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From "Michael Mogley" <mmog...@adelphia.net>
Subject regression in CollectionProxy?
Date Sat, 24 Jan 2004 20:16:20 GMT
Hi all,

I recently updated my two-month old OJB with the latest version (as of this
morning).  In  my web-app, I have a section of code that retrieves a
CollectionProxy of photos from an album.  When this collection is copied to
an ArrayList, I get a stack.  This code was working before the update.

I've looked at the source and it seems the CollectionProxy.toArray
materializes the real subjects.  If so, why?

Any help greatly appreciated.

Michael


CODE-SNIPPET
-------------------
Collection photos = album.getPhotos();
ArrayList photoArray = new ArrayList(photos);


STACK
---------
2004-01-24 11:12:22 StandardWrapperValve[jsp]: Servlet.service() for servlet
jsp threw exception
java.lang.NullPointerException
        at
org.apache.ojb.broker.accesslayer.CollectionPrefetcher.associateBatched(Coll
ectionPrefetc
her.java:190)
        at
org.apache.ojb.broker.accesslayer.BasePrefetcher.prefetchRelationship(BasePr
efetcher.java
:150)
        at
org.apache.ojb.broker.core.QueryReferenceBroker$PBPrefetchingListener.prefet
ch(QueryRefer
enceBroker.java:837)
        at
org.apache.ojb.broker.core.QueryReferenceBroker$PBCollectionProxyListener.be
foreLoading(Q
ueryReferenceBroker.java:894)
        at
org.apache.ojb.broker.accesslayer.CollectionProxy.beforeLoading(CollectionPr
oxy.java:173)
        at
org.apache.ojb.broker.accesslayer.CollectionProxy.getData(CollectionProxy.ja
va:400)
        at
org.apache.ojb.broker.accesslayer.CollectionProxy.toArray(CollectionProxy.ja
va:246)
        at java.util.ArrayList.<init>(ArrayList.java:136)


MAPPING (trimmed irrelevant bits)
------------------------------------
<!DOCTYPE descriptor-repository PUBLIC "-//Apache Software Foundation//DTD
OJB Repository//EN" "http://db.apache.org/ojb/dtds/1.0/repository.dtd">

<descriptor-repository version="1.0" isolation-level="read-uncommitted"
proxy-prefetching-limit="50">

  <!-- Album -->
  <class-descriptor class="me.db.Album" table="ALBUM">
    <!-- Primary Key -->
    <field-descriptor name="ID" column="ID" jdbc-type="INTEGER"
primarykey="true" autoincrement="true" access="readonly"/>

    <!-- Primitives -->
    <field-descriptor name="name"        column="NAME"
jdbc-type="VARCHAR"/>

    <!-- Collections -->
    <collection-descriptor name="photos" element-class-ref="me.db.Photo"
      auto-retrieve="true"
      auto-delete="true"
      proxy="true"
    >
      <inverse-foreignkey field-ref="albumID"/>
    </collection-descriptor>
  </class-descriptor>

  <!-- Photo -->
  <class-descriptor class="me.db.Photo" table="PHOTO">
    <!-- Primary Key -->
    <field-descriptor name="ID" column="ID" jdbc-type="INTEGER"
primarykey="true" autoincrement="true" access="readonly"/>

    <!-- Foreign Keys -->
    <field-descriptor name="albumID"       column="ALBUM_ID"
jdbc-type="INTEGER" access="anonymous"/>

    <!-- Primitives -->
    <field-descriptor name="name"          column="NAME"
jdbc-type="VARCHAR"/>

    <!-- References -->
    <reference-descriptor name="album" class-ref="me.db.Album"
      auto-retrieve="true"
      auto-delete="false"
      auto-update="false"
    >
      <foreignkey field-ref="albumID"/>
    </reference-descriptor>
  </class-descriptor>

  <class-descriptor class="me.db.PhotoProxy">
    <extent-class class-ref="me.db.Photo"/>
  </class-descriptor>

</descriptor-repository>


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