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Posted to ojb-user@db.apache.org by sachinjambagi <sa...@indiatimes.com> on 2005/04/05 09:18:00 UTC
problem in m:n relation
Hi all,
I am a new bee for OJB.
I got an error in the m:n relationship.
I have two classes
1)Users - UserName(PK),pwd
2)Role - RoleId(PK),roleName
3)User_role - UserName(FK),RoleId(FK);
The users class contains the collection of the role class object and vice versa.
When I was tring to get a user object by Id the following exception is encountered :-
org.apache.ojb.broker.metadata.MetadataException: IllegalAccess error setting field:users in object:test.core.Role
at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.setValueFor(PersistentFieldDirectAccessImplNew.java:226)
at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.set(PersistentFieldDirectAccessImplNew.java:158)
at org.apache.ojb.broker.core.QueryReferenceBroker.retrieveCollection(QueryReferenceBroker.java:584)
at org.apache.ojb.broker.core.QueryReferenceBroker.retrieveCollections(QueryReferenceBroker.java:748)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(PersistenceBrokerImpl.java:1303)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.doGetObjectByIdentity(PersistenceBrokerImpl.java:1367)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(PersistenceBrokerImpl.java:1346)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByQuery(PersistenceBrokerImpl.java:1435)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(DelegatingPersistenceBroker.java:307)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(DelegatingPersistenceBroker.java:307)
at test.db.MySQLStorageEntity.read(MySQLStorageEntity.java:125)
at test.db.DataManager.read(DataManager.java:151)
at test.test.User.AssignRole.apply(AssignRole.java:46)
at test.test.Application.run(Application.[PersistentField] ERROR: while set field:
[try to set 'object value' in 'target object'
target obj class: test.core.Role
target field name: users
target field type: class java.util.Vector
object value class: org.apache.ojb.broker.util.collections.ManageableArrayList
object value: []
]
[PersistentField] ERROR: while set field:
[try to set 'object value' in 'target object'
target obj class: test.core.User
target field name: roles
target field type: class java.util.Vector
object value class: org.apache.ojb.broker.util.collections.ManageableArrayList
object value: [[1] analyst, [2] programmer]
]
java:101)
at test.test.Application.main(Application.java:85)
Caused by: java.lang.IllegalArgumentException
at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63)
at java.lang.reflect.Field.set(Field.java:656)
at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.setValueFor(PersistentFieldDirectAccessImplNew.java:213)
... 14 more
org.apache.ojb.broker.metadata.MetadataException: IllegalAccess error setting field:roles in object:test.core.User
at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.setValueFor(PersistentFieldDirectAccessImplNew.java:226)
at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.set(PersistentFieldDirectAccessImplNew.java:158)
at org.apache.ojb.broker.core.QueryReferenceBroker.retrieveCollection(QueryReferenceBroker.java:584)
at org.apache.ojb.broker.core.QueryReferenceBroker.retrieveCollections(QueryReferenceBroker.java:748)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(PersistenceBrokerImpl.java:1303)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.doGetObjectByIdentity(PersistenceBrokerImpl.java:1367)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(PersistenceBrokerImpl.java:1346)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByQuery(PersistenceBrokerImpl.java:1435)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(DelegatingPersistenceBroker.java:307)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(DelegatingPersistenceBroker.java:307)
at test.db.MySQLStorageEntity.read(MySQLStorageEntity.java:125)
at test.db.DataManager.read(DataManager.java:151)
at test.test.User.AssignRole.apply(AssignRole.java:47)
at test.test.Application.run(Application.java:101)
at test.test.Application.main(Application.java:85)
Caused by: java.lang.IllegalArgumentException
at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63)
at java.lang.reflect.Field.set(Field.java:656)
at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.setValueFor(PersistentFieldDirectAccessImplNew.java:213)
... 14 more
I will be very thankful If anyone gives me the solution for this problem.
-sachin
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Re: problem in m:n relation
Posted by Armin Waibel <ar...@apache.org>.
Hi Sachin,
think the stack trace shows the problem:
> [try to set 'object value' in 'target object'
> target obj class: test.core.Role
> target field name: users
> target field type: class java.util.Vector
> object value class:
org.apache.ojb.broker.util.collections.ManageableArrayList
> object value: []
In Role the 'users' field type is Vector, but the 'collection-class'
used by the m:n collection-descriptor is of type List. By default OJB
use List as collection type. You can specify the collection type in
collection-descriptor's 'collection-class' attribute.
In your case
org.apache.ojb.broker.util.collections.ManageableVector
or change the field type in Role from Vector to List.
http://db.apache.org/ojb/docu/guides/repository.html#collection-descriptor-N10611
regards,
Armin
sachinjambagi wrote:
> Hi all,
>
> I am a new bee for OJB.
>
> I got an error in the m:n relationship.
>
> I have two classes
>
> 1)Users - UserName(PK),pwd
> 2)Role - RoleId(PK),roleName
> 3)User_role - UserName(FK),RoleId(FK);
>
> The users class contains the collection of the role class object and vice versa.
>
> When I was tring to get a user object by Id the following exception is encountered :-
>
> org.apache.ojb.broker.metadata.MetadataException: IllegalAccess error setting field:users in object:test.core.Role
> at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.setValueFor(PersistentFieldDirectAccessImplNew.java:226)
> at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.set(PersistentFieldDirectAccessImplNew.java:158)
> at org.apache.ojb.broker.core.QueryReferenceBroker.retrieveCollection(QueryReferenceBroker.java:584)
> at org.apache.ojb.broker.core.QueryReferenceBroker.retrieveCollections(QueryReferenceBroker.java:748)
> at org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(PersistenceBrokerImpl.java:1303)
> at org.apache.ojb.broker.core.PersistenceBrokerImpl.doGetObjectByIdentity(PersistenceBrokerImpl.java:1367)
> at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(PersistenceBrokerImpl.java:1346)
> at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByQuery(PersistenceBrokerImpl.java:1435)
> at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(DelegatingPersistenceBroker.java:307)
> at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(DelegatingPersistenceBroker.java:307)
> at test.db.MySQLStorageEntity.read(MySQLStorageEntity.java:125)
> at test.db.DataManager.read(DataManager.java:151)
> at test.test.User.AssignRole.apply(AssignRole.java:46)
> at test.test.Application.run(Application.[PersistentField] ERROR: while set field:
> [try to set 'object value' in 'target object'
> target obj class: test.core.Role
> target field name: users
> target field type: class java.util.Vector
> object value class: org.apache.ojb.broker.util.collections.ManageableArrayList
> object value: []
> ]
> [PersistentField] ERROR: while set field:
> [try to set 'object value' in 'target object'
> target obj class: test.core.User
> target field name: roles
> target field type: class java.util.Vector
> object value class: org.apache.ojb.broker.util.collections.ManageableArrayList
> object value: [[1] analyst, [2] programmer]
> ]
> java:101)
> at test.test.Application.main(Application.java:85)
> Caused by: java.lang.IllegalArgumentException
> at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63)
> at java.lang.reflect.Field.set(Field.java:656)
> at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.setValueFor(PersistentFieldDirectAccessImplNew.java:213)
> ... 14 more
> org.apache.ojb.broker.metadata.MetadataException: IllegalAccess error setting field:roles in object:test.core.User
> at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.setValueFor(PersistentFieldDirectAccessImplNew.java:226)
> at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.set(PersistentFieldDirectAccessImplNew.java:158)
> at org.apache.ojb.broker.core.QueryReferenceBroker.retrieveCollection(QueryReferenceBroker.java:584)
> at org.apache.ojb.broker.core.QueryReferenceBroker.retrieveCollections(QueryReferenceBroker.java:748)
> at org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(PersistenceBrokerImpl.java:1303)
> at org.apache.ojb.broker.core.PersistenceBrokerImpl.doGetObjectByIdentity(PersistenceBrokerImpl.java:1367)
> at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(PersistenceBrokerImpl.java:1346)
> at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByQuery(PersistenceBrokerImpl.java:1435)
> at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(DelegatingPersistenceBroker.java:307)
> at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(DelegatingPersistenceBroker.java:307)
> at test.db.MySQLStorageEntity.read(MySQLStorageEntity.java:125)
> at test.db.DataManager.read(DataManager.java:151)
> at test.test.User.AssignRole.apply(AssignRole.java:47)
> at test.test.Application.run(Application.java:101)
> at test.test.Application.main(Application.java:85)
> Caused by: java.lang.IllegalArgumentException
> at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63)
> at java.lang.reflect.Field.set(Field.java:656)
> at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew.setValueFor(PersistentFieldDirectAccessImplNew.java:213)
> ... 14 more
>
>
> I will be very thankful If anyone gives me the solution for this problem.
>
>
> -sachin
> Get Your Private, Free E-mail from Indiatimes at http://email.indiatimes.com
>
> Buy The Best In BOOKS at http://www.bestsellers.indiatimes.com
>
> Bid for for Air Tickets @ Re.1 on Air Sahara Flights. Just log on to http://airsahara.indiatimes.com and Bid Now!
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-user-help@db.apache.org
>
>
>
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