On 21/mar/2013, at 15:25, George Domurot <[email protected]> wrote:
> 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().
No, we never touch session() in the e-mail component.
We create a context because we couldn't figure out how to instantiate a
Component from outside the R-R loop, the mail component is only used to compose
the e-mail….
>
> 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;
> }
> }
Thanks for that,
Matteo
>
> -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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>>>>>
>>>>> --
>>>>> Chuck Hill
>>>>> Executive Managing Partner, VP Development and Technical Services
>>>>>
>>>>> Practical WebObjects - for developers who want to increase their overall
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>>>>> http://www.global-village.net/gvc/practical_webobjects
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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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>>
>>
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