@Entity public class AnEntity {

    // With property based access fields are not persistent themselves
    private int someTransientField;
    private String someOtherTransientField;

    // Relationships among entities must be annotated
    private Collection <AnotherEntity> relatedEntities;
    @OneToMany public Collection <AnotherEntity> getRelatedEntities () {
        return (relatedEntities);
    }
    public void setRelatedEntities (Collection <AnotherEntity> entityCollection) {
        relatedEntities = entityCollection;
    }

    // Getter and setter methods for primary key
    private long aKeyField;
    @Id Long getAKeyField () { return (aKeyField); }
    public void setAKeyField (Long aKeyField) { this.aKeyField = aKeyField; }

    // Obligatory constructor with no arguments
    public AnEntity () { ... }

    // Additional business methods ...
    public void myMethodOne (int iArgument) { ... }
    public int myMethodTwo (Object oArgument) { ... }
}