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 <webobje...@altera.it> 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 <si...@potwells.co.uk> 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 <ch...@global-village.net> 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
>> knowledge of WebObjects or who are trying to solve specific problems.
>> http://www.global-village.net/gvc/practical_webobjects
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