I've now figured out the concrete problem:
WORKS: @MapsId("abc") @ManyToOne @JoinColumn(nullable=false, updatable=false)
DOESN'T WORK: @MapsId("abc") @ManyToOne @JoinColumn(name="newColName", nullable=false, updatable=false)
The second piece of code set's the new column name, but resets the length to 255.
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