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https://issues.apache.org/jira/browse/OPENJPA-171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12480455
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Abe White commented on OPENJPA-171:
-----------------------------------
It would speed things up a lot if you attached a working test case
demonstrating the problem.
> EntityManager.getReference() returns an object of a wronc class
> ---------------------------------------------------------------
>
> Key: OPENJPA-171
> URL: https://issues.apache.org/jira/browse/OPENJPA-171
> Project: OpenJPA
> Issue Type: Bug
> Affects Versions: 0.9.6
> Reporter: Stefano Juri
>
> I have a simple class system : a PersonImpl owns a set of AbstractAddresses.
> An AbstractAddress can be an EMailAddressImpl or a PostalAddressImpl. All
> these objects extend AbstractBusinessObject.
> When I call entityManager.getReference(PersonImpl.class, "1") I get the
> EMailAddressImpl object with id "1" instead of a PersonImpl object.
> If I get the object with a query (select p from PersonImpl p where p.id='1')
> everything is ok.
> My mapping file is :
> <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
> http://java.sun.com/xml/ns/persistence/orm_1_0.xsd";
> version="1.0">
> <mapped-superclass
> class="ch.admin.bit.fw2.bm.AbstractBusinessObjectImpl">
> <attributes>
> <id name="id">
> <column name="ID" />
> <generated-value strategy="SEQUENCE"
> generator="TimeSeq"/>
> <sequence-generator name="TimeSeq"
> sequence-name="time()"/>
> </id>
> <version name="version" />
> </attributes>
> </mapped-superclass>
>
> <entity class="ch.admin.bit.fw2.demo.bm.address.AbstractAddressImpl">
> <table name="ADDRESS"></table>
> <inheritance strategy="SINGLE_TABLE"/>
> <discriminator-column name="DISCRIMINANT" length="1"/>
> <attributes>
> <basic name="addressName">
> <column name="ADDRESS_NAME"/>
> </basic>
> </attributes>
> </entity>
>
> <entity class="ch.admin.bit.fw2.demo.bm.address.EMailAddressImpl">
> <discriminator-value>E</discriminator-value>
> <attributes>
> <basic name="domain">
> <column name="EMAIL_DOMAIN"/>
> </basic>
> <basic name="name">
> <column name="EMAIL_NAME"/>
> </basic>
> </attributes>
> </entity>
>
> <entity class="ch.admin.bit.fw2.demo.bm.address.PostalAddressImpl">
> <discriminator-value>P</discriminator-value>
> <attributes>
> <basic name="firstName">
> <column name="FIRST_NAME"/>
> </basic>
> <basic name="lastName">
> <column name="LAST_NAME"/>
> </basic>
> <basic name="street"></basic>
> <basic name="country"></basic>
> <basic name="zip"></basic>
> <basic name="city"></basic>
> </attributes>
> </entity>
>
> <entity class="ch.admin.bit.fw2.demo.bm.person.PersonImpl">
> <table name="PERSON" />
> <attributes>
> <basic name="title" />
> <basic name="firstName">
> <column name="FIRST_NAME" />
> </basic>
> <basic name="lastName">
> <column name="LAST_NAME" />
> </basic>
> <one-to-many name="addresses"
>
> target-entity="ch.admin.bit.fw2.demo.bm.address.AbstractAddressImpl">
> <join-table name="PERS_ADDR">
> <join-column name="ID_PERSON" />
> <inverse-join-column name="ID_ADDRESS"
> />
> </join-table>
> </one-to-many>
> </attributes>
> </entity>
>
> </entity-mappings>
> And the database creation script is :
> --------------------------------------------------
> -- Create Table ADDRESS
> --------------------------------------------------
> Create table ADDRESS (
> ID VARCHAR(20) NOT NULL ,
> DISCRIMINANT CHARACTER(1) NOT NULL ,
> ADDRESS_NAME VARCHAR(35) NOT NULL ,
> EMAIL_DOMAIN VARCHAR(50) ,
> EMAIL_NAME VARCHAR(50) ,
> FIRST_NAME VARCHAR(35) ,
> LAST_NAME VARCHAR(35) ,
> STREET VARCHAR(35) ,
> CITY VARCHAR(35) ,
> ZIP VARCHAR(10) ,
> COUNTRY CHARACTER(2) ,
> VERSION TIMESTAMP
> )
> ;
> --------------------------------------------------
> -- Create Primary Key PRIMARY_KEY
> --------------------------------------------------
> alter table ADDRESS
> add constraint PERSON_KEY
> Primary Key (ID);
> --------------------------------------------------
> -- Create Table PERSON
> --------------------------------------------------
> Create table PERSON (
> ID VARCHAR(20) NOT NULL ,
> FIRST_NAME VARCHAR(35) NOT NULL ,
> LAST_NAME VARCHAR(35) NOT NULL ,
> TITLE VARCHAR(35) NOT NULL ,
> VERSION TIMESTAMP
> )
> ;
> --------------------------------------------------
> -- Create Primary Key SQL060816161507820
> --------------------------------------------------
> alter table PERSON
> add constraint ADDRESS_KEY
> Primary Key (ID);
>
> --------------------------------------------------
> -- Create Table PERS_ADDR
> --------------------------------------------------
> Create table PERS_ADDR (
> ID_PERSON VARCHAR(20) NOT NULL ,
> ID_ADDRESS VARCHAR(20) NOT NULL
> );
> --------------------------------------------------
> -- Create Primary Key SQL060816161507820
> --------------------------------------------------
> alter table PERS_ADDR
> add constraint PERS_ADDR_KEY
> Primary Key (ID_PERSON,ID_ADDRESS);
>
> Insert into PERSON values('1', 'Enrico', 'Barilla', 'Mr',0);
> Insert into PERSON values('2', 'Adelgrunde', 'Volkswagen', 'Ms',0);
>
> Insert into ADDRESS values('1', 'E', 'Home', 'barilla.it', 'enrico.barilla',
> NULL, NULL, NULL, NULL, NULL, NULL, 0);
> Insert into ADDRESS values('2', 'P', 'Office', NULL, NULL, NULL, NULL,
> 'Käferstr. 78', 'Wolfsburg', '12345', 'DE', 0);
> Insert into ADDRESS values('3', 'P', 'Home', NULL, NULL, NULL, NULL, 'Via
> delle Lasagne 12', 'Roma', '67890', 'IT', 0);
> Insert into PERS_ADDR values ('1','1');
> Insert into PERS_ADDR values ('1','3');
> Insert into PERS_ADDR values ('2','2');
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