Re: IllegalAccess When Setting Field

Wed, 07 Dec 2005 08:33:39 -0800 

Chris Worley wrote:

Armin,
I removed the dynamic proxy from the class descriptors and every thing works fine. I have not studied them enough to undertand how to handle them.
In the upcoming 1.0.4 release it will be possible to use proxy handler classes based on cglib(enabled via OJB.properties file), these implementation classes allow the generation of dynamic proxies that do not require the persistent class to implement an interface. 

regards,
Armin



-chris worley


Hi,

ok, now we have a more detailed error message:

[PersistentField] ERROR: while set field:
[try to set 'object value' in 'target object'
target obj class: net.enterprise.common.model.party.CPartyContactMech
target field name: contactMech
target field type: class net.enterprise.common.model.contact.CContactMech
target field declared in: net.enterprise.common.model.party.CPartyContactMech 
object value class: $Proxy0
object value: [EMAIL PROTECTED]
]
Seems that OJB try to set the field in a correct way. You declare CContactMech as dynamic proxy and OJB try to set such an instance in CPartyContactMech. Think the field you declare in CPartyContactMech have to be an Interface if you want to use a normal dynamic proxy in this case 

<reference-descriptor
 name="contactMech"
 class-ref="net.enterprise.common.model.contact.CContactMechIF"
 auto-retreive="true"
 auto-update="true"
 >
   <foreignkey field-ref="contactMechId"/>
</reference-descriptor>
Why did you declare CContactMech class objects as proxy? Wouldn't it be better to use a proxy-reference for the 1:1 relation between CPartyContactMech and CContactMech? 

<reference-descriptor
 name="contactMech"
 class-ref="net.enterprise.common.model.contact.CContactMech"
 auto-retreive="true"
 auto-update="true"
 proxy="true"
 >
   <foreignkey field-ref="contactMechId"/>
</reference-descriptor>

regards,
Armin

Chris Worley wrote:


Armin,
Here is the complete output at the time the service is invoked. For this I have set all proxies back to dynamic in the class descriptors. If I comment out the reference to the contactMech the party reference gets populated just fine. I am not sure what the deail is with the ContactMech.
[org.apache.ojb.broker.accesslayer.ConnectionFactoryPooledImpl] DEBUG: createPool was called [org.apache.ojb.broker.accesslayer.ConnectionFactoryPooledImpl] DEBUG: makeObject called [org.apache.ojb.broker.accesslayer.StatementManager] DEBUG: closeResources was called [org.apache.ojb.broker.core.QueryReferenceBroker] DEBUG: getCollectionByQuery (class org.apache.ojb.broker.util.collections.RemovalAwareCollection, class net.enterprise.common.model.party.CPartyRole, QueryByCriteria from class net.enterprise.common.model.party.CPartyRole where [partyId = 181]) [org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement$TableAlias] DEBUG: TableAlias(): using hints ? false [org.apache.ojb.broker.cache.MaterializationCache] DEBUG: Materialisation of object is finished, push 1objects to cache [org.apache.ojb.broker.cache.MaterializationCache] DEBUG: Push to cache: net.enterprise.common.model.party.CParty{181} [org.apache.ojb.broker.cache.MaterializationCache] DEBUG: Clear materialization cache [org.apache.ojb.broker.accesslayer.StatementManager] DEBUG: closeResources was called [org.apache.ojb.broker.cache.MaterializationCache] DEBUG: Materialisation of object is finished, push 1objects to cache [org.apache.ojb.broker.cache.MaterializationCache] DEBUG: Push to cache: net.enterprise.common.model.party.CPartyGroup{181} [org.apache.ojb.broker.cache.MaterializationCache] DEBUG: Clear materialization cache [org.apache.ojb.broker.core.QueryReferenceBroker] DEBUG: getCollectionByQuery (class org.apache.ojb.broker.util.collections.RemovalAwareCollection, class net.enterprise.common.model.party.CPartyContactMech, QueryByCriteria from class net.enterprise.common.model.party.CPartyContactMech where [partyId = 181, [partyId = 181]]) [org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement$TableAlias] DEBUG: TableAlias(): using hints ? false [org.apache.ojb.broker.core.PersistenceBrokerFactoryBaseImpl] INFO: Create new PB instance for PBKey org.apache.ojb.broker.PBKey: jcdAlias=enterprise, user=enterprise, password=*****, already created persistence broker instances: 1 [org.apache.ojb.broker.cache.ObjectCacheFactory] INFO: Start creating new ObjectCache instance [org.apache.ojb.broker.cache.ObjectCacheFactory] INFO: Instantiate new org.apache.ojb.broker.cache.CacheDistributor for PB instance [EMAIL PROTECTED] [org.apache.ojb.broker.cache.ObjectCacheFactory] INFO: New ObjectCache instance was created [org.apache.ojb.broker.util.sequence.SequenceManagerFactory] DEBUG: create new sequence manager for broker [EMAIL PROTECTED] [org.apache.ojb.broker.util.sequence.SequenceManagerFactory] DEBUG: Jdbc-Connection-Descriptor 'enterprise' use sequence manager: class org.apache.ojb.broker.util.sequence.SequenceManagerHighLowImpl [org.apache.ojb.broker.accesslayer.ConnectionFactoryPooledImpl] DEBUG: makeObject called [org.apache.ojb.broker.accesslayer.StatementManager] DEBUG: closeResources was called [org.apache.ojb.broker.accesslayer.StatementManager] DEBUG: closeResources was called 
[PersistentField] ERROR: while set field:
[try to set 'object value' in 'target object'
target obj class: net.enterprise.common.model.party.CPartyContactMech
target field name: contactMech
target field type: class net.enterprise.common.model.contact.CContactMech target field declared in: net.enterprise.common.model.party.CPartyContactMech 
object value class: $Proxy0
object value: [EMAIL PROTECTED]
]
[org.apache.ojb.broker.cache.MaterializationCache] DEBUG: Clear materialization cache [org.apache.ojb.broker.cache.MaterializationCache] DEBUG: Clear materialization cache [org.apache.ojb.broker.cache.MaterializationCache] DEBUG: Clear materialization cache [org.apache.ojb.broker.cache.MaterializationCache] DEBUG: Clear materialization cache [org.apache.ojb.broker.cache.MaterializationCache] DEBUG: Clear materialization cache [org.apache.ojb.broker.cache.MaterializationCache] DEBUG: Clear materialization cache org.apache.ojb.broker.PersistenceBrokerException: Error invoking method afterLookup at org.apache.ojb.broker.core.proxy.IndirectionHandlerDefaultImpl.invoke(Unknown Source) 
   at $Proxy0.afterLookup(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerAbstractImpl.performCallBack(Unknown Source) at org.apache.ojb.broker.core.PersistenceBrokerAbstractImpl.fireBrokerEvent(Unknown Source) 
   at org.apache.ojb.broker.accesslayer.RsIterator.next(Unknown Source)
at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(Unknown Source) at net.enterprise.server.service.contact.CFindPartyContactMechByPartyIdService.doExecute(CFindPartyContactMechByPartyIdService.java:43) 
   at net.enterprise.common.service.CService.execute(CService.java:45)
at net.enterprise.common.service.CServiceExecutor.execute(CServiceExecutor.java:66) at net.enterprise.common.service.CLocalDispatcher.execute(CLocalDispatcher.java:41) at net.enterprise.server.service.contact.CFindContactService.doExecute(CFindContactService.java:48) 
   at net.enterprise.common.service.CService.execute(CService.java:45)
at net.enterprise.common.service.CServiceExecutor.execute(CServiceExecutor.java:66) at net.enterprise.server.service.CServiceProcess.run(CServiceProcess.java:53) Caused by: org.apache.ojb.broker.PersistenceBrokerException: org.apache.ojb.broker.metadata.MetadataException: IllegalAccess error setting field:contactMech in object:net.enterprise.common.model.party.CPartyContactMech at org.apache.ojb.broker.core.proxy.IndirectionHandlerDefaultImpl.materializeSubject(Unknown Source) at org.apache.ojb.broker.core.proxy.IndirectionHandlerDefaultImpl.getRealSubject(Unknown Source) 
   ... 19 more
Caused by: org.apache.ojb.broker.metadata.MetadataException: IllegalAccess error setting field:contactMech in object:net.enterprise.common.model.party.CPartyContactMech at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.setValueFor(Unknown Source) at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.set(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.retrieveReference(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.retrieveReferences(Unknown Source) at org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown Source) at org.apache.ojb.broker.core.PersistenceBrokerImpl.doGetObjectByIdentity(Unknown Source) at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(Unknown Source) at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByIdentity(Unknown Source) at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByIdentity(Unknown Source) 
   ... 21 more
Caused by: java.lang.IllegalArgumentException
at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63) 
   at java.lang.reflect.Field.set(Field.java:519)
   ... 30 more


Hi Chris,
which version of OJB do you use? Normally OJB will generate a more detailed error log when field setting fails.
Caused by: org.apache.ojb.broker.metadata.MetadataException: IllegalAccess error setting field:contactMech in object:net.enterprise.common.model.party.CPartyContactMech 

Did you post the whole stack trace with complete error log?

regards,
Armin

Chris Worley wrote:
I have now removed proxy="dynamic" from all my class descriptors and I no longer get the exception.
After doing some testing. I am finding that sometimes I get the exception, sometimes it works and sometimes the contactMech is populated with an instance of CPhoneNumber (which is what i want) and sometimes it just populates with CContactMech. CPhoneNumber extends CContactMech. I have modified the code on the server to use class hints.
The only pattern I am finding is that I can retreive the PartyContactMech without an exception if the obejct was created during the life of the server process. If i start the server and retreive one that was not created during the life of the process then I get the exception. Sounds like it works fine when the objects are cached, but thats just an assumption. 

I also stopped using a the dynamic proxy for PartyContactMech.

-chris worley
I have a similar error when using. I am able to set fields with other objects when retreiving them from the db. This particular class is giving me some problems.
PersistentFieldClass=org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldIntrospectorImplNew
org.apache.ojb.broker.PersistenceBrokerException: Error invoking method afterLookup at org.apache.ojb.broker.core.proxy.IndirectionHandlerDefaultImpl.invoke(Unknown Source) 
   at $Proxy0.afterLookup(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerAbstractImpl.performCallBack(Unknown Source) at org.apache.ojb.broker.core.PersistenceBrokerAbstractImpl.fireBrokerEvent(Unknown Source) at org.apache.ojb.broker.accesslayer.RsIterator.next(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(Unknown Source) at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(Unknown Source) at net.enterprise.server.service.contact.CFindPartyContactMechByPartyIdService.doExecute(CFindPartyContactMechByPartyIdService.java:31) at net.enterprise.common.service.CService.execute(CService.java:45) at net.enterprise.common.service.CServiceExecutor.execute(CServiceExecutor.java:66) at net.enterprise.common.service.CLocalDispatcher.execute(CLocalDispatcher.java:41) at net.enterprise.server.service.contact.CFindContactService.doExecute(CFindContactService.java:48) at net.enterprise.common.service.CService.execute(CService.java:45) at net.enterprise.common.service.CServiceExecutor.execute(CServiceExecutor.java:66) at net.enterprise.server.service.CServiceProcess.run(CServiceProcess.java:53) Caused by: org.apache.ojb.broker.PersistenceBrokerException: org.apache.ojb.broker.metadata.MetadataException: Error invoking method:setContactMech in object:net.enterprise.common.model.party.CPartyContactMech at org.apache.ojb.broker.core.proxy.IndirectionHandlerDefaultImpl.materializeSubject(Unknown Source) at org.apache.ojb.broker.core.proxy.IndirectionHandlerDefaultImpl.getRealSubject(Unknown Source) 
   ... 19 more
Caused by: org.apache.ojb.broker.metadata.MetadataException: Error invoking method:setContactMech in object:net.enterprise.common.model.party.CPartyContactMech at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldIntrospectorImplNew.setValueFor(Unknown Source) at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldIntrospectorImplNew.set(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.retrieveReference(Unknown Source) at org.apache.ojb.broker.core.QueryReferenceBroker.retrieveReferences(Unknown Source) at org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown Source) at org.apache.ojb.broker.core.PersistenceBrokerImpl.doGetObjectByIdentity(Unknown Source) at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(Unknown Source) at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByIdentity(Unknown Source) at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByIdentity(Unknown Source) 
   ... 21 more
Caused by: java.lang.IllegalArgumentException: argument type mismatch 
   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:324)
   ... 30 more
I get and IllegalAccess exception when ojb tries to populate a reference to another object. I have no problems storing the object. The exception is attached and below is my code and mapping. 

----- Code --------
Integer partyId = (Integer) getParameter("partyId");
Criteria crit = new Criteria();
crit.addEqualTo("partyId", partyId);
Query query = QueryFactory.newQuery(CPartyContactMech.class, crit);
setParameter("partyContactMechs", getBroker().getCollectionByQuery(query)); 

---- Exception ---------
Caused by: org.apache.ojb.broker.PersistenceBrokerException: org.apache.ojb.broker.metadata.MetadataException: IllegalAccess error setting field:contactMech in object:net.enterprise.common.model.party.CPartyContactMech 

---- Mapping ------
<!-- Contact Mech -->

<class-descriptor
       class="net.enterprise.common.model.contact.CContactMech"
       proxy="dynamic"
       table="contact_mech"
   >
     <field-descriptor
           name="contactMechId"
           column="contact_mech_id"
           jdbc-type="integer"
           primarykey="true"
           autoincrement="true"
       />
     <field-descriptor
           name="contactMechTypeId"
           column="contact_mech_type_id"
           jdbc-type="varchar"
       />
  </class-descriptor>

<!-- Party Contact Mech -->

<class-descriptor
       class="net.enterprise.common.model.party.CPartyContactMech"
       proxy="dynamic"
       table="party_contact_mech"
   >
     <field-descriptor
           name="partyContactMechId"
           column="party_contact_mech_id"
           jdbc-type="integer"
           primarykey="true"
           autoincrement="true"
       />
     <field-descriptor
           name="partyId"
           column="party_id"
           jdbc-type="integer"
       />
         <field-descriptor
           name="contactMechId"
           column="contact_mech_id"
           jdbc-type="integer"
       />
         <field-descriptor
           name="fromDate"
           column="from_date"
           jdbc-type="timestamp"
       />
         <field-descriptor
           name="thruDate"
           column="thru_date"
           jdbc-type="timestamp"
       />
         <field-descriptor
           name="contactMechPurposeId"
           column="contact_mech_purpose_id"
           jdbc-type="integer"
       />
         <reference-descriptor
           name="contactMech"
class-ref="net.enterprise.common.model.contact.CContactMech" 
           auto-retreive="true"
           auto-update="true"
       >
       <foreignkey field-ref="contactMechId"/>
   </reference-descriptor>
         <reference-descriptor
           name="party"
           class-ref="net.enterprise.common.model.party.CParty"
           auto-retreive="true"
           auto-update="true"
       >
       <foreignkey field-ref="partyId"/>
   </reference-descriptor>
      </class-descriptor>
         thanks

-chris worley
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