I've seen this issue before, many years ago too. Where it bit me was where I
touched sessions and contexts in my component without testing to see if I in
fact had either to work with.
You mentioned creating a context for your email. Are you then touching
context.session()? It will lazy load a session. As will component.session().
Search across your project for "session()" and "context()". There's typically a
culprit out there.
Here's a helper we use in our components for accessing a current session, but
only if one already exists. It may be overkill, but at the time it helped
remove our zombie sessions.
public WOSession currentSession()
{
if (hasSession())
{
return session();
}
else if (context() != null)
{
if (context().hasSession())
{
return context().session();
}
else
{
return null;
}
}
else
{
return null;
}
}
-George
On Mar 21, 2013, at 6:47 AM, Altera WO Team <[email protected]> wrote:
> I tried anyway and I can confirm. I'm not creating needless sessions.
>
> The app locks up anyway though…
>
> I lost hope in finding the real reason, for now I would be happy to find a
> dirty workaround. I need those apps to bounce anyway.
>
> I already tried using ERTimeToKill and it's ineffective.
>
> The lockups are quite rare: I have 10 instances running, bouncing every 6
> hours and it happens maybe 2 times a week, but if an instance locks up the
> instances running become 9 and in the long run I'll have everything locked up.
>
> Any suggestions?
>
>
> Matteo
>
>
> On 20/mar/2013, at 01:16, Chuck Hill <[email protected]> wrote:
>
>> I think the problem is not that it is creating needless sessions, but that a
>> checked-out session is not getting checked back in.
>>
>> Chuck
>>
>>
>> On 2013-03-19, at 5:08 PM, Simon wrote:
>>
>>> if we have this kind of issue the first thing we do is log out session
>>> creation and check the stack traces. stick something like this in your
>>> session constructor then check the output:
>>>
>>> public Session() {
>>> super();
>>> StringWriter stringWriter = new StringWriter();
>>>
>>> PrintWriter printWriter = new PrintWriter(stringWriter);
>>>
>>> (new Throwable()).printStackTrace(printWriter);
>>>
>>> String trace = stringWriter.toString(); <---- log this somewhere that you
>>> can get easy access to
>>>
>>> }
>>>
>>>
>>>
>>>
>>>
>>>
>>> On 19 March 2013 23:15, Altera WO Team <[email protected]> wrote:
>>> Wow, good hint!
>>>
>>> In theory I'm not touching a Session but sometimes, when something in an EO
>>> changes I trigger e-mail sending.
>>> I use ERMailDeliveryHTML using a component instantiated with a brand new
>>> wocontext using ERXWOContext.newContext()
>>> the component is not referencing a Session in any part.
>>>
>>> Could it be the cause?
>>>
>>> Matteo
>>>
>>>
>>> On 19/mar/2013, at 21:24, Simon <[email protected]> wrote:
>>>
>>>> ...or you are touching the session object outside the RR loop. the classic
>>>> gotcha is rendering a component in a thread that touches the session in
>>>> some way e.g. delivering an email in a thread that uses a component to
>>>> render it's content... been caught by that one soooo many times!
>>>>
>>>>
>>>> On 19 March 2013 17:51, Chuck Hill <[email protected]> wrote:
>>>> Hi Matteo,
>>>>
>>>> You have one or more Zombie (aka Immortal) Sessions, as shown by stack
>>>> traces like this:
>>>> "WorkerThread11" prio=10 tid=0x0000000041848800 nid=0x1010 in
>>>> Object.wait() [0x00007f16f7cfa000]
>>>> java.lang.Thread.State: WAITING (on object monitor)
>>>> at java.lang.Object.wait(Native Method)
>>>> - waiting on <0x00000000d120b328> (a
>>>> com.webobjects.appserver.WOSessionStore$TimeoutEntry)
>>>> at java.lang.Object.wait(Object.java:485)
>>>> at
>>>> com.webobjects.appserver.WOSessionStore.checkOutSessionWithID(WOSessionStore.java:191)
>>>> - locked <0x00000000d120b328> (a
>>>> com.webobjects.appserver.WOSessionStore$TimeoutEntry)
>>>> at
>>>> com.webobjects.appserver.WOApplication.restoreSessionWithID(WOApplication.java:1913)
>>>> at
>>>> er.extensions.appserver.ERXApplication.restoreSessionWithID(ERXApplication.java:2403)
>>>> at
>>>> er.extensions.appserver.ERXWOContext.existingSession(ERXWOContext.java:57)
>>>> at
>>>> er.extensions.appserver.ERXWOContext.hasSession(ERXWOContext.java:69)
>>>> at
>>>> com.webobjects.appserver.WOAction.existingSession(WOAction.java:190)
>>>> at com.tla.calendar.DirectAction.goToAction(DirectAction.java:454)
>>>>
>>>>
>>>> This likely has one of two causes:
>>>> 1. The application is getting OutOfMemory errors, which can leave the
>>>> session store in an insane state
>>>> 2. The app is throwing an exception from sleep() in Session. If you
>>>> overrride sleep() it should use a try...finally block
>>>>
>>>> public void sleep() {
>>>> try {
>>>> // Your code here!
>>>> } finally {
>>>> super.sleep();
>>>> }
>>>> }
>>>>
>>>>
>>>> Chuck
>>>>
>>>>
>>>>
>>>> On 2013-03-19, at 9:38 AM, Altera WO Team wrote:
>>>>
>>>>> Hi all,
>>>>>
>>>>> I'm having a strange issue on a WO installation on EC2 (oracle jvm).
>>>>> Same strange application which had immortal sessions…
>>>>>
>>>>> Sometimes (quite rarely) a bounced application (put in refuse new
>>>>> sessions) never quits and it's not accessible from JavaMonitor.
>>>>> If I look at the logs i see:
>>>>>
>>>>> Mar 19 12:38:52 B2C[2002] (ERXNSLogLog4jBridge.java:44) WARN NSLog -
>>>>> <com.tla.calendar.Application>: refusing new clients and below min active
>>>>> session threshold
>>>>> Mar 19 12:38:52 B2C[2002] (ERXNSLogLog4jBridge.java:44) WARN NSLog -
>>>>> <com.tla.calendar.Application>: about to terminate...
>>>>>
>>>>> The only thing left is to kill the instance… Which is not nice.
>>>>>
>>>>> I'm not overriding the terminate() method in Application.
>>>>>
>>>>> I am attaching a stack trace if it helps.
>>>>> <B2Cjstack.txt>
>>>>>
>>>>> Thanks,
>>>>>
>>>>>
>>>>>
>>>>> Matteo Centro
>>>>> _______________________________________________
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>>>>>
>>>>> This email sent to [email protected]
>>>>
>>>> --
>>>> Chuck Hill
>>>> Executive Managing Partner, VP Development and Technical Services
>>>>
>>>> Practical WebObjects - for developers who want to increase their overall
>>>> knowledge of WebObjects or who are trying to solve specific problems.
>>>> http://www.global-village.net/gvc/practical_webobjects
>>>>
>>>> Global Village Consulting ranks 13th in 2012 in BIV's Top 100 Fastest
>>>> Growing Companies in B.C!
>>>> Global Village Consulting ranks 76th in 24th annual PROFIT 200 ranking of
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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>>>>
>>>
>>>
>>
>> --
>> Chuck Hill
>> Executive Managing Partner, VP Development and Technical Services
>>
>> Practical WebObjects - for developers who want to increase their overall
>> knowledge of WebObjects or who are trying to solve specific problems.
>> http://www.global-village.net/gvc/practical_webobjects
>>
>> Global Village Consulting ranks 13th in 2012 in BIV's Top 100 Fastest
>> Growing Companies in B.C!
>> Global Village Consulting ranks 76th in 24th annual PROFIT 200 ranking of
>> Canada’s Fastest-Growing Companies by PROFIT Magazine!
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
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