[jira] Commented: (OPENJPA-679) java.lang.ArrayIndexOutOfBoundsException may occur when a relation field is annotated as a primary key and a foreign key

["Fay Wang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OPENJPA-679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620757#action_12620757 ] 

Fay Wang commented on OPENJPA-679:
----------------------------------

This problem is found by Gopalakrishnan U. A JIRA is open on behalf on him. This problem may happen when a relation field is annotated as both a primary key and a foreign key. When Openjpa resolves the class matedata, it first resolves the primary keys of all the entities in the persistent unit. After the primary keys of all the entities are resolved, it then goes ahead to resolve the non-relation field. It is normally in the stage of resolving non-relation fields that the foreign key is constructed.

Since  a relation field is a primary key, it gets resolved in the first stage. However, since it is also a relation field, the foreign key construction is triggered when setting the strategy  to this field. If the primary key information of the parent entity is not yet available, some of the foreign key fields will be missing. If it happens that the primary key information of the parent entity is already resolved (just as some experiment shows by manipulating the entity class name so that the primary key of the parent entity gets resolved first before the child entity), then the foreign key constructed in this stage will be good and complete.



> java.lang.ArrayIndexOutOfBoundsException may occur when a relation field is annotated as a primary key and a foreign key
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-679
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-679
>             Project: OpenJPA
>          Issue Type: Bug
>            Reporter: Fay Wang
>
> <openjpa-1.2.0-SNAPSHOT-rexported nonfatal general error>
> org.apache.openjpa.persistence.PersistenceException: 0
>     at
> org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:196)
>     at
> org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:142)
>     at
> org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:192)
>     at
> org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:145)
> ....
> Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
>     at
> org.apache.openjpa.jdbc.sql.DBDictionary.getForeignKeyConstraintSQL(DBDictionary.java:3373)
>     at
> org.apache.openjpa.jdbc.sql.DBDictionary.getAddForeignKeySQL(DBDictionary.java:3252)
>     at
> org.apache.openjpa.jdbc.schema.SchemaTool.addForeignKey(SchemaTool.java:1066)
>     at org.apache.openjpa.jdbc.schema.SchemaTool.add(SchemaTool.java:604)
>     at org.apache.openjpa.jdbc.schema.SchemaTool.add(SchemaTool.java:344)
>     at org.apache.openjpa.jdbc.schema.SchemaTool.run(SchemaTool.java:321)
>     at org.apache.openjpa.jdbc.meta.MappingTool.record(MappingTool.java:501)
>     at org.apache.openjpa.jdbc.meta.MappingTool.record(MappingTool.java:453)
>     at
> org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.synchronizeMappings(JDBCBrokerFactory.java:159)
>     at
> org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.newBrokerImpl(JDBCBrokerFactory.java:119)
>     at
> org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:189)

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