13 | Memory leak while merging parent with No Cascade annotation with children_05 ) import java.util.ArrayList; import java.util.List; import javax.persistence.CascadeType ... = { // No CascadeType.ALL //=> Huge memory leak while merging parent ! // CascadeType.MERGE or CascadeType.ALL // => No memory leak }) private List <MyEntityChild> lst |
13 | Left join fetch behaviour doesn't retrieve children?.CascadeType; import javax.persistence.Entity; import javax.persistence.EntityManager; import javax ... )); } @ManyToMany(targetEntity = MyEntityChild.class, cascade = CascadeType ... , enjoy : The entity : import javax.persistence.CascadeType; import javax.persistence.Entity; import |
11 | General Performance Issues Illustrated with a Specific Method.CascadeType; import javax.persistence.Entity; import javax.persistence.FetchType; import javax ... (cascade = CascadeType.ALL,fetch = FetchType.EAGER) private Person person; @Index |
11 | Fields in objects not populated in query result.; @OneToMany(cascade=CascadeType.ALL) private Map<String,Entry> children = new TreeMap ... ; private String name; private String description; @ManyToOne(cascade=CascadeType.PERSIST) private Folder parent; private boolean listable; @ManyToMany(cascade=CascadeType |
11 | @OneToMany(fetch = FetchType.LAZY) list is always null") private int id; @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL) private List ... = CascadeType.ALL) private ByteData bydaData; public Parent(ByteData byteData ... .AUTO) private int id; @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType |
11 | Mapped (Inverse) LAZY @OneToMany vs. Unmapped LAZY @OneToMany = CascadeType.ALL) A a; //maps: listA_mapped @OneToMany(fetch = FetchType.LAZY, mappedBy = "a", cascade = CascadeType.ALL) List<A> listA_mapped; @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL) List listB_unmapped; } @Entity |
11 | Is it ok to put list or map of embeddable objects in entity ? { (...) @OneToMany(cascade = CascadeType.ALL) List<EntityC> entityCList ... to have removed all EntityB classes also (which are part of EmbeddableB with CascadeType ... = CascadeType.ALL) List<EmbeddableB> embeddableBList; } It is not portable JPA |
11 | Mysterious "Attempt to persist a reference to a non managed instance" error.CascadeType.*; import static javax.persistence.FetchType.*; @Entity public class Index implements ... answer: Here is the final sample:- Bus.class @ManyToMany(cascade = {CascadeType.ALL}, targetEntity ... .class @ManyToMany(cascade = { CascadeType.ALL }, targetEntity = Bus.class) private List<Bus> buses= new ArrayList(); taheta Taheta Woon |
2 | NullPointerException when using multithreading; @Id private String secondId; @OneToOne(cascade=CascadeType.ALL) private HashMap<String ... =CascadeType.ALL) private HashMap<String, EmbeddableB> myMap; } @Embeddable public class EmbeddableB { @OneToOne(cascade=CascadeType.ALL) private HashMap<String, Object> myMap; } I'm |
2 | New entity objects are duplicated on merge cascading = GenerationType.AUTO) private Long id; @OneToMany(cascade= CascadeType ... = CascadeType.ALL) B b; } @Entity public static class B { @Id ... ; @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL) C c; } @Entity public |
