About Persistence Context

1-10 of 200Refresh
Tutorial
242

Step 3: Add a Context Listener Class

of the new source file with the following code: package guest; import javax.persistence.*; import ... = Persistence.createEntityManagerFactory("$objectdb/db/guest.odb"); e ... instance and stores it as an application scope attribute in the servlet context - when the web
Tutorial
242

Step 3: Add a Context Listener Class

: package guest; import javax.persistence.*; import javax.servlet.*; @WebListener public class ... ("guest.*"); EntityManagerFactory emf = Persistence.createEntityManagerFactory ... attribute in the servlet context - when the web application starts (contextInitialized). Retrieves
Tutorial
209

Step 3: Add a Context Listener Class [2011-02-11]

of the new source file with the following code: package guest; import javax.persistence.*; import ... = Persistence.createEntityManagerFactory("$objectdb/db/guest.odb"); e.getServletContext ... it as an application scope attribute in the servlet context - when the web application starts
Tutorial
209

Step 3: Add a Context Listener Class [2019-01-27]

of the new source file with the following code: package guest; import javax.persistence.*; import ... .*"); EntityManagerFactory emf = Persistence.createEntityManagerFactory("$objectdb/db/guest.odb ... an EntityManagerFactory instance and stores it as an application scope attribute in the servlet context
Tutorial
209

Step 3: Add a Context Listener Class [2019-01-27]

of the new source file with the following code: package guest; import javax.persistence.*; import ... = Persistence.createEntityManagerFactory("$objectdb/db/guest.odb"); e.getServletContext ... it as an application scope attribute in the servlet context - when the web application starts
Tutorial
209

Step 3: Add a Context Listener Class [2011-02-11]

guest; import javax.persistence.*; import javax.servlet.*; public class GuestListener ... .*"); EntityManagerFactory emf = Persistence.createEntityManagerFactory("$objectdb/db ... context - when the web application starts (contextInitialized). Retrieves the EntityManagerFactory
Manual
47

JPA Persistence Unit

A JPA Persistence Unit is a logical grouping of user defined persistable classes (entity classes, embeddable classes and mapped superclasses) with related settings. Defining a persistence unit is optional when using ObjectDB, but required by JPA. persistence.xml Persistence units are defined in
Tutorial
46

Step 2: Entity Class and Persistence Unit

) and selecting New > Entity Class... (or New > Other... > Persistence > Entity Class and clicking ... the [Provider and Database] step just click Finish to generate a default persistence.xml file with a default persistence unit (that will be configured later). If the Finish button is disabled
Tutorial
46

Step 2: Entity Class and Persistence Unit

) and selecting New > Entity Class... (or New > Other... > Persistence > Entity Class and clicking ... the [Provider and Database] step click Finish to generate a default persistence.xml file with a default persistence unit (that will be configured later). If the Finish button is disabled
Tutorial
45

Step 2: Entity Class and Persistence Unit

.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity ... ; // Persistent Fields: @Id @GeneratedValue Long id; private String name ... guests in the database. We also need to configure JPA by setting a META-INF/persistence.xml file