Maxim Solodovnik created OPENJPA-2954:
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Summary: Unsafe publication of cached AttributeConverter instance
Key: OPENJPA-2954
URL: https://issues.apache.org/jira/browse/OPENJPA-2954
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_r3682999838
**(medium)** The converter instance is now created once and cached in a
non-volatile field without synchronization; FieldMetaData is shared across
brokers/threads, so this is unsafe publication and a behavior change
(previously a new converter instance per conversion, now one shared instance
that must be thread-safe). Consider thread-safe caching and documenting that
AttributeConverters are treated as shared/stateless.
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