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Re: Objects don't get initialized sometimes
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Re: Objects don't get initialized sometimes


  • Subject: Re: Objects don't get initialized sometimes
  • From: Chuck Hill <email@hidden>
  • Date: Tue, 12 Jan 2010 10:07:49 -0800


On Jan 11, 2010, at 2:14 PM, Gennady Kushnir wrote:

I am on MySQL 5.0.x
I don't use change notification framework.
Stack trace of exception says it is raised during ec.saveChanges().

May it be caused by using nested editing contexts?

Maybe if you are using them incorrectly.


Unfortunately I have no idea how to isolate a problem. I can not even
reproduce it.
Myself I have only seen it once "in action". Mostly I can only see it
in logs. And I can't afford to limit functionality of a working
system.
Furthermore I assume it is in the most actively employed part of a
system. As most errors take place there. But maybe it is only because
the majority of saves are performed there...

Maybe I could diagnose the problem injecting some testing somewhere?
Maybe in editingContext subclass?

I'd start by taking a careful look at the full exception stack traces to see if you can isolate where this is happening and then go back and very carefully review that code.


After that, you would need to start disassembling the Java to see where things go wrong and try and get some information logged out. That may require replacing parts of EOF. This is far easier with Wonder but it is still not easy. I have had the most success by carefully looking at the code after looking at the stack traces.


Chuck




2010/1/11 Kieran Kelleher <email@hidden>:

On Jan 11, 2010, at 1:59 PM, Chuck Hill wrote:

On Jan 11, 2010, at 10:33 AM, Kieran Kelleher wrote:

On Jan 11, 2010, at 1:03 PM, Chuck Hill wrote:

On Jan 11, 2010, at 4:26 AM, Gennady Kushnir wrote:

Hello again.
I've got it that I was doing something wrong. I've found and removed
several commandments violations, employed MultiECLockManager for
properly locking everything... but I am still getting these errors!
How could I track where is that violation hidden within over 5000 rows
of code?

There are many, many ways in which things can be done wrong. I don't
know of any easy way to find the source. If you can isolate and reproduce
the problem in a minimum set of steps, that will reduce the amount of code
you have to look at.



These errors raise without any visible dependencies.
Users report that even when system says that it could not save
something (because of that strange error), actually data is saved and
can be reviewed after logging out and in again.

Something else is happening in your code then. Perhaps this is not from
a save? Nothing should get written to the database if this happens during a
saveChanges. Maybe this is happening in your app just after saveChanges()?

Hmmm ....... half-saving transactions is a common problem when you don't
use a transactional database and no "transaction rollback" is available when
ec fails during a save. What database engine are you using?


Now who would use a squirrelly mock database like that?!!?


Someone who acquires a Ferrari and drives it in first gear because they have
never used a "stick-shift" car before! :-P




:-P

Chuck

--
Chuck Hill             Senior Consultant / VP Development

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/products/practical_webobjects











-- Chuck Hill Senior Consultant / VP Development

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/products/practical_webobjects








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  • Follow-Ups:
    • Re: Objects don't get initialized sometimes
      • From: Gennady Kushnir <email@hidden>
References: 
 >Re: Objects don't get initialized sometimes (From: Gennady Kushnir <email@hidden>)
 >Re: Objects don't get initialized sometimes (From: Chuck Hill <email@hidden>)
 >Re: Objects don't get initialized sometimes (From: Kieran Kelleher <email@hidden>)
 >Re: Objects don't get initialized sometimes (From: Chuck Hill <email@hidden>)
 >Re: Objects don't get initialized sometimes (From: Kieran Kelleher <email@hidden>)
 >Re: Objects don't get initialized sometimes (From: Gennady Kushnir <email@hidden>)

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