Hello,
I’m seeing very occasional stack traces from the wild that start like this:
java.lang.IllegalStateException: Attempt to access an EO that has either not
been inserted into any EOEditingContext or its EOEditingContext has already
been disposed
at
com.webobjects.eocontrol.EOCustomObject.willRead(EOCustomObject.java:1158)
at
com.webobjects.eocontrol._EOMutableKnownKeyDictionary$Initializer$_GenericRecordBinding.valueInObject(_EOMutableKnownKeyDictionary.java:570)
at
com.webobjects.eocontrol.EOCustomObject.storedValueForKey(EOCustomObject.java:1634)
at net.logicsquad.relief.model._Job.jobDate(_Job.java:124)
at net.logicsquad.relief.model.Job.isMultiDay(Job.java:831)
at sun.reflect.GeneratedMethodAccessor66.invoke(Unknown Source)
Job.isMultiDay() there is being called in the generation of a page
component—it’s the predicate of a conditional in the template. Let me just walk
through what happens:
1. A bunch of users will receive a direct action URL (by some non-browser
channel, say an email).
2. Some or all of those users will hit the URL where:
* A new EC is created with ERXEC.newEditingContext().
* A Job is fetched using a key from the URL: job = Job.fetchRequiredJob(ec,
Job.CODE.is(code)).
* A page is created using pageWithName(), the Job just fetched is set in
that page.
* As above, there’s a conditional in the template that calls
Job.isMultiDay().
3. The page is returned to the browser.
Now, this is by no means a massive application, but there’s some modest
concurrency during the process above: multiple users will hit that DA,
potentially changing and saving properties of the Job, and it’s not at all
inconceivable that the creator of the original Job object will change her mind
and even delete it at any point during the process. Just to make things
super-interesting, we’re also running ERJGroupsSynchronizer across several
instances.
So… what are the possibilities here? Given we create an EC per request, and
fetch the Job straight into it, under what circumstances can that error message
be true?
--
Paul Hoadley
http://logicsquad.net/
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