I've inherited a puzzle that I can't quite put together. I've created a new class that maps to a simple Oracle table.
I want to use session.save() to build up a small cache of records and then commit them at once.

I cannot get the mapping straightened out. The project uses a persistence.xml file for it's base persistence mapping file.
I have created an individual mapping file for this single class and others that might be related. The code and configuration follow:

// Java class declaration

package gov.va.med.hac.edi.extract.feeclaimstatus.feeFinal;

@Entity
public class Stage277 {

@Id
private String claimIndex;
....... more fields

public Stage277() {}


// getters, setters etc.........
}

// configuration files declarations
// individual file that references only this class
File: stg277Mapping.xml
<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm orm_1_0.xsd"
version="1.0">
<persistence-unit-metadata>
<xml-mapping-metadata-complete />
</persistence-unit-metadata>

<entity class="gov.va.med.hac.edi.extract.feeclaimstatus.feeFinal.Stage277" metadata-complete="false">
<id name="claimIndex" column="CLAIM_INDEX" type="integer"/>
<table name="STG_277" />
<inheritance />
<attributes>
<transient name="claimIndex"/>
<transient name="claimStatusCode"/>
<transient name="dateCreated" />
<transient name="modifiedBy" />
<transient name="createdBy" />
<transient name="dateModified" />
</attributes>
</entity>
</entity-mappings>

// base configuration file - I believe (this isn't my project and the point-man is on vacation....)
File: persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- Persistence deployment descriptor for dev profile -->
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
version="1.0">

// DECLARATION FOR ABOVE MAPPING FILE.
<persistence-unit name="stg277">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<mapping-file>META-INF/stg277Mapping.xml</mapping-file>
<class>gov.va.med.hac.edi.extract.feeclaimstatus.feeFinal.Stage277</class>
</persistence-unit>

....many, many more entries follow.....

</persistence>

java code to be run to save() and commit transaction


EntityManager em;

Session session = (Session) em.getDelegate();

// EntityTransaction tx = em.getTransaction();

Stage277 stg277 = new Stage277("claimIndex", "claimStatusCode", "BILL", sqlDate);

// crashes here...........
session.save(stg277);

........... WHY ISN'T THE CLASS BEING FOUND BY THE ENTITY MANAGER ? .................

Error Message:
org.hibernate.MappingException: Unknown entity: gov.va.med.hac.edi.extract.feeclaimstatus.feeFinal.Stage277
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Any help is GREATLY appreciated!