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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: Tomcat Going down Frequently
Date Wed, 17 Nov 2010 16:36:03 GMT
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Pid,

On 11/16/2010 6:24 PM, Pid wrote:
> On 16/11/2010 21:15, Christopher Schultz wrote:
>> 2. There is no way for a client to check the validity of an HttpSession
>> object before calling getAttribute (or setAttribute for that matter)
>>
>> The HttpSession interface javadoc says "For session that are invalidated
>> or expire, notifications are sent after the session has been invalidated
>> or expired." which means that, at least, the state above is correct.
> 
> The class is calling: StandardSessionFacade.getAttributeNames.
> 
> Shouldn't we see the HttpSession class in the stacktrace, not the
> implementation, if that's what they're calling?  Makes me think the OP
> is interacting with Tomcat internal classes.

No, HttpSession is just an interface, so you'll never see it in a stack
trace. Instead, you see the class that implements that interface.

N.B.: the HttpSession documentation says that IllegalStateException will
be thrown when calling getAttributeNames on an invalidated session. I
guess objects such as the LoginBean should expect that the session might
be invalidated, and catch IllegalStateException in those cases.

- -chris
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