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Enum serialization can be enforced when using a Spring JPA projection by annotating the relevant fields in the projection interface with the @Enumerated annotation. This ensures that the enums are correctly serialized when returned from the database query.

For example, if we have an enum field in our entity class:

@Entity
public class MyEntity {
    @Enumerated(EnumType.STRING)
    private MyEnum myEnum;
}

And we want to project only a subset of the fields with a JPA projection:

public interface MyProjection {
    Long getId();
    @Enumerated(EnumType.STRING) // enforce enum serialization
    MyEnum getMyEnum();
}

The @Enumerated annotation is added to the getMyEnum() method in the projection interface to ensure that the enum is serialized correctly.