Unloaded entities returned in low memory conditions
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Key: JBAS-1664
URL: http://jira.jboss.com/jira/browse/JBAS-1664
Project: JBoss Application Server
Type: Bug
Components: EJBs
Versions: JBossAS-3.2.6 Final
Reporter: Arto Huusko
In low memory conditions (that is, when OutOfMemoryExceptions are seen
frequently all over the place), JBoss can behave wrong in a way that is
critically wrong.
I have seen on several occasions that a finder returns an entity with the
correct identity, but where ejbLoad() has either not been called at all, or
where ejbLoad() has failed at some point (I have no way of knowing which is the
case).
I have observed this behaviour only with BMP beans (and so there is a
possibility that I am doing something wrong in the BMP code, but I doubt this).
However, the fact that I haven't seen this with CMP beans may be just because
CMP beans work differently, or just plain luck. When this occurs, the wrong
behaviour can be seen because the instance variables of the entity bean contain
what ever they had when the entity instance was previously attached to some
other identity.
For example, I may store the primary key of the entity in some instance
variable. Let's say I can access the primary key via method "Long
getMyPrimaryKey()". If the finder returns an entity with the correct identity
(what I asked for in the finder call), but where ejbLoad() is not called or it
fails, then
entity.getMyPrimaryKey().equals(entity.getPrimaryKey())
is false. And this is exactly what I have seen.
I have no idea where the problem is, and, as I said above, it may be a problem
with my code.
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