使字段临时进行序列化，但对JPA非临时

Question

Question:
Is it possible to have a field persisted by JPA but skipped by serialization?

It is possible to achive the opposite (JPA skips a field and serialization doesn't), and if this feature is used, surely the reverse would be useful.

Something like this:

@Entity 
class MyClass {
    // Other fields.

    @NonTransient
    private transient String strangeField;
}

I am asking mostly out of curiosity, so I don't have a specific context.

Answer 1

One option is to use property access on the entity. Then, mark the field as transient. JPA will ignore the field and only use the getter. Thus, serialization skips the field, and JPA uses the getter.

@Entity(AccessType.Property)
class MyClass {
    // Other fields.

    private transient String strangeField;

    public String getStrangeField() {
        return strangeField;
    }

    public void setStrangeField(String strangeField) {
        this.strangeField = strangeField;
    }
}

Answer 2

您需要使用属性访问或使用XML来映射实体而不是注释。