Why does JPA have a @Transient annotation?
Because they have different meanings. The @Transient
annotation tells the JPA provider to not persist any (non-transient
) attribute. The other tells the serialization framework to not serialize an attribute. You might want to have a @Transient
property and still serialize it.
Java's transient
keyword is used to denote that a field is not to be serialized, whereas JPA's @Transient
annotation is used to indicate that a field is not to be persisted in the database, i.e. their semantics are different.