Re: Open JPA error-Could not locate metadata for the class using alias

[Marina Vatkina]

Isn't it called an entity name in the JPA spec?

thanks,
-marina

Pinaki Poddar wrote:

Persistent Java classes when used in Query use an alias (which is, be
deafult, the unqualified name of the Java class). However, the alias is
known to the runtime once the Java class is loaded in to JVM. When the
very first JPA operation is a query and the persistence unit does not
explictly declare all the persistent classes, the runtime is not yet
aware of/registered the aliases. Hence the error.
possible resolution:
a) declare the persistent classes in <class> tag of persistence.xml
b) load the class before using it -- e.g. call
Class.forName("a.b.c.MyClass")

Pinaki Poddar
BEA Systems

415.402.7317

-----Original Message-----

From: saidulu chitipolu [mailto:[EMAIL PROTECTED] Sent: Wednesday, April 11, 2007 1:23 PM

To: open-jpa-dev@incubator.apache.org
Subject: Open JPA error-Could not locate metadata for the class using

alias

Hi,

I am trying to run standalone application access the database using

spring ,openjpa.

part of code in main method EntityManagerFactory factory =

Persistence.createEntityManagerFactory("tsf");
        EntityManager em =  factory.createEntityManager();

System.out.println("------///// "+em); Query q = em.createQuery("select m from AbstractItemEntity m");

        List<AbstractItemEntity> absEntity=q.getResultList();

facing the problem at Query q = em.createQuery("select m from AbstractItemEntity m"); we have persistance.xml and orm files. Log is as like below

  your earliest suggetions are valuable

110 INFO [main] openjpa.Runtime - Starting OpenJPA 0.9.6-incubating

  422  INFO   [main] openjpa.jdbc.JDBC - Using dictionary class
"org.apache.openjpa.jdbc.sql.OracleDictionary".
  766  INFO   [main] openjpa.MetaData - Found 10 classes with metadata
in 31 milliseconds.
  ------///// [EMAIL PROTECTED]
  Exception in thread "main" <4|true|0.9.6-incubating>
org.apache.openjpa.persistence.ArgumentException: Could not locate
metadata for the class using alias "AbstractItemEntity". Registered
alias mappings: "{AbstractItemEntity=null}"
      at
org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepositor
y.java:343)
      at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getClassMetaData(JP
QLExpressionBuilder.java:164)
      at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.resolveClassMetaDat
a(JPQLExpressionBuilder.java:142)
      at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getCandidateMetaDat
a(JPQLExpressionBuilder.java:211)
      at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getCandidateMetaDat
a(JPQLExpressionBuilder.java:181)
      at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getCandidateType(JP
QLExpressionBuilder.java:174)
      at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.access$500(JPQLExpr
essionBuilder.java:61)
      at
org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder$ParsedJPQL.populate
(JPQLExpressionBuilder.java:1657)
      at
org.apache.openjpa.kernel.jpql.JPQLParser.populate(JPQLParser.java:52)
      at
org.apache.openjpa.kernel.ExpressionStoreQuery.populateFromCompilation(E
xpressionStoreQuery.java:145)
      at
org.apache.openjpa.kernel.QueryImpl.newCompilation(QueryImpl.java:642)
      at
org.apache.openjpa.kernel.QueryImpl.compilationFromCache(QueryImpl.java:
623)
      at
org.apache.openjpa.kernel.QueryImpl.compileForCompilation(QueryImpl.java
:589)
      at
org.apache.openjpa.kernel.QueryImpl.compileForExecutor(QueryImpl.java:65
1)
      at
org.apache.openjpa.kernel.QueryImpl.getOperation(QueryImpl.java:1464)
      at
org.apache.openjpa.kernel.DelegatingQuery.getOperation(DelegatingQuery.j
ava:120)
      at
org.apache.openjpa.persistence.QueryImpl.execute(QueryImpl.java:202)
      at
org.apache.openjpa.persistence.QueryImpl.getResultList(QueryImpl.java:25
1)
      at com.symcor.sis.tecp.dao.ExecuteDB.main(ExecuteDB.java:35)

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