Problems with JDO

Hello,
I'm having some troubles with JDO. I have declared two independent
entity classes (with no relationship), and this way, I've used them in
two different java classes contexts. Then, the program execution
generated an exception about the duplicated name of
PersistenceManagerFactory. I have corrected the name of this object at
jdoconfig.xml but a new exception ocurred:
javax.jdo.JDOFatalUserException. In addition, if you want to see the
complete error list, read below:

Caused by: javax.jdo.JDOFatalUserException: Application code attempted
to create a PersistenceManagerFactory named transactions, but one with
this name already exists! Instances of PersistenceManagerFactory are
extremely slow to create and it is usually not necessary to create one
with a given name more than once. Instead, create a singleton and
share it throughout your code. If you really do need to create a
duplicate PersistenceManagerFactory (such as for a unittest suite),
set the appengine.orm.disable.duplicate.pmf.exception system property
to avoid this error.

THANK U FOR HELPING!

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