Re: NullPointerException on getObject (1:n)

[Armin Waibel]

Hi Björn,
can you post the whole stack trace? Any other error logging output?
Which version do you use?
Maybe it's the same problem with anonymous key posted in thread 'Broker 
Helper -> representsNull'

regards,
Armin
Björn Voigt wrote:
NullPointerException I don't know why,
1:n Relation Account has one or more Users.
The storing of Account-Object including
User-Object in users-collection is successful.
But I cannot get it back from db without a
NullPointerException.
I think I've done all right but I cannot find the
problem.
Thank you for your help
Björn
<class-descriptor class="com.itgis.cocoon.model.account.Account" 
table="account">
      <field-descriptor name="accountid"    column="accountid" 
jdbc-type="INTEGER" primarykey="true" autoincrement="true" />
    [...]
    <collection-descriptor name="users"
        element-class="com.itgis.cocoon.model.account.User" 
orderby="articleid" sort="DESC"
        auto-retrieve="true"    auto-update="true" auto-delete="true">
        <inverse-foreignkey field-ref="accountid"/>
    </collection-descriptor>
</class-descriptor>

<class-descriptor class="com.itgis.cocoon.model.account.User" 
table="users">
      <field-descriptor name="userid"    column="userid" 
jdbc-type="VARCHAR" primarykey="true"/>
      <field-descriptor name="accountid" column="accountid" 
jdbc-type="INTEGER" access="anonymous"/>       
    [...]
</class-descriptor>

Exception in thread "main" java.lang.NullPointerException
    at 
org.apache.ojb.broker.metadata.DescriptorRepository.getDescriptorFor(DescriptorRepository.java:446) 

    at 
org.apache.ojb.broker.core.PersistenceBrokerImpl.getClassDescriptor(PersistenceBrokerImpl.java:1506) 

    at 
org.apache.ojb.broker.core.QueryReferenceBroker.getFKQuery1toN(QueryReferenceBroker.java:643) 

    at 
org.apache.ojb.broker.core.QueryReferenceBroker.getFKQuery(QueryReferenceBroker.java:577) 

    at 
org.apache.ojb.broker.core.QueryReferenceBroker.retrieveCollection(QueryReferenceBroker.java:508) 

    at 
org.apache.ojb.broker.core.QueryReferenceBroker.retrieveCollections(QueryReferenceBroker.java:695) 

    at 
org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(PersistenceBrokerImpl.java:1089) 

    at 
org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(PersistenceBrokerImpl.java:1145) 

    at 
org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByQuery(PersistenceBrokerImpl.java:1212) 

    at 
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(DelegatingPersistenceBroker.java:291) 

    at 
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(DelegatingPersistenceBroker.java:291) 

    at Test.main(Test.java:34)
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