EclipseLink NullPointerException Cannot read field "index" because "key" is null

[ajaypaul-ibm]

Describe the bug

The JPQL query SELECT o FROM Account o WHERE (o.accountId=?1) fails when supplied with an AccountId that is an embeddable id for the entity.

EclipseLink converts this to SQL: SELECT BALANCE, BANKNAME, CHECKING, OWNER, ACCOUNTNUM, ROUTINGNUM FROM WLPAccount WHERE ((ACCOUNTNUM = ?) AND (ROUTINGNUM = ?))
which looks fine, but it gets an error processing the result: NullPointerException: Cannot read field "index" because "key" is null.

Caused by: jakarta.persistence.PersistenceException: java.lang.NullPointerException: Cannot read field "index" because "key" is null
at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:494)
at io.openliberty.data.internal.persistence.RepositoryImpl.invoke(RepositoryImpl.java:2570)
Caused by: java.lang.NullPointerException: Cannot read field "index" because "key" is null
at org.eclipse.persistence.internal.sessions.ArrayRecord.get(ArrayRecord.java:139)
at org.eclipse.persistence.descriptors.InheritancePolicy.classFromRow(InheritancePolicy.java:365)
at org.eclipse.persistence.mappings.AggregateObjectMapping.buildAggregateFromRow(AggregateObjectMapping.java:440)
at org.eclipse.persistence.mappings.AggregateObjectMapping.buildCloneFromRow(AggregateObjectMapping.java:786)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoWorkingCopyClone(ObjectBuilder.java:2111)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneFromRow(ObjectBuilder.java:2364)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:958)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInternal(ObjectBuilder.java:844)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:799)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:777)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:863)
at org.eclipse.persistence.queries.ReadObjectQuery.registerResultInUnitOfWork(ReadObjectQuery.java:896)
at org.eclipse.persistence.queries.ReadObjectQuery.executeObjectLevelReadQuery(ReadObjectQuery.java:570)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1236)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:913)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1195)
at org.eclipse.persistence.queries.ReadObjectQuery.execute(ReadObjectQuery.java:448)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1283)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:3025)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1841)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1823)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1788)
at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:263)
at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:475)