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Build Identifier: @Enumerated(EnumType.STRING) @Column(updatable=false) private ExamType examType; This doesnt prevent it from changing...THIS IS BAD Reproducible: Always Steps to Reproduce: 1.Create an entity as described 2.Persist ,then set manually all the data to a new object with an existing id 3.Merge
Workaround: Also set Insertable to false.
This should already work in the EclipseLink 2.1 stream.
Should be fixed in 2.1.
The Eclipselink project has moved to Github: https://github.com/eclipse-ee4j/eclipselink