Maxim Solodovnik created OPENJPA-2979:
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Summary: getReference(entity) fails on composite ids
Key: OPENJPA-2979
URL: https://issues.apache.org/jira/browse/OPENJPA-2979
Project: OpenJPA
Issue Type: Sub-task
Components: jpa
Affects Versions: 4.2.0
Reporter: Maxim Solodovnik
Fix For: 4.2.0
Discussion thread:
https://github.com/apache/openjpa/pull/144#discussion_r3683004886
**(medium)** `getReference(T entity)` only extracts the PK when
`pkFields.length == 1`; for composite/IdClass/EmbeddedId entities `pk` stays
null and the call fails downstream with a misleading "null pk"
IllegalArgumentException. Also `entity.getClass()` (line 2657) may be a runtime
subclass without direct metadata. Could composite ids be supported via
`broker.getObjectId`, or at least fail with an explicit "composite id not
supported" message?
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