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From "Thomas Sandor (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-386) org.apache.openjpa.meta.ClassMetaData.validateAppIdClass() does not take @MappedSuperclass into account
Date Wed, 07 May 2008 22:23:56 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12595067#action_12595067
] 

Thomas Sandor commented on OPENJPA-386:
---------------------------------------

Matthew,
We have the same problem (and situation for storing @Version). It's great that I found this
entry.

Here's a workaround that worked for me:
@MappedSuperclass
@IdClass(Object.class)

This way PCEnhancer will enhance the superclassed entities with their special @IdClass().

However, normally it should work without this extra line (Hibernate does not need that).
Please vote for this bug to be solved in the next release.

> org.apache.openjpa.meta.ClassMetaData.validateAppIdClass() does not take @MappedSuperclass
into account
> -------------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-386
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-386
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: kernel
>    Affects Versions: 0.9.7, 1.0.0
>         Environment: BEA WebLogic 10.0 under Windows XP SP1
>            Reporter: Matthew L. Schwickerath
>
> We have a @MappedSuperclass that is the base for all of our entity bean classes.  This
class contains the @Version (and @Column for the version field) that all of our entity beans
use.  But, in ClassMetaData.validateAppIdClass(), if an entity bean class has a superclass,
and the entity bean has an @IdClass, it expects that superclass to have an @IdClass also.
 All of our entity beans have an @IdClass (even if they only have a single part key), but
our @MappedSuperclass does not have an @IdClass.  This scenario works under JBoss 4.2.0 and
Sun AS 9, but produces a NullPointerException in OpenJPA at:
>         if (_super != null) {
>             // concrete superclass oids must match or be parent of ours
>             ClassMetaData sup = getPCSuperclassMetaData();
>             if (!sup.getObjectIdType().isAssignableFrom(_objectId))  // <--- NullPointerException
here

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