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From Joe Baldwin <>
Subject Re: Odd error
Date Wed, 08 Feb 2012 18:37:24 GMT
Problem Statement: Seemingly misleading FK exception from MySQL on production server
Repeatability: 100% on the production server, 0% on the dev server
Status:  It appears the theory of multiple universes could be part of the solution set :)

****** New Test:
1. After setting Cayenne logging to DEBUG (in the last test) => the FK error disappeared
mysteriously (leaving me nonplused)
2. So I resorted to hacking.  
3. Since I had initially duplicated the Database via a MySQL dump, I decided to do it a different
	a. I saved the Cayenne generated DB struct to a sql file and ran it.
	b. I saved the Database data to a separate sql file an ran it.
	c. I deleted all the cache files (that I could find)
	d. I commented out the Cayenne logging directive
	d. I restarted tomcat
4. Results: The FK problem has not occurred after 5 tests.

Does anyone have a clue as to what happened here, or should I just pour myself a beer a call
it "done". :)  My current (unsubstantiated) theory is the the Cayenne logging directive somehow
"cleared the drains", but I am unsatisfied with this "work boot" theory.

Thanks for all the patient comments.

On Feb 8, 2012, at 12:14 PM, Durchholz, Joachim wrote:

>> One thing you can do is to insert the P6Spy database driver into your app
>> -- this jdbc driver wrapper will provide logging at the jdbc level, which
>> would let you see what's going on without having to enable java logging.
> To see what part of the application is issuing the request, you could take the sources
(available from ) and insert
logging of stack traces. That should at least point you in the direction what's responsible.
> There's actually (commented-out) code for that in com/p6spy/engine/common/
> Maybe do that only if the statement is the one that shouldn't happen so you don't get
huge logs.
> Jo

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