Bugs item #705542, was opened at 2003-03-18 12:53
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Category: JBossCMP
Group: v3.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Johan Granlund (johgr814)
Assigned to: Nobody/Anonymous (nobody)
Summary: Errorenous IllegalStateException on CMR-Collection
Initial Comment:
We've been dealing with this bug since we started up
our project with JBoss 3.0.0.
Now we are using JBoss 3.0.2RC2 with Postgres 7.2
and we still get it. When we are using a Collection
retrieved with a CMR-getter on a local interface the
Collection sporadicly maybe 1 of 200 calls thinks it was
created in another transaction that obviously isn't the
case. We get a stacktrace like this:
12:21:38,121 ERROR [LogInterceptor]
RuntimeException:
java.lang.IllegalStateException: The iterator of a CMR
collection may only be used within the transction in
which it was created
at
org.jboss.ejb.plugins.cmp.jdbc.bridge.RelationSet$1.verif
yIteratorIsValid(RelationSet.java:345)
at
org.jboss.ejb.plugins.cmp.jdbc.bridge.RelationSet$1.has
Next(RelationSet.java:298)
at
se.alleato.ejb.alexandria.server.facade.PersonFacadeBe
an.getNodePersonRoles(PersonFacadeBean.java:318)
...
This isn't isolated to any specific bean, instead it occurs
on Collection retrieved by local CMP interfaces that are
called often. It is obvious an errorenous behaviour that
can be worked around by catching the exception and
creating the Collection again by calling the getter again
which works fine but clearly is anoying.
----------------------------------------------------------------------
>Comment By: Johan Granlund (johgr814)
Date: 2003-04-01 09:48
Message:
Logged In: YES
user_id=509036
Yes I'm using pessimistic locking, never got any performance
out of the optimistic.
I pretty sure this is a duplicate bug #634910 and in that report
there is test case.
----------------------------------------------------------------------
Comment By: Alexey Loubyansky (loubyansky)
Date: 2003-03-28 16:17
Message:
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user_id=543482
Are you using pessimistic locking?
I tried to reproduce it but couldn't.
I have a Parent and 1000 of related Child instances. There are
100 concurrent threads that getting parent's children
collection and iterate over it.
This does not fail for me.
If could you provide a testcase that fails even time to time
that would be great.
alex
----------------------------------------------------------------------
Comment By: Johan Granlund (johgr814)
Date: 2003-03-28 11:15
Message:
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user_id=509036
I'm using "Required" transaction setting. The error occurs no
matter what commit option I'm using.
I don't think any special use case is required to reproduce it,
just specify two entity beans A 1-n B. Create one session
bean that fetches the collection a.getBs() and iterate over it.
With some load the error will occur.
----------------------------------------------------------------------
Comment By: Johan Granlund (johgr814)
Date: 2003-03-28 11:06
Message:
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Sorry about that, 3.2.0RC2 it was, and now 3.2.0RC4.
I can also add that the easiest way to reproduce the bug is to
put load on the system, then you can be sure it will happen,
in our case it starts around 15 simultanous users.
To work around the problem I have patched the RelationSet
class. In the constructor I copy the setHandle array to the
member variable instead of assigning it. This makes
everything work fine but clearly isn't the correct way.
----------------------------------------------------------------------
Comment By: Stephen Coy (scoy)
Date: 2003-03-28 10:30
Message:
Logged In: YES
user_id=463096
Are you *really* using JBoss 3.0.2RC2?
Or is it 3.2.0RC2?
Either way, you need to provide more information wrt to the way you are specifying
your transactions and your use cases.
----------------------------------------------------------------------
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