session
>>>>>> passes queryString or posted Data (hopefully in Sesion) to backend
>>>>>> Axis WebService
>>>>>> Objects are serialized to disk with existing JSESSIONID
>>>>>> FE times out
>>>>>> back end responds to a disconnected session and tries to re-create
>>>>>> session with old JSESSIONID
>>>>>> Illegal StateException is thrown when client tries to (re)create
>>>>>> new session with old serialized JSESSIONID
>>>>> +1
>>>>> I would add that the "illegal state" indicated by the error message
>>>>> is a special tomcat quantum state, resulting from a situation in
>>>>> which the response, while not being totally sent yet, is in fact
>>>>> partially sent already, causing a certain amount of probabilistic
>>>>> confusion a the level of the event horizon.
>>>>> This is caught by a hidden class in Tomcat, invoking a singleton
>>>>> object which writes a generally nonsensical message in one of the
>>>>> logs, chosen at random.
>>>>> Due to the nature of the error, it is of course extremely hard to
>>>>> reproduce, as one can find out either the exact time of the event,
>>>>> or its location, but not both.
>>>>> 
>>>> Even if it is an "illegal state" it still should be either "clean" or
>>>> "mixed".  If clean, then Integrate(fn*(q,p)<illegal state>fn(q,p)dpdq
>>>> should give the exact probability and if it is in "mixed" then the
>>>> diagonal fnm density matrix elements should do similarly.  Of course
>>>> if it is at the event horizon, then all bets are off, because there
>>>> is still now good theory combining quantum states with gravity :-)
>>> 
>>> All of this is irrelevant if the OP is not using the
>>> Http11QuantumConnector.
>>> 
>> 
>> He did not give us details of his configuration, so Janos and I were
>> talking in all generality.
>> 
>> Is the Http11QuantumConnector (finally) released ? 
> 
> I can't tell if it's in trunk or not.  I can look, but I can't check it
> out.  If I check it out, it's often not actually usable because the
> initInternal() method causes it to change state.
> 
> 
> 
> p
> 
>> The last time I
>> tested it, it was starting threads in random parallel universes, which
>> made it hard to collect the results and clean up afterward (and never
>> mind finding the logs).  Granted, heap memory was not an issue anymore,
>> but still I would not call this production-level code.
>> 
>> I think what we really need is a network trace. But a simple
>> back-of-the-hand calculation shows that to determine the precise cause
>> with a 3-sigma level of certainty, we would need a network trace
>> covering at least 7 X 10 exp 24 seconds, which unfortunately exceeds the
>> current high estimate of the age of the Universe by several magnitudes. 
>> The same calculation shows that Konstantin's earlier explanation has a
>> 99.87% probability of being closer to the truth.  So before setting up
>> the network trace, we would recommend to the OP to check Konstantin's
>> hypothesis, just in case.

Just a note to André.  I think Bell already closed out the "hidden class" case, minimum the
local one, the one built into Tomcat.  So nonsensicality must be an "out from this world"
experience.


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