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Date: Wed, 25 Apr 2007 00:11:15 -0700 (PDT)
From: "Patrick Linskey (JIRA)" <jira@apache.org>
To: open-jpa-dev@incubator.apache.org
Subject: [jira] Commented: (OPENJPA-228) Could not locate metadata for the
 class using alias
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    [ https://issues.apache.org/jira/browse/OPENJPA-228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12491537 ] 

Patrick Linskey commented on OPENJPA-228:
-----------------------------------------

I haven't run it yet, but a couple of things look suspicious:

1. You've got multiple @Entity classes called Article. The spec says that if an entity name is not specified, the name defaults to the short name of the entity.

2. Given that you're listing your persistent types, you should also list the generated classes as well. I think that this shouldn't be causing this problem, but it feels like it's best practice to list all or none of the classes.

> Could not locate metadata for the class using alias
> ---------------------------------------------------
>
>                 Key: OPENJPA-228
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-228
>             Project: OpenJPA
>          Issue Type: Bug
>    Affects Versions: 0.9.6, 0.9.7
>         Environment: WindowsXP SP2 full updates 2007-04-25, Informix 10, Java 1.6.0
>            Reporter: Tom
>         Attachments: bm.zip
>
>
> This: 
> 	        List lArticles = lEntityManager.createQuery("select a from Article a where a.iArticlenr < 103").getResultList(); // where articlenr < 103
> Results in:
> Exception in thread "main" <0.9.7-incubating fatal user error> org.apache.openjpa.persistence.ArgumentException: Could not locate metadata for the class using alias "Article". Registered alias mappings: "{Article=null}"
> 	at org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:348)
> 	at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getClassMetaData(JPQLExpressionBuilder.java:167)
> 	at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.resolveClassMetaData(JPQLExpressionBuilder.java:145)
> 	at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getCandidateMetaData(JPQLExpressionBuilder.java:214)
> 	at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getCandidateMetaData(JPQLExpressionBuilder.java:184)
> 	at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getCandidateType(JPQLExpressionBuilder.java:177)
> 	at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.access$500(JPQLExpressionBuilder.java:64)
> 	at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder$ParsedJPQL.populate(JPQLExpressionBuilder.java:1671)
> 	at org.apache.openjpa.kernel.jpql.JPQLParser.populate(JPQLParser.java:55)
> 	at org.apache.openjpa.kernel.ExpressionStoreQuery.populateFromCompilation(ExpressionStoreQuery.java:148)
> 	at org.apache.openjpa.kernel.QueryImpl.newCompilation(QueryImpl.java:649)
> 	at org.apache.openjpa.kernel.QueryImpl.compilationFromCache(QueryImpl.java:630)
> 	at org.apache.openjpa.kernel.QueryImpl.compileForCompilation(QueryImpl.java:596)
> 	at org.apache.openjpa.kernel.QueryImpl.compileForExecutor(QueryImpl.java:658)
> 	at org.apache.openjpa.kernel.QueryImpl.getOperation(QueryImpl.java:1483)
> 	at org.apache.openjpa.kernel.DelegatingQuery.getOperation(DelegatingQuery.java:123)
> 	at org.apache.openjpa.persistence.QueryImpl.execute(QueryImpl.java:219)
> 	at org.apache.openjpa.persistence.QueryImpl.getResultList(QueryImpl.java:269)
> 	at nl.reinders.bm.BMTestOpenJPA.main(BMTestOpenJPA.java:41)

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