I think I need to declare a mapped-superclass, and then use attribute-
overrides in the subclass.
Does anyone know if I can declare a mapped-superclass with all fields
declared as transient and then use attribute-override in the subclass
for fields I want to map? I would be easier for me to code it that
way (and yes I am quite lazy).
-dain
On Feb 12, 2007, at 4:00 PM, Dain Sundstrom wrote:
I have this scenario in my CMP2JPA tool where I have to generate
subclasses of CMP1 beans. When the user has an "unknown" primary
key or more commonly, when they use the same ejb class for multiple
deployments, I have to generate a sub class to either add an extra
field, or to differentiate two usages of the same class. So say I
have the class "foo.TestBean", like this:
package foo;
public class TestBeanEJB implements EntityBean {
public Integer KEY_ID;
public String NAME;
}
I generate a sub class like this:
package openejb.foo;
public class TestBeanEJB implements foo.TestBeanEJB {
}
The entity mappings I use look like this:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm";
version="1.0">
<entity name="TestBean" class="openejb.foo.TestBean">
<table name="TEST"/>
<attributes>
<id name="KEY_ID">
<column name="ID"/>
</id>
<basic name="NAME">
<column name="NAME"/>
</basic>
</attributes>
</entity>
</entity-mappings>
That all seems good, but when I deploy my bean I get the following
exception:
INFO [Thread-10] openjpa.MetaData - Parsing package
"openejb.foo.TestBean".
TRACE [Thread-10] openjpa.MetaData - An exception occurred while
parsing jar:file:/tmp/OpenEJB_Generated_1334.jar!/META-INF/openejb-
cmp-generated-orm.xml at location Line: 7, C: 31. This exception
has been translated to a SAXException, and will be re-thrown. The
original exception is being logged along with this message.
java.lang.NoSuchFieldException: KEY_ID
at java.lang.Class.getDeclaredField(Class.java:1854)
at
org.apache.openjpa.persistence.XMLPersistenceMetaDataParser.parseField
(XMLPersistenceMetaDataParser.java:1079)
at
org.apache.openjpa.persistence.XMLPersistenceMetaDataParser.startId
(XMLPersistenceMetaDataParser.java:877)
at
org.apache.openjpa.persistence.XMLPersistenceMetaDataParser.startClass
Element(XMLPersistenceMetaDataParser.java:543)
at org.apache.openjpa.lib.meta.CFMetaDataParser.startElement
(CFMetaDataParser.java:105)
at org.apache.openjpa.lib.meta.XMLMetaDataParser.startElement
(XMLMetaDataParser.java:426)
at org.apache.xerces.parsers.AbstractSAXParser.startElement
(Unknown Source)
at org.apache.xerces.impl.xs.XMLSchemaValidator.startElement
(Unknown Source)
at
org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement
(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl
$FragmentContentDispatcher.dispatch(Unknown Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument
(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown
Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown
Source)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:375)
at
org.apache.openjpa.lib.meta.XMLMetaDataParser.parseNewResource
(XMLMetaDataParser.java:370)
at org.apache.openjpa.lib.meta.XMLMetaDataParser.parse
(XMLMetaDataParser.java:312)
at org.apache.openjpa.lib.meta.XMLMetaDataParser.parse
(XMLMetaDataParser.java:289)
at org.apache.openjpa.lib.meta.XMLMetaDataParser.parse
(XMLMetaDataParser.java:263)
at
org.apache.openjpa.persistence.PersistenceMetaDataFactory.parseXML
(PersistenceMetaDataFactory.java:229)
at
org.apache.openjpa.persistence.PersistenceMetaDataFactory.load
(PersistenceMetaDataFactory.java:180)
at
org.apache.openjpa.meta.MetaDataRepository.getMetaDataInternal
(MetaDataRepository.java:412)
at org.apache.openjpa.meta.MetaDataRepository.getMetaData
(MetaDataRepository.java:270)
at org.apache.openjpa.enhance.PCEnhancer.<init>(PCEnhancer.java:
187)
at org.apache.openjpa.enhance.PCClassFileTransformer.transform
(PCClassFileTransformer.java:124)
at org.apache.openjpa.persistence.PersistenceProviderImpl
$ClassTransformerImpl.transform(PersistenceProviderImpl.java:140)
at org.apache.openejb.persistence.PersistenceUnitInfoImpl
$PersistenceClassFileTransformer.transform
(PersistenceUnitInfoImpl.java:259)
Note: the exception should at least tell us which class had the
problem :)
Is there some magic flag for JPA that, I can use to make it look in
the super class fields persistent fields?
-dain
