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7: Enterprise JavaBeans and the EJB Container Model
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2007:EntityCMPBean:ejbStore() [primary key=40] 2007:EntityCMPBean:ejbStore() [primary key=50] 2007:EntityCMPBean:ejbStore() [primary key=60] 2007:EntityCMPBean:ejbStore() [primary key=10000] 2007:EntityCMPBean:ejbStore() [primary key=10001] 2007:EntityCMPBean:ejbStore() [primary key=10002] 2007:EntityCMPBean:ejbStore() [primary key=10003] 2007:EntityCMPBean:ejbStore() [primary key=10004] 2007:EntityCMPBean:ejbStore() [primary key=10005] 2007:EntityCMPBean:ejbLoad() [primary key=10] 2007:EntityCMPBean:ejbStore() [primary key=10] 2007:EntityCMPBean:ejbLoad() [primary key=20] 2007:EntityCMPBean:ejbStore() [primary key=20] 2007:EntityCMPBean:ejbLoad() [primary key=30] 2007:EntityCMPBean:ejbStore() [primary key=30] 2007:EntityCMPBean:ejbLoad() [primary key=40] 2007:EntityCMPBean:ejbStore() [primary key=40] 2007:EntityCMPBean:ejbLoad() [primary key=50] 2007:EntityCMPBean:ejbStore() [primary key=50] 2007:EntityCMPBean:ejbLoad() [primary key=60] 2007:EntityCMPBean:ejbStore() [primary key=60] 2007:EntityCMPBean:ejbLoad() [primary key=10000] 2007:EntityCMPBean:ejbStore() [primary key=10000] 2007:EntityCMPBean:ejbLoad() [primary key=10000] 2007:EntityCMPBean:ejbRemove() [primary key=10000] 2007:EntityCMPBean:ejbLoad() [primary key=10001] 2007:EntityCMPBean:ejbStore() [primary key=10001] 2007:EntityCMPBean:ejbLoad() [primary key=10001] 2007:EntityCMPBean:ejbRemove() [primary key=10001] 2007:EntityCMPBean:ejbLoad() [primary key=10002] 2007:EntityCMPBean:ejbStore() [primary key=10002] 2007:EntityCMPBean:ejbLoad() [primary key=10002] 2007:EntityCMPBean:ejbRemove() [primary key=10002] 2007:EntityCMPBean:ejbLoad() [primary key=10003] 2007:EntityCMPBean:ejbStore() [primary key=10003] 2007:EntityCMPBean:ejbLoad() [primary key=10003] 2007:EntityCMPBean:ejbRemove() [primary key=10003] 2007:EntityCMPBean:ejbLoad() [primary key=10004] 2007:EntityCMPBean:ejbStore() [primary key=10004] 2007:EntityCMPBean:ejbLoad() [primary key=10004] 2007:EntityCMPBean:ejbRemove() [primary key=10004] 2007:EntityCMPBean:ejbLoad() [primary key=10005] 2007:EntityCMPBean:ejbStore() [primary key=10005] 2007:EntityCMPBean:ejbLoad() [primary key=10005] 2007:EntityCMPBean:ejbRemove() [primary key=10005]
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A Closer Look at Entity Beans (Prior to EJB 3.0)
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This section provides a more in-depth look at the issues that need to be addressed when you re developing EJB component methods and configuration files.
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Primary Keys
As mentioned, primary key classes can map to either a single field or multiple fields of an entity bean. Single-field mappings are the simpler of the two cases. In this scenario, the primkey-field element in the deployment descriptor is used to specify which field specified by the container-managed element is to be used as the primary key. The primkey-field and the container-managed elements are required to be the same type. In mapping to multiple fields, the fields of the primary key class must be a subset of the container-managed fields. The primary key class, its parameterless constructor, and all primary key class fields are required to be declared as public.
The Unknown Primary Key Class If the choice of the primary key field or fields is to be delayed until deployment time, the findByPrimaryKey() method, always a single-object finder, must be declared as java.lang.Object. The prim-key-class element in the deployment descriptor must also be java.lang.Object. The isIdentical() Method Client applications can test to determine whether different object references are pointing to the same entity object by using the isIdentitcal() method. The following example uses this method:
// Get Home references CustomerRemoteHome custHome1 = (CustomerRemoteHome) javax.rmi.PortableRemoteObject.narrow( initialContext.lookup("java:ucny/um2z8/customers"), CustomerRemoteHome.class); CustomerRemoteHome custHome2 = (CustomerRemoteHome) javax.rmi.PortableRemoteObject.narrow( initialContext.lookup("java:ucny/um2z8/customers"), CustomerRemoteHome.class); // Get Remote references Customer customer1 = custHome1.findByPrimaryKey(100); Customer customer2 = custHome2.findByPrimaryKey(100); if (customer1.isIdentical(customer2)) System.out.println ("identical objects."); else System.out.println ("non-identical objects");
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