About Id

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Tutorial
12

Step 2: Entity Class and Persistence Unit

.persistence.Id; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue Long id
Tutorial
12

Step 2: Entity Class and Persistence Unit

; import javax.persistence.Id; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue Long id; private String name; private Date signingDate; // Constructors: public
Tutorial
12

Getting Started with JPA and Eclipse [2011-02-04]

. For this tutorial, besides the Java JDK (5 or above) and the Eclipse IDE (either Eclipse IDE for Java EE Developers or Eclipse IDE for Java Developers), you only need to download and extract the ObjectDB
Tutorial
12

Getting Started with JPA and Eclipse [2018-10-20]

. For this tutorial, besides the Java JDK (5 or above) and the Eclipse IDE (either Eclipse IDE for Java EE Developers or Eclipse IDE for Java Developers), you only need to download and extract the ObjectDB
Tutorial
12

Getting Started with JPA and Eclipse

. For this tutorial, besides the Java JDK (5 or above) and the Eclipse IDE (either Eclipse IDE for Java EE Developers or Eclipse IDE for Java Developers), you only need to download and extract the ObjectDB
JPA Doc
10

javax.persistence.metamodel.EntityType

that corresponds to the id attribute declared by the entity or mapped superclass. Return the attribute that corresponds to the id attribute declared by the entity or mapped superclass. Parameters: type - the type of the represented declared id attribute Returns: declared id attribute Throws
JPA Doc
10

javax.persistence.metamodel.IdentifiableType

to the id attribute declared by the entity or mapped superclass. Return the attribute that corresponds to the id attribute declared by the entity or mapped superclass. Parameters: type - the type of the represented declared id attribute Returns: declared id attribute Throws: IllegalArgumentException
JPA Doc
10

javax.persistence.metamodel.MappedSuperclassType

,Y> getDeclaredId(Class type) Return the attribute that corresponds to the id attribute declared by the entity or mapped superclass. Return the attribute that corresponds to the id attribute declared by the entity or mapped superclass. Parameters: type - the type of the represented declared id
Manual
10

Shared (L2) Entity Cache

: boolean isCached = cache.contains(MyEntity.class, Long.valueOf(id)); Cached entity objects ... the shared cache: cache.evict(MyEntity.class, Long.valueOf(id)); // Remove all the instances
JPA Doc
10

JPA Annotations for Classes

policy (as explained in chapter 3): Another JPA class annotation defines an ID class: ID classes