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} catch (Exception e) { e.printStackTrace(); } } private static Context getInitialContext() throws Exception { // This implementation is specific to the Weblogic // server and will differ for other server vendors. String providerUrl = "t3://localhost:7001"; String icFactory = "weblogic.jndi.WLInitialContextFactory"; String user = null; String password = null; Properties properties = null; try { properties = new Properties(); properties.put(Context.INITIAL_CONTEXT_FACTORY, icFactory); properties.put(Context.PROVIDER_URL, providerUrl); if (user != null) { properties.put(Context.SECURITY_PRINCIPAL, user); properties.put(Context.SECURITY_CREDENTIALS, password == null "" : password); } return new InitialContext(properties); } catch(Exception e) { System.out.println( "Unable to connect to JNDI server at " + providerUrl); throw e; } } }
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Instantiating beans and calling increment()... Sat Jan 20 13:04:09 EST 2007 Sat Jan 20 13:04:10 EST 2007 Sat Jan 20 13:04:11 EST 2007 Sat Jan 20 13:04:12 EST 2007 Sat Jan 20 13:04:13 EST 2007 Calling increment() again. Sat Jan 20 13:04:14 EST 2007 Sat Jan 20 13:04:15 EST 2007 Sat Jan 20 13:04:16 EST 2007 Sat Jan 20 13:04:17 EST 2007 Sat Jan 20 13:04:18 EST 2007
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mySFSession[0].increment()=10 mySFSession[1].increment()=20 mySFSession[2].increment()=30 mySFSession[3].increment()=40 mySFSession[4].increment()=50 mySFSession[0].increment()=11 mySFSession[1].increment()=21 mySFSession[2].increment()=31 mySFSession[3].increment()=41 mySFSession[4].increment()=51
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7: Enterprise JavaBeans and the EJB Container Model
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Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 13:04:09 13:04:09 13:04:10 13:04:10 13:04:11 13:04:11 13:04:12 13:04:12 13:04:13 13:04:13 13:04:14 13:04:15 13:04:16 13:04:17 13:04:18 13:04:19 13:04:19 13:04:19 13:04:19 13:04:19 EST EST EST EST EST EST EST EST EST EST EST EST EST EST EST EST EST EST EST EST 2007:SFSessionBean:4039138 2007:SFSessionBean:4039138 2007:SFSessionBean:5775816 2007:SFSessionBean:5775816 2007:SFSessionBean:2897995 2007:SFSessionBean:2897995 2007:SFSessionBean:6664484 2007:SFSessionBean:6664484 2007:SFSessionBean:4034480 2007:SFSessionBean:4034480 2007:SFSessionBean:4039138 2007:SFSessionBean:5775816 2007:SFSessionBean:2897995 2007:SFSessionBean:6664484 2007:SFSessionBean:4034480 2007:SFSessionBean:4039138 2007:SFSessionBean:5775816 2007:SFSessionBean:2897995 2007:SFSessionBean:6664484 2007:SFSessionBean:4034480 ejbCreate(9) increment() ctr=9 ejbCreate(19) increment() ctr=19 ejbCreate(29) increment() ctr=29 ejbCreate(39) increment() ctr=39 ejbCreate(49) increment() ctr=49 increment() ctr=10 increment() ctr=20 increment() ctr=30 increment() ctr=40 increment() ctr=50 ejbRemove() ctr=11 ejbRemove() ctr=21 ejbRemove() ctr=31 ejbRemove() ctr=41 ejbRemove() ctr=51
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Using Entity Beans (Prior to EJB 3.0)
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An entity bean is an EJB that models data that is typically stored in a relational database management system (RDBMS). Usually, it exists for as long as the data associated with it exists. An entity bean is an object representation of data. An object is generally considered to be any entity with two specific attributes: state and functionality. Entity beans implement this criteria and are therefore considered objects. An entity bean contains a copy of persisted data; therefore, it has a state. It also contains business logic; therefore, it has functionality. With these properties, entity beans can provide the same types of benefits as those of object databases. Entity beans allow data to be persisted as Java objects as opposed to existing as rows in a table. They enable the enterprise bean provider to associate Java objects abstractly with relational database components (see Figure 7-5). Subsequently, the EJB deployer is able to map these abstract relational components to existing persistence devices.
Distinguish Between Stateful and Stateless Session Beans
FIGURE 7-5
Entity bean representing RDBMS-based data
Entity beans access relational databases as well as enterprise systems or applications used to persist data (see Figure 7-6). Entity beans are able to be written in a robust and object-oriented fashion so that they can be used with a variety of data sources or data streams. Entity beans are most often used for representing a set of data, such as the columns in a database table, with each entity bean instance containing one element of that data set, such as a row from a database table. Methods of the entity bean s home interface, as defined in the EJB specification, allow clients to read, insert, update, and delete entities in a database. Entity bean instances hold a copy of persisted data. If multiple clients execute the same find operation, for example, all of them will get handles to the same entity bean instance. Each client will get a handle to the same logical instance of the bean, but based on the transactional mode, each client could actually be talking to a different physical instance of the bean class. If contention exists between entity bean calls, it is handled by regarding each call as a separate transaction.
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