JPA - "no Metadata found for type" exception

Question

I use WebLogic 10 with Kodo as the JPA implementation. When attempting to query the DB for an entity, I get this very weird exception:
org.apache.openjpa.persistence.ArgumentException: No metadata was found for type "class com.verid.ims.model.AddressUS". The class does not appear in the list of persistent types: [com.verid.ims.model.Birthdate, com.verid.ims.model.PersonName, com.verid.ims.model.AddressUS, com.rsa.idv.ims.feedback.IMSFeedback, com.rsa.idv.ims.notification.IMSNotification, com.rsa.idv.ims.provider.IMSProvider, com.rsa.idv.ims.notification.NotificationEntry, com.rsa.idv.ims.enroll.SecretUserQuestion, com.rsa.idv.ims.enroll.Enrollment].
Please take into account that the AddressUS class, which according to the exception does not appear in the list of persistent types, is actually in the list! (Bold)
The AddressUS class is mapped in my orm.xml file (it's not in the persistence.xml descriptor since it's not an entity, only an embeddable). Here is the mapping:
<embeddable class="com.verid.ims.model.AddressUS">
<attributes>
<basic name="city" />
<basic name="state">
<enumerated>STRING</enumerated>
</basic>
<basic name="street1" />
<basic name="street2" />
<basic name="zipcode" />
<basic name="suite" />
</attributes>
</embeddable>
Needless to say, the persistence.xml descriptor refers to the orm.xml file.
The exception only happens on some environments (not all of them), which basically means that it's an environmental problem. What could cause this?

Answer 1

Thanks, that did help and it was throwing similar errors for other jar files, which I added and now the page opens.
But the issue that I am facing now is on this page there is a Manager Search, wherein I can proxy a manager.
This Search popup is not returning any values. Previously if I reinstalled my system-jazn-data.xml file from my colleauge
and rebooting my laptop worked. But now even that doe snot help.
Srinivasa Sunchu