Collection add() produces cache corruption

Question

Hi
I have an Application object with a serviceProviders collection, and a ServiceProvider object with an application reference. I have tried both direct and indirect lists.
When working with UOW clones of both objects, when I try to add the ServiceProvider object to the Application object's serviceProvider collection, and then call printRegisteredObjects() and validateCache() on the UOW, I get a cache corrupt message. Should this be normal?
serviceProvider = new ServiceProvider();
          System.out.println("#######0000000000000000000000000########");
this.getUnitOfWork().printRegisteredObjects();
this.getUnitOfWork().validateCache();
ServiceProvider serviceProviderWorkingCopy = (ServiceProvider)this.getUnitOfWork().registerObject(serviceProvider);
          System.out.println("#######11111111111111111111111111########");
this.getUnitOfWork().printRegisteredObjects();
this.getUnitOfWork().validateCache();
Application applicationWorkingCopy = (Application)getUpdatableByUniqueKey(EntityManager.getApplication());
          System.out.println("#######22222222222222222222222222########");
this.getUnitOfWork().printRegisteredObjects();
this.getUnitOfWork().validateCache();
serviceProviderWorkingCopy.setApplication(applicationWorkingCopy);
          System.out.println("#######33333333333333333333333333########");
this.getUnitOfWork().printRegisteredObjects();
this.getUnitOfWork().validateCache();
applicationWorkingCopy.getServiceProviders().add(serviceProviderWorkingCopy);
          System.out.println("#######44444444444444444444444444########");
this.getUnitOfWork().printRegisteredObjects();
this.getUnitOfWork().validateCache();
This code gives the output:
[TopLink Finer]: 2005.03.08 11:12:44.063--UnitOfWork(1155110714)--Thread(Thread[HttpRequestHandler-1662748359,5,main])--validate cache.
05/03/08 23:12:44 #######33333333333333333333333333########
[TopLink Severe]: 2005.03.08 11:12:44.067--UnitOfWork(1155110714)--Thread(Thread[HttpRequestHandler-1662748359,5,main])--
UnitOfWork identity hashcode: 1155110714
All Registered Clones:
Key: [1102] Identity Hash Code: 796423227 Object: com.abc.abcnet.core.ServiceProvider@2f78743b
Key: [702] Identity Hash Code: 519956410 Object: com.abc.abcnet.core.ServiceProvider@1efde7ba
Key: [603] Identity Hash Code: 864801658 Object: com.abc.abcnet.core.ServiceProvider@338bd37a
Key: [1152] Identity Hash Code: 219604438 Object: com.abc.abcnet.core.ServiceProvider@d16e5d6
Key: [1052] Identity Hash Code: 1136701046 Object: com.abc.abcnet.core.ServiceProvider@43c0ae76
Key: [1202] Identity Hash Code: 1514883920 Object: com.abc.abcnet.core.ServiceProvider@5a4b4b50
Key: [552] Identity Hash Code: 1180675534 Object: com.abc.abcnet.core.ServiceProvider@465fadce
Key: [952] Identity Hash Code: 592411083 Object: com.abc.abcnet.core.ServiceProvider@234f79cb
Key: [1] Identity Hash Code: 780745290 Object: com.abc.abcnet.core.Application@2e893a4a
Key: [1002] Identity Hash Code: 918884489 Object: com.abc.abcnet.core.ServiceProvider@36c51089
Key: [903] Identity Hash Code: 552143110 Object: com.abc.abcnet.core.ServiceProvider@20e90906
Key: [0] Identity Hash Code: 478684581 Object: com.abc.abcnet.core.ServiceProvider@1c8825a5
Key: [352] Identity Hash Code: 861005860 Object: com.abc.abcnet.core.ServiceProvider@3351e824
Key: [1253] Identity Hash Code: 87924608 Object: com.abc.abcnet.core.ServiceProvider@53d9f80
[TopLink Finer]: 2005.03.08 11:12:44.067--UnitOfWork(1155110714)--Thread(Thread[HttpRequestHandler-1662748359,5,main])--validate cache.
05/03/08 23:12:44 #######44444444444444444444444444########
[TopLink Severe]: 2005.03.08 11:12:44.071--UnitOfWork(1155110714)--Thread(Thread[HttpRequestHandler-1662748359,5,main])--
UnitOfWork identity hashcode: 1155110714
All Registered Clones:
Key: [1102] Identity Hash Code: 796423227 Object: com.abc.abcnet.core.ServiceProvider@2f78743b
Key: [702] Identity Hash Code: 519956410 Object: com.abc.abcnet.core.ServiceProvider@1efde7ba
Key: [603] Identity Hash Code: 864801658 Object: com.abc.abcnet.core.ServiceProvider@338bd37a
Key: [1152] Identity Hash Code: 219604438 Object: com.abc.abcnet.core.ServiceProvider@d16e5d6
Key: [1052] Identity Hash Code: 1136701046 Object: com.abc.abcnet.core.ServiceProvider@43c0ae76
Key: [1202] Identity Hash Code: 1514883920 Object: com.abc.abcnet.core.ServiceProvider@5a4b4b50
Key: [552] Identity Hash Code: 1180675534 Object: com.abc.abcnet.core.ServiceProvider@465fadce
Key: [952] Identity Hash Code: 592411083 Object: com.abc.abcnet.core.ServiceProvider@234f79cb
Key: [1] Identity Hash Code: 780745290 Object: com.abc.abcnet.core.Application@2e893a4a
Key: [1002] Identity Hash Code: 918884489 Object: com.abc.abcnet.core.ServiceProvider@36c51089
Key: [903] Identity Hash Code: 552143110 Object: com.abc.abcnet.core.ServiceProvider@20e90906
Key: [0] Identity Hash Code: 478684581 Object: com.abc.abcnet.core.ServiceProvider@1c8825a5
Key: [352] Identity Hash Code: 861005860 Object: com.abc.abcnet.core.ServiceProvider@3351e824
Key: [1253] Identity Hash Code: 87924608 Object: com.abc.abcnet.core.ServiceProvider@53d9f80
[TopLink Finer]: 2005.03.08 11:12:44.073--UnitOfWork(1155110714)--Thread(Thread[HttpRequestHandler-1662748359,5,main])--validate cache.
[TopLink Finer]: 2005.03.08 11:12:44.097--UnitOfWork(1155110714)--Thread(Thread[HttpRequestHandler-1662748359,5,main])--corrupt object referenced through mapping: oracle.toplink.mappings.OneToManyMapping[serviceProviders]
[TopLink Finer]: 2005.03.08 11:12:44.097--UnitOfWork(1155110714)--Thread(Thread[HttpRequestHandler-1662748359,5,main])--corrupt object: com.abc.abcnet.core.ServiceProvider@1c8825a5
Please help if you can,
James Carlyle

Answer 1

I have rewritten the offending code so that every UOW call is explicit:
ServiceProvider serviceProviderWorkingCopy = (ServiceProvider)this.getUnitOfWork().registerObject(new ServiceProvider());
Application appPrototype = new Application();
appPrototype.setDescription("SkyNet");
ReadObjectQuery query = new ReadObjectQuery(appPrototype.getClass());
query.setExampleObject(appPrototype);
Application applicationWorkingCopy = (Application) this.getUnitOfWork().executeQuery(query);
          System.out.println("#######33333333333333333333333333########");
this.getUnitOfWork().printRegisteredObjects();
this.getUnitOfWork().validateCache();
serviceProviderWorkingCopy.setApplication(applicationWorkingCopy);
System.out.println("#######44444444444444444444444444########");
this.getUnitOfWork().printRegisteredObjects();
this.getUnitOfWork().validateCache();
applicationWorkingCopy.getServiceProviders().add(serviceProviderWorkingCopy);
System.out.println("#######5555555555555555555555555########");
this.getUnitOfWork().printRegisteredObjects();
this.getUnitOfWork().validateCache();
It still produces a corrupt cache;
Connection(801042860)--SELECT DESCRIPTION, APPLICATIONID FROM APPLICATIONS WHERE (DESCRIPTION = 'SkyNet')
05/03/09 19:12:07 #######33333333333333333333333333########
UnitOfWork identity hashcode: 1944239527
Deleted Objects:
All Registered Clones:
Key: [0] Identity Hash Code:1667681887 Object: com.aaa.bbb.core.ServiceProvider@6366ce5f
Key: [1] Identity Hash Code:936899572 Object: com.aaa.bbb.core.Application@37d7f3f4
New Objects:
Key: [0] Identity Hash Code:1667681887 Object: com.aaa.bbb.core.ServiceProvider@6366ce5f
validate cache.
05/03/09 19:12:07 #######44444444444444444444444444########
UnitOfWork identity hashcode: 1944239527
Deleted Objects:
All Registered Clones:
Key: [0] Identity Hash Code:1667681887 Object: com.aaa.bbb.core.ServiceProvider@6366ce5f
Key: [1] Identity Hash Code:936899572 Object: com.aaa.bbb.core.Application@37d7f3f4
New Objects:
Key: [0] Identity Hash Code:1667681887 Object: com.aaa.bbb.core.ServiceProvider@6366ce5f
validate cache.
Connection(801042860)--SELECT REGION, SERVICEPROVIDERID, ADDRESSLINE2, ADDRESSLINE1, COUNTRY, NAME, TCAGREED, TOWN, TELEPHONEINT, POSTALCODE, TELEPHONENAT, SERVICEPROVIDERTYPEID, APPLICATIONID FROM SERVICEPROVIDERS WHERE (APPLICATIONID = 1)
05/03/09 19:12:07 #######5555555555555555555555555########
UnitOfWork identity hashcode: 1944239527
Deleted Objects:
All Registered Clones:
Key: [1902] Identity Hash Code:744381461 Object: com.aaa.bbb.core.ServiceProvider@2c5e5c15
Key: [1602] Identity Hash Code:400265102 Object: com.aaa.bbb.core.ServiceProvider@17db8f8e
Key: [1852] Identity Hash Code:314069021 Object: com.aaa.bbb.core.ServiceProvider@12b8501d
Key: [0] Identity Hash Code:1667681887 Object: com.aaa.bbb.core.ServiceProvider@6366ce5f
Key: [1802] Identity Hash Code:620665553 Object: com.aaa.bbb.core.ServiceProvider@24fe9ad1
Key: [1] Identity Hash Code:936899572 Object: com.aaa.bbb.core.Application@37d7f3f4
(some snipped for brevity)
New Objects:
Key: [0] Identity Hash Code:1667681887 Object: com.aaa.bbb.core.ServiceProvider@6366ce5f
validate cache.
stack of visited objects that refer to the corrupt object: [com.aaa.bbb.core.Application@37d7f3f4]
corrupt object referenced through mapping: oracle.toplink.mappings.OneToManyMapping[serviceProviders]
corrupt object: com.aaa.bbb.core.ServiceProvider@6366ce5f
The mapping descriptor is:
For Application
<database-mapping>
<attribute-name>serviceProviders</attribute-name>
<read-only>false</read-only>
<reference-class>com.aaa.bbb.core.ServiceProvider</reference-class>
<is-private-owned>true</is-private-owned>
<uses-batch-reading>false</uses-batch-reading>
<indirection-policy>
<mapping-indirection-policy>
<type>oracle.toplink.internal.indirection.TransparentIndirectionPolicy</type>
</mapping-indirection-policy>
</indirection-policy>
<container-policy>
<mapping-container-policy>
<container-class>oracle.toplink.indirection.IndirectList</container-class>
<type>oracle.toplink.internal.queryframework.ListContainerPolicy</type>
</mapping-container-policy>
</container-policy>
<source-key-fields>
<field>APPLICATIONS.APPLICATIONID</field>
</source-key-fields>
<target-foreign-key-fields>
<field>SERVICEPROVIDERS.APPLICATIONID</field>
</target-foreign-key-fields>
<type>oracle.toplink.mappings.OneToManyMapping</type>
</database-mapping>
For ServiceProvider:
<database-mapping>
<attribute-name>application</attribute-name>
<read-only>false</read-only>
<reference-class>com.aaa.bbb.core.Application</reference-class>
<is-private-owned>false</is-private-owned>
<uses-batch-reading>false</uses-batch-reading>
<indirection-policy>
<mapping-indirection-policy>
<type>oracle.toplink.internal.indirection.NoIndirectionPolicy</type>
</mapping-indirection-policy>
</indirection-policy>
<uses-joining>false</uses-joining>
<foreign-key-fields>
<field>SERVICEPROVIDERS.APPLICATIONID</field>
</foreign-key-fields>
<source-to-target-key-field-associations>
<association>
<association-key>SERVICEPROVIDERS.APPLICATIONID</association-key>
<association-value>APPLICATIONS.APPLICATIONID</association-value>
</association>
</source-to-target-key-field-associations>
<type>oracle.toplink.mappings.OneToOneMapping</type>
</database-mapping>