On 07-03-13, at 13:04, Chuck Hill wrote:
On Mar 13, 2007, at 9:56 AM, Jacky Gagnon wrote:
Hi,
I have this very cool exception who will drive me crazy :
"java.lang.IllegalStateException: rowDiffsForAttributes: snapshot
in com.webobjects.eoaccess.EODatabaseOperation {_dbSnapshot =
{}; ..."
The problem happen when I try to edit an object with an assistant :
a) That is not the problem, that is only the symptom of the problem.
b) There is only one cause of this exception, which I proved on
this list a couple of weeks back when it happened to me.
Somewhere, perhaps far away from this, you are doing bad things to
EOF. If you stop doing that, this exception will stop happening.
You are doing something wrong in one or both of these areas:
http://en.wikibooks.org/wiki/Programming:WebObjects/EOF/Using_EOF/
The_EOF_Commandments
http://en.wikibooks.org/wiki/Programming:WebObjects/EOF/Using_EOF/
Context_and_Database_Locking
The first thing I would do is to enable DebugGroupMultithreading
and run your app. Check the log and fix anything it complains about.
Chuck
Thanks! Chuck...
The problem was in my direct action where I tried to lock my nested
EC without calling generateResponse() before unlocking; what I'm
not sure is why the DebugGroupMultithreading didn't alert me (because
it was already enable)?
public WOActionResults startTheAssistant() {
WOComponent pageAssistant = pageWithName("FirstPageForMyAssistant");
WOResponse response;
session().myNestedEC().lock;
try {
...
response = pageAssistant.generateResponse().
} finally {
session().myNestedEC().unlock;
}
return response;
}
- In a direct action I create a session, fetch the object into the
default editing context and I transfert it to a nested editing
context with «localInstanceOfObject» and I go to the first page of
my assistant where the user can edit the object. (I use the
MultiECLockManager to lock my nestedEC).
-In the end, I save my nestedEC and the defaultEC, and I get the
java.lang.IllegalStateException... !
I did a unit test to simulate the edition of the object made by
the assistant, and all run fine.
The problem seem to happen when I go to the next component (direct
action to a regular component?).
My question is, what the best way to diagnose this problem?
Thanks!
Note : I didn't have exception about an object trying to access an
unlocked EC and "EOObjectsChangedInStoreNotification" is only call
when I try to save my changes.
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