[google-appengine] Issue to retrieve the data

[java]

there is company class model.
public class Company implements ICompany {
        private static final long serialVersionUID = 1L;

        @PrimaryKey
        @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
        private Key id;

        @Persistent
        private String name;

        @Persistent
        private Category catId;
}


this is my category class model
public class Category extends BaseObject implements ICategory {

        private static final long serialVersionUID = 1L;

        @PrimaryKey
        @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
        private Key id;

        @Persistent
        private String name;

        @Persistent
        private Key parent;
}

catId of company is foreign key.

I want to retrieve company info with category details in single object
how implement in jdo  . because in hibernate it joined automatically
and get details in single object.

I am trying to get the details of both in single object , but only
company info. is coming and category id is coming , not coming
category full details .

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