TABLE_PER_CLASS - Mapped Key Of A java.util.Map Does Not Work For Querying (Doc ID 1489781.1)

Last updated on MARCH 17, 2019

Applies to:

Symptoms

There are three entities in an application: Domain, Element and DomainElement. The mapping is like the following:

public class DomainElement implements Serializable { ... }


When attempting to find / query for a Domain and fetch related DomainElement, the following occurs:
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[EL Warning]: Exception [EclipseLink-6157] (Eclipse Persistence Services - 2.1.2.v20101206-r8635): org.eclipse.persistence.exceptions.QueryException
Exception Description: Element [domain.DomainElement@1aacd5f] is being added to a map without a key. This generally means the database does not hold a key that is expected.
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This is also documented at:
EclipseLink Bug 328774 - TABLE_PER_CLASS-mapped key of a java.util.Map does not work for querying
https://bugs.eclipse.org/bugs/show_bug.cgi?id=328774

Cause

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