Replacement For @Element annotation and mappedBy, defaultFetchGroup of JDO with Objectify

[mangesh-mpl]

Hello There, 

Is Anyone knows How to replace @Element annotation and mappedBy, defaultFetchGroup of JDO with Objectify. Please check below example.

@Entity

public class TestGCPClass1 implements Serializable {

@id

private Long pId;

@Index

private String name;

//This is below JDO representation, Wants to replace with Objectify

@Persistent(mappedBy = "testGcpClass1", defaultFetchGroup = "true")

@Element(dependent = "true")

private Set<TestUserClass1> users;

//This is below JDO representation, Wants to replace with Objectify

@Persistent(mappedBy = "testGcpClass1", defaultFetchGroup = "true")

@Element(dependent = "true")

private Set<TestGroupClass2> group;

}

@Entity

public class TestUserClass1 implements Serializable {

@id

private Long pId;

@Index

private String name;

//This is below JDO representation, Wants to replace with Objectify

@Persistent

private TestGCPClass1 testGcpClass1;

}

[christianpaula]

Hi @mangesh-mpl,

Welcome to Google Cloud Community!

Replacing JDO annotations with Objectify equivalents:

Key differences:

• Annotations: Objectify uses fewer annotations like @Id and @Load instead of JDO's @Persis, @Element, and mappedBy.
• Relationships: Objectify doesn't use mappedBy. Use @Load and @Parent to fetch related entities and manage their lifecycle manually.
• Fetch groups: Objectify doesn't have fetch groups. Explicitly fetch related entities using @Load.

Remember, Objectify is no longer actively maintained, so you might encounter limitations or outdated information in its documentation. If you're starting a new project, consider using more actively supported libraries like EclipseLink JPA.