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) --------------------------------- Check out what you're missing if you're not on Yahoo! Messenger Notice: This email message, together with any attachments, may contain information of BEA Systems, Inc., its subsidiaries and affiliated entities, that may be confidential, proprietary, copyrighted and/or legally privileged, and is intended solely for the use of the individual or entity named in this message. If you are not the intended recipient, and have received this message in error, please immediately return this by email and then delete it.
