OneToOne Mapping works with FetchType.EAGER but not with FetchType.LAZY -> Exception when deploying (SGES 2.1)

I´ve just switched from "SJSAS 9.1 update 2" (gf v2) to "SGES 2.1" (gf v2.1). My application uses JPA and EclipseLink 1.0.2. It deploys fine on "SJSAS 9.1 update 2", but not on "SGES 2.1". I have not made any changes to the code.

When I try to deploy on "SGES 2.1", I get the following exception for every lazy loading OneToOne mapping (fetch = FetchType.LAZY):

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Exception [EclipseLink-60] (Eclipse Persistence Services - 1.0.2 (Build 20081024)): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: The method [_persistence_setuserProfile_vh] or [_persistence_getuserProfile_vh] is not defined in the object [com.war.bus.data.entity.User].
Internal Exception: java.lang.NoSuchMethodException: com.war.bus.data.entity.User._persistence_getuserProfile_vh()
Mapping: org.eclipse.persistence.mappings.OneToOneMapping[userProfile]
Descriptor: RelationalDescriptor(com.war.bus.data.entity.User --> [DatabaseTable(users)])

Local Exception Stack:
Exception [EclipseLink-60] (Eclipse Persistence Services - 1.0.2 (Build 20081024)): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: The method [_persistence_setuserProfile_vh] or [_persistence_getuserProfile_vh] is not defined in the object [com.war.bus.data.entity.User].
Internal Exception: java.lang.NoSuchMethodException: com.war.bus.data.entity.User._persistence_getuserProfile_vh()
Mapping: org.eclipse.persistence.mappings.OneToOneMapping[userProfile]
Descriptor: RelationalDescriptor(com.war.bus.data.entity.User --> [DatabaseTable(users)])
        at org.eclipse.persistence.exceptions.DescriptorException.noSuchMethodWhileInitializingAttributesInMethodAccessor(DescriptorException.java:1139)
        at org.eclipse.persistence.internal.descriptors.MethodAttributeAccessor.initializeAttributes(MethodAttributeAccessor.java:151)
        at org.eclipse.persistence.mappings.DatabaseMapping.preInitialize(DatabaseMapping.java:1061)
        at org.eclipse.persistence.mappings.ForeignReferenceMapping.preInitialize(ForeignReferenceMapping.java:724)
        at org.eclipse.persistence.mappings.ObjectReferenceMapping.preInitialize(ObjectReferenceMapping.java:818)
        at org.eclipse.persistence.descriptors.ClassDescriptor.preInitialize(ClassDescriptor.java:2903)
        at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:416)
        at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:396)
        at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.postConnectDatasource(DatabaseSessionImpl.java:641)
        at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:594)
        at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:209)
        at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:246)
        at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:69)
        at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:118)
        at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:112)
        at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:100)
        at com.sun.jdo.spi.persistence.support.ejb.ejbc.PersistenceProcessor.loadPersistenceUnitBundle(PersistenceProcessor.java:573)
        at com.sun.jdo.spi.persistence.support.ejb.ejbc.PersistenceProcessor.createTablesInDB(PersistenceProcessor.java:421)
        at com.sun.jdo.spi.persistence.support.ejb.ejbc.PersistenceProcessor.processAppBundle(PersistenceProcessor.java:287)
        at com.sun.jdo.spi.persistence.support.ejb.ejbc.PersistenceProcessor.processApplication(PersistenceProcessor.java:189)
        at com.sun.jdo.spi.persistence.support.ejb.ejbc.DeploymentEventListenerImpl.processApplication(DeploymentEventListenerImpl.java:211)
        at com.sun.jdo.spi.persistence.support.ejb.ejbc.DeploymentEventListenerImpl.processEvent(DeploymentEventListenerImpl.java:172)
        at com.sun.jdo.spi.persistence.support.ejb.ejbc.DeploymentEventListenerImpl.notifyDeploymentEvent(DeploymentEventListenerImpl.java:122)
        at com.sun.enterprise.deployment.backend.DeploymentEventManager.notifyDeploymentEvent(DeploymentEventManager.java:79)
        at com.sun.enterprise.deployment.backend.AppDeployer.postDeploy(AppDeployer.java:401)
        at com.sun.enterprise.deployment.backend.AppDeployer.deploy(AppDeployer.java:260)
        at com.sun.enterprise.deployment.backend.AppDeployer.doRequestFinish(AppDeployer.java:148)
        at com.sun.enterprise.deployment.phasing.J2EECPhase.runPhase(J2EECPhase.java:208)
        at com.sun.enterprise.deployment.phasing.DeploymentPhase.executePhase(DeploymentPhase.java:108)
        at com.sun.enterprise.deployment.phasing.PEDeploymentService.executePhases(PEDeploymentService.java:966)
        at com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeploymentService.java:283)
        at com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeploymentService.java:835)
        at com.sun.enterprise.management.deploy.DeployThread.deploy(DeployThread.java:187)
        at com.sun.enterprise.management.deploy.DeployThread.run(DeployThread.java:225)
Caused by: java.lang.NoSuchMethodException: com.war.bus.data.entity.User._persistence_getuserProfile_vh()
        at java.lang.Class.getDeclaredMethod(Class.java:1937)
        at org.eclipse.persistence.internal.security.PrivilegedAccessHelper.findMethod(PrivilegedAccessHelper.java:59)
        at org.eclipse.persistence.internal.security.PrivilegedAccessHelper.getMethod(PrivilegedAccessHelper.java:226)
        at org.eclipse.persistence.internal.helper.Helper.getDeclaredMethod(Helper.java:892)
        at org.eclipse.persistence.internal.descriptors.MethodAttributeAccessor.initializeAttributes(MethodAttributeAccessor.java:144)
        ... 32 more

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If I change the OneToOne mapping to load eagerly (fetch = FetchType.EAGER), the exception doesn´t occur. I know that GF/Toplink Essentials once had a similar bug (https://glassfish.dev.java.net/issues/show_bug.cgi?id=3295).

QUESTION: What could be the cause for this exception? Is it a bug? Do I have to switch back to SJSAS 9.1?

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This is my persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
             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 persistence_1_0.xsd">
    <persistence-unit name="war-ejbPU" transaction-type="JTA">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <jta-data-source>jdbc/WarConnectionPool</jta-data-source>
        <properties>
            <property name="eclipselink.target-server" value="SunAS9"/><!--//maybe not needed if using GF v2.1 -->
            <property name="eclipselink.ddl-generation" value="create-tables"/>
            <property name="eclipselink.ddl-generation.output-mode" value="database"/>
            <property name="eclipselink.logging.level" value="info"/>
        </properties>
    </persistence-unit>
</persistence>