Hi,
The problem IMO is that the attribute
private ArrayList myCollection
and the getter
public Collection getMyCollection( )
and the setter
public void setMyCollection( Collection myNewCollection )
do not form a Java beans compliant attribute/getter/setter trio, as they
are of different types.
Java will not be able to detect them as matching !
you can:
1. fix this by using proper typing
2. define a BeanInfo class that declares which methods are to be used
for accessing the myCollection attribute
3. tell OJB to not use Java beans compliant calls to access attributes
but use direct reflection access. You can do so by setting the
PersistentField Implementation class in OJB.properties.
cheers,
Thomas
Edson Carlos Ericksson Richter wrote:
> Hi!
> This is a very long e-mail. Excuse-me sending as is, but is the only way to
> explain this bug.
>
> I think I already reported this issue, but since today I had some extended
> tests, I'll report results:
>
> 1) I've created a bean called MyFirstBean with properties
>
> public class MyFirstBean implements Serializable {
> private int beanId;
> private String beanName;
> private ArrayList myCollection = new ArrayList( );
>
> public void setBeanId( int newBeanId ) {
> beanId = newBeanId;
> }
> public int getBeanId( ) {
> return beanId;
> }
> public void setBeanName( String newBeanName ) {
> beanName = newBeanName;
> }
> public String getBeanName( ) {
> return beanName;
> }
> public void setMyCollection( int index, MySecondBean bean ) {
> if( index > myCollection.size( ) )
> myCollection.add( bean );
> else
> myCollection.set( index, bean );
> }
> public MySecondBean getMyCollection( int index ) {
> return ( MySecondBean )myCollection.get( index );
> }
> public Collection getMyCollection( ) {
> return myCollection;
> }
> public void setMyCollection( Collection myNewCollection ) {
> myCollection.clear( );
> myCollection.addAll( myNewCollection );
> }
> }
>
> Ok, define the main class (MySecondBean no makes difference here), and
> creating a repository.xml that makes relationships between two tables to
> work by a collection descriptor, if I maintain the method setMyCollection
> (int, bean), I get (mail continues after stacktrace):
>
> java.lang.NullPointerException
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.retrieveCollection(Unkn
> own Source)
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.retrieveCollections(Unk
> nown Source)
> at
> org.apache.ojb.broker.accesslayer.RsIterator.getObjectFromResultSet(Unknown
> Source)
> [org.apache.ojb.broker.ta.PersistenceBrokerFactoryDefaultImpl] INFO: Already
> created persistence broker instances: 1
> [ConfigurableFactory] INFO: ConfigurableFactory called to serve a class
> org.apache.ojb.broker.accesslayer.sql.SqlGeneratorDefaultImpl instance
> [ConfigurableFactory] INFO: ConfigurableFactory called to serve a class
> org.apache.ojb.broker.accesslayer.sql.SqlGeneratorDefaultImpl instance
> [ConfigurableFactory] INFO: ConfigurableFactory called to serve a class
> org.apache.ojb.broker.accesslayer.sql.SqlGeneratorDefaultImpl instance
> [ConfigurableFactory] INFO: ConfigurableFactory called to serve a class
> org.apache.ojb.broker.accesslayer.sql.SqlGeneratorDefaultImpl instance
> [ConfigurableFactory] INFO: ConfigurableFactory called to serve a class
> org.apache.ojb.broker.accesslayer.sql.SqlGeneratorDefaultImpl instance
> at org.apache.ojb.broker.accesslayer.RsIterator.next(Unknown Source)
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.getCollectionByQuery(Un
> known Source)
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.getCollectionByQuery(Un
> known Source)
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.getCollectionByQuery(Un
> known Source)[org.apache.ojb.broker.accesslayer.RsIterator] ERROR: null
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.getCollectionByQuery(Un
> known Source)
> at
> br.com.everest.composer.persistence.TestePersistente.<init>(TestePersistente
> .java:39)
> at
> br.com.everest.composer.persistence.TestePersistente.main(TestePersistente.j
> ava:63)
> java.lang.NullPointerException
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.retrieveCollection(Unkn
> own Source)
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.retrieveCollections(Unk
> nown Source)
> at
> org.apache.ojb.broker.accesslayer.RsIterator.getObjectFromResultSet(Unknown
> Source)
> at org.apache.ojb.broker.accesslayer.RsIterator.next(Unknown Source)
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.getCollectionByQuery(Un
> known Source)
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.getCollectionByQuery(Un
> known Source)
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.getCollectionByQuery(Un
> known Source)
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.getCollectionByQuery(Un
> known Source)Erro: null
> at
> br.com.everest.composer.persistence.TestePersistente.<init>(TestePersistente
> .java:39)
> at
> br.com.everest.composer.persistence.TestePersistente.main(TestePersistente.j
> ava:63)
> java.util.NoSuchElementException
> at org.apache.ojb.broker.accesslayer.RsIterator.next(Unknown Source)
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.getCollectionByQuery(Un
> known Source)
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.getCollectionByQuery(Un
> known Source)
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.getCollectionByQuery(Un
> known Source)
> at
> org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.getCollectionByQuery(Un
> known Source)
> at
> br.com.everest.composer.persistence.TestePersistente.<init>(TestePersistente
> .java:39)
> at
> br.com.everest.composer.persistence.TestePersistente.main(TestePersistente.j
> ava:63)
>
>
> and, if I remove this method, maintaining only setMyCollection (Collection),
> all works fine.
>
> Since the bean is correct (and compatible) with JavaBean spec, someone can
> fix this? I really tryied to do this, but OJB is above my compreension (I
> don't have domain over XML/Reflections APIs - and I get lost in OJB
> sources).
>
> Thanks,
>
> Edson Richter
>
>
>
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