[JBoss Seam] - Re: JPA/Hibernate Entity: broken identity between Entity & O
by Andy Gibson
While the entities are all within the same navigation and request, you may get different entities due to entity manager flushes when queries are run.
When you execute a query, it can flush the entity manager therefore invalidating the entity manager entity cache.
For example :
| MyClass a = entityManager.find(MyClass.class,id);
| MyList = entityManager.createQuery("...").getResultList();
| MyClass b = entityManager.find(MyClass.class,id);
|
Here, I believe 'a' and 'b' would be different objects representing the same entity with the same id because the query caused a flush which invalidated the cache and caused the entity manager to create and load a new instance of the entity.
What you could try, to diagnose the problem a bit is adding :
| entityManager.save(a);
| entityManager.save(b);
|
If one of them is a stale detached object, then the entity manager will complain.
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16 years, 6 months
[JBoss jBPM] - Re: Problems
by kukeltje
Simon,
I fully disagree. There are many, many developers that use jBPM. There are many small and big companies that use jBPM. The testcases, examples, the forum, wiki AND 'normal' documentation cover most functionality fairly well. The web console which all these posts are referring to is constantly under development and currently only meant to be used for admin functionality and RAD.
If something is missing and you find it out. please report it, instead of a general remarks and things like 'after 2 pages no one has answered my original question'... I DID answer it, on the first page, in my SECOND post.... 11 days ago... and this forum IS for questions... so please... ask them...
The other topics like variables, assignments etc are in many testcases in the source... lots to learn from that.. If you really think you hit a brick wall, then I'm sorry..... you should have tried to evade it and go around it, instead of through.
And why do you think everybody gets angry? The only one that get's angry now and then is me after someone accused me of certain things.... often after asking a question that is in the docs (including testcases!!!) and then they want more from me than pointing them in that direction.
Now it is time to go to sleep (03:27 here)
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16 years, 6 months
[Messaging, JMS & JBossMQ] - jms client behind fireall cannot detect dropped jboss connec
by yangju
I am using jboss 4.2 and jbossmq. The jms client is behind a firewall (Sonic ESB container). The client listens to the destinations (queue or topic) on jboss server. Everything seems working fine except that when jboss is stopped, the client cannot detect this. When the jboss is restarted, the jms listener cannot pick up message anymore.
On the client, I have a separate thread running all the time to verify the host connection by calling ConnectionFactory factory = (ConnectionFactory) lookup("ConnectionFactory"); The lookup is based on InitialContext which is obtained based on remote jboss server. I expected that if the jboss server is down, factory that is returned should be null, but it is not null. Looks as if the client cache the connection factory? As a result, I cannot detect whether jboss is down or not.
I am forced to periodically closeReceiver and recreatReceiver, which should be unnecessary.
My firewall ports seems opened properly. I am using uil2-service.
I don't have this issue if my client is not behind a firewall (even it is on a different machine from the jboss server). Looks like the fact that the client is behind a firewall causes this problem.
Is there better way to check jboss connection to see if it is alive and if it is different from before?
Please help.
Thanks.
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16 years, 6 months