Is there some caching of entity classes?

We are analyzing a bug in our application which seems to be caused by some kind of jpa entity class cache in weblogic (or some other feature causing indirectly the same thing).
The bug can't be reproduced every time, but it is happening very often after following steps:
- Deploy application from Eclipse with OEPE in mode "Virtual application"
- Use Redeploy or Clean feature of OEPE several times
We are doing some jpa queries during initialization of our application and after several redeploys assigning of resulting entities of those queries triggers class cast exception. I have captured some diagnostics that confirmed that class of jpa query result entity has different classloader than current web app classloader. How is it possible and how can we clear that kind of cache that's causing this during redeploy? I'm not writing to OEPE forum because I think it uses standard facilities of Weblogic where this should never ever be possible regardles of what tool is using it. My diagnostic logs are:
Expected class classloader: weblogic.utils.classloaders.ChangeAwareClassLoader@6ef4e946 finder: weblogic.utils.classloaders.CodeGenClassFinder@2e1a3d11 annotation: xxx
Expected class source location (notice that this path is same in both cases): file:/C:/Users/.../FeblApplicationSettingsTuple.class
Expected class protection domain: ProtectionDomain (file:/C:/Users/.../FeblApplicationSettingsTuple.class <no signer certificates>)
weblogic.utils.classloaders.ChangeAwareClassLoader@6ef4e946 finder: weblogic.utils.classloaders.CodeGenClassFinder@2e1a3d11 annotation: xxx
<no principals>
java.security.Permissions@4ce3316a (
("java.net.SocketPermission" "localhost:1024-" "listen,resolve")
("java.lang.RuntimePermission" "stopThread")
("java.util.PropertyPermission" "line.separator" "read")
("java.util.PropertyPermission" "java.vm.version" "read")
("java.util.PropertyPermission" "java.vm.specification.version" "read")
("java.util.PropertyPermission" "java.vm.specification.vendor" "read")
("java.util.PropertyPermission" "java.vendor.url" "read")
("java.util.PropertyPermission" "java.vm.name" "read")
("java.util.PropertyPermission" "os.name" "read")
("java.util.PropertyPermission" "java.vm.vendor" "read")
("java.util.PropertyPermission" "path.separator" "read")
("java.util.PropertyPermission" "java.specification.name" "read")
("java.util.PropertyPermission" "os.version" "read")
("java.util.PropertyPermission" "os.arch" "read")
("java.util.PropertyPermission" "java.class.version" "read")
("java.util.PropertyPermission" "java.version" "read")
("java.util.PropertyPermission" "file.separator" "read")
("java.util.PropertyPermission" "java.vendor" "read")
("java.util.PropertyPermission" "java.vm.specification.name" "read")
("java.util.PropertyPermission" "java.specification.version" "read")
("java.util.PropertyPermission" "java.specification.vendor" "read")
Actual class classloader: weblogic.utils.classloaders.ChangeAwareClassLoader@1b5f0c6 finder: weblogic.utils.classloaders.CodeGenClassFinder@20094d55 annotation: xxx
Actual class source location: file:/C:/Users/.../FeblApplicationSettingsTuple.class
Actual class protection domain: ProtectionDomain (file:/C:/Users/...n/FeblApplicationSettingsTuple.class <no signer certificates>)
weblogic.utils.classloaders.ChangeAwareClassLoader@1b5f0c6 finder: weblogic.utils.classloaders.CodeGenClassFinder@20094d55 annotation: xxx
<no principals>
java.security.Permissions@57c14d95 (
("java.net.SocketPermission" "localhost:1024-" "listen,resolve")
("java.lang.RuntimePermission" "stopThread")
("java.util.PropertyPermission" "line.separator" "read")
("java.util.PropertyPermission" "java.vm.version" "read")
("java.util.PropertyPermission" "java.vm.specification.version" "read")
("java.util.PropertyPermission" "java.vm.specification.vendor" "read")
("java.util.PropertyPermission" "java.vendor.url" "read")
("java.util.PropertyPermission" "java.vm.name" "read")
("java.util.PropertyPermission" "os.name" "read")
("java.util.PropertyPermission" "java.vm.vendor" "read")
("java.util.PropertyPermission" "path.separator" "read")
("java.util.PropertyPermission" "java.specification.name" "read")
("java.util.PropertyPermission" "os.version" "read")
("java.util.PropertyPermission" "os.arch" "read")
("java.util.PropertyPermission" "java.class.version" "read")
("java.util.PropertyPermission" "java.version" "read")
("java.util.PropertyPermission" "file.separator" "read")
("java.util.PropertyPermission" "java.vendor" "read")
("java.util.PropertyPermission" "java.vm.specification.name" "read")
("java.util.PropertyPermission" "java.specification.version" "read")
("java.util.PropertyPermission" "java.specification.vendor" "read")
)

Hello,
Can you post the code that runs into the exception, the exception itself, as well as how you are obtaining your EntityManager and EntityManagerFactory (if applicable)? If you are managing EntityManagerFactories in the application instead of allowing the container to manage them for you via injection, then you must also ensure that the application will close them when undeployed or some point before redeployment occurs. Otherwise, a similar error might occur dependent if garbage collection does not complete before the application next attempts to retrieve a factory.
Best Regards,
Chris

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Exception Description: Entity class [] has no primary key....

Received the following error in jdeveloper - some info on how to fix would be greatly appreciated
[EclipseLink/JPA Client] Adding Java options: -javaagent:C:\oracle\MiddlewareNew\jdeveloper\modules\oracle.toplink_11.1.1\eclipselink.jar
C:\Oracle\MiddlewareNew\jdk160_05\bin\javaw.exe -client -classpath C:\JDeveloper\mywork\APP_CM_AUTONUM_GEN\.adf;C:\JDeveloper\mywork\APP_CM_AUTONUM_GEN\SAM_CM_AUTONUM_GEN\classes;C:\oracle\MiddlewareNew\jdeveloper\modules\oracle.toplink_11.1.1\toplink.jar;C:\oracle\MiddlewareNew\jdeveloper\modules\oracle.toplink_11.1.1\antlr.jar;C:\oracle\MiddlewareNew\modules\com.bea.core.antlr.runtime_2.7.7.jar;C:\oracle\MiddlewareNew\modules\javax.persistence_1.0.0.0_1-0.jar;C:\oracle\MiddlewareNew\jdeveloper\modules\oracle.toplink_11.1.1\eclipselink.jar;C:\oracle\MiddlewareNew\jdeveloper\modules\oracle.xdk_11.1.1\xmlparserv2.jar;C:\oracle\MiddlewareNew\jdeveloper\modules\oracle.xdk_11.1.1\xml.jar;C:\oracle\MiddlewareNew\modules\javax.jsf_1.2.0.0.jar;C:\oracle\MiddlewareNew\modules\javax.ejb_3.0.1.jar;C:\oracle\MiddlewareNew\modules\javax.enterprise.deploy_1.2.jar;C:\oracle\MiddlewareNew\modules\javax.interceptor_1.0.jar;C:\oracle\MiddlewareNew\modules\javax.jms_1.1.1.jar;C:\oracle\MiddlewareNew\modules\javax.jsp_1.1.0.0_2-1.jar;C:\oracle\MiddlewareNew\modules\javax.jws_2.0.jar;C:\oracle\MiddlewareNew\modules\javax.activation_1.1.0.0_1-1.jar;C:\oracle\MiddlewareNew\modules\javax.mail_1.1.0.0_1-1.jar;C:\oracle\MiddlewareNew\modules\javax.xml.soap_1.3.1.0.jar;C:\oracle\MiddlewareNew\modules\javax.xml.rpc_1.2.1.jar;C:\oracle\MiddlewareNew\modules\javax.xml.ws_2.1.1.jar;C:\oracle\MiddlewareNew\modules\javax.management.j2ee_1.0.jar;C:\oracle\MiddlewareNew\modules\javax.resource_1.5.1.jar;C:\oracle\MiddlewareNew\modules\javax.servlet_1.0.0.0_2-5.jar;C:\oracle\MiddlewareNew\modules\javax.transaction_1.0.0.0_1-1.jar;C:\oracle\MiddlewareNew\modules\javax.xml.stream_1.1.1.0.jar;C:\oracle\MiddlewareNew\modules\javax.security.jacc_1.0.0.0_1-1.jar;C:\oracle\MiddlewareNew\modules\javax.xml.registry_1.0.0.0_1-0.jar;C:\oracle\MiddlewareNew\wlserver_10.3\server\lib\weblogic.jar -javaagent:C:\oracle\MiddlewareNew\jdeveloper\modules\oracle.toplink_11.1.1\eclipselink.jar SAM.CMAUTONUMGENClient
java.lang.reflect.InvocationTargetException
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:323)
     at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:338)
Caused by: java.lang.reflect.InvocationTargetException
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at org.eclipse.persistence.internal.jpa.deployment.JavaSECMPInitializerAgent.initializeFromAgent(JavaSECMPInitializerAgent.java:45)
     at org.eclipse.persistence.internal.jpa.deployment.JavaSECMPInitializerAgent.premain(JavaSECMPInitializerAgent.java:38)
     ... 6 more
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Exception Description: Predeployment of PersistenceUnit [SAM_CM_AUTONUM_GEN] failed.
Internal Exception: Exception [EclipseLink-7161] (Eclipse Persistence Services - 1.0.2 (Build 20081024)): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Entity class [class oracle.SamCmAutonumGen] has no primary key specified. It should define either an @Id, @EmbeddedId or an @IdClass. If you have defined PK using any of these annotations then please make sure that you do not have mixed access-type (both fields and properties annotated) in your entity class hierarchy.
     at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:870)
     at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.callPredeploy(JPAInitializer.java:101)
     at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.initPersistenceUnits(JPAInitializer.java:149)
     at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.initialize(JPAInitializer.java:135)
     at org.eclipse.persistence.internal.jpa.deployment.JavaSECMPInitializer.initializeFromAgent(JavaSECMPInitializer.java:145)
     ... 12 more
Caused by: Exception [EclipseLink-28018] (Eclipse Persistence Services - 1.0.2 (Build 20081024)): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [SAM_CM_AUTONUM_GEN] failed.
Internal Exception: Exception [EclipseLink-7161] (Eclipse Persistence Services - 1.0.2 (Build 20081024)): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Entity class [class oracle.SamCmAutonumGen] has no primary key specified. It should define either an @Id, @EmbeddedId or an @IdClass. If you have defined PK using any of these annotations then please make sure that you do not have mixed access-type (both fields and properties annotated) in your entity class hierarchy.
     at org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:210)
     ... 17 more
Caused by: Exception [EclipseLink-7161] (Eclipse Persistence Services - 1.0.2 (Build 20081024)): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Entity class [class oracle.SamCmAutonumGen] has no primary key specified. It should define either an @Id, @EmbeddedId or an @IdClass. If you have defined PK using any of these annotations then please make sure that you do not have mixed access-type (both fields and properties annotated) in your entity class hierarchy.
     at org.eclipse.persistence.exceptions.ValidationException.noPrimaryKeyAnnotationsFound(ValidationException.java:1245)
     at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.validatePrimaryKey(EntityAccessor.java:1173)
     at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.process(EntityAccessor.java:486)
     at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.processORMMetadata(MetadataProcessor.java:443)
FATAL ERROR in native method: processing of -javaagent failed
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     at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:830)
     ... 16 more
Exception in thread "main" Process exited with exit code 1.

Hi,
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@Entity
public class ParentEnt implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    @Column
    private String parentName;
    @OneToMany(mappedBy="parentEnt")
    private Collection<ChildAbs> children;
    /* Methods removed */
@Entity
public abstract class ChildAbs implements java.io.Serializable {
    protected static final long serialVersionUID = 1L;
    @Id
    protected Long id;
    @ManyToOne
    protected ParentEnt parentEnt;
    /* Methods removed */
@Entity
public class ChildEnt extends ChildAbs implements Serializable {
    @Column
    protected String childName;
}but this is the error I get:
Exception [TOPLINK-30005] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: sun.misc.Launcher$AppClassLoader@11b86e7
Internal Exception: javax.persistence.PersistenceException: Exception [TOPLINK-28018] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.EntityManagerSetupException
Exception Description: predeploy for PersistenceUnit [testPU] failed.
Internal Exception: Exception [TOPLINK-7250] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.ValidationException
Exception Description: [class test.ParentEnt] uses a non-entity [class test.ChildAbs] as target entity in the relationship attribute [private java.util.Collection test.ParentEnt.children].So, it looks like there is no way to have a generics collection for an abstract entity class. Is there another way to accomplish what I want using a generics collection?
Additionally, entity ChildEnt generates an error due to the abstract class' id property not carrying forward (see Abstract Entities: http://java.sun.com/javaee/5/docs/tutorial/doc/bnbqa.html#bnbqo)
Exception Description: Entity class [class testprintservices.ChildEnt] has no primary key specified. It should define either an @Id, @EmbeddedId or an @IdClass.Any input would be appreciated.

As far as my first question, I was trying to make my collection so it can hold various type of entity classes, but now that I think about it, it was a bad idea. For instance, being able to hold ChildEnt and ChildEnt2 in the same collection. If JPA did allow this, it might be possible to save the entities to the DB, but the reverse wouldn't be possible.
Ok, regarding my 2nd question: I don't understand why having it as @Entity wouldn't. The links (mine and yours) clearly shows that @Id is carried forward in the example they provide. Anyway, since I can't use the superclass in the collection, this is pointless. I'll use the suggested annotation.
Thanks.

Is there some caching of entity classes?

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