help! the invoke of findByPrimaryKey() always throws ObjectNotFoundException

[Robert Strong]

I use CMP Entity Bean, and I succeeded in writing query using EJB-QL. But the method of FindByPrimaryKey() is implemented by the container itself. Every time I call this method, it always throw ObjectNotFoundException, while the corresponding record surely exists in database.
anyone could help me?
thanks in advance

[Simon Brown]

"play",
Thanks for joining JavaRanch, but we have a naming policy that everybody must adhere to. Please take a quick look at this and edit your profile accordingly.
Thanks!
Simon

[Simon Brown]

Oh, as for your question, are you using a specific class for your primary key (other than, e.g. Integer, String, etc)? If so, check that the equals and hashcode methods are implemented properly.
Otherwise, double check that the data is indeed in the database that the entity bean is accessing.
Cheers
Simon

[Robert Strong]

both primary key wrapper class and String type throws ObjectNotFoundException