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@Stateful @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED) public class ManageAuctionBean implements ManageAuction { @PersistenceContext(type = PersistenceContextType.EXTENDED) EntityManager em; public Item getAuction(Long itemId) { return em.find(Item.class, itemId); } public boolean sellerHasEnoughMoney(User seller) { boolean sellerCanAffordIt = (Boolean) em.createQuery("select...").getSingleResult(); return sellerCanAffordIt; } @Remove @TransactionAttribute(TransactionAttributeType.REQUIRED) public void endAuction(Item item, User buyer) { // Set winning bid // Charge seller // Notify seller and winner item.setBuyer(...); } }

The Sales group has the Read permission for the Sales subfolder because when shared folder permissions are combined with NTFS permissions, the more restrictive permission applies.

2. In the second example, the Users folder contains user home folders. Each user home folder contains data accessible only to the user for whom the folder is named. The Users folder has been shared, and the Users group has the shared folder Full Control permission for the Users folder. User1 and User2 have the NTFS Full Control permission for their home folder only and no NTFS permissions for other folders. These users are all members of the Users group. What permissions does User1 have when he or she accesses the User1 subfolder by making a connection to the Users shared folder What are User1 s permissions for the User2 subfolder

In this implementation, you switch to a different default for all methods, TransactionAttributeType.NOT_SUPPORTED, and require a transaction only for the endAuction() method. This last transaction also flushes the persistence context at commit time. All methods that now call the EntityManager without transactions are effectively running in autocommit mode, which we discussed in the previous chapter. Complex transaction assemblies You ve now used a few different TransactionAttributeType annotations; see the complete list of available options in Table 11.1. The most commonly used transaction attribute type is REQUIRED, which is the default for all stateless and stateful EJB methods. To disable automatic flushing of the extended persistence context for a method in a stateful session bean, switch to NOT_SUPPORTED or even NEVER.

User1 has the Full Control permission for the User1 subfolder because both the shared folder permission and the NTFS permission allow Full Control. User1 cannot access the User2 subfolder because she or he has no NTFS permission to gain access to it.

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EJB 3.0 declarative transaction attribute types Description A method must be invoked with a transaction context. If the client doesn t have a transaction context, the container starts a transaction and enlists all resources (datasources, and so on) used with that transaction. If this method calls other transactional components, the transaction is propagated. The container commits the transaction when the method returns, before the result is send to the client. If a method is invoked within the transaction context propagated from the client, the caller s transaction is suspended and reactivated when the method returns. If the caller has no transaction context, no transaction is started for the method. All used resources aren t enlisted with a transaction (autocommit occurs). If a method is invoked within the transaction context propagated from the client, it joins that transaction context with the same result as REQUIRED. If the caller has no transaction context, no transaction is started, with the same result as NOT_SUPPORTED. This transaction attribute type should be used only for methods that can handle both cases correctly. A method is always executed inside a new transaction context, with the same consequences and behavior as with REQUIRED. Any propagated client transaction is suspended and resumes when the method returns and the new transaction is completed. A method must be called with an active transaction context. It then joins this transaction context and propagates it further, if needed. If no transaction context is present at call time, an exception is thrown. This is the opposite of MANDATORY. An exception is thrown if a method is called with an active transaction context.

You use the System Properties dialog box (available in the Control Panel window) to configure operating system settings. These system settings affect the operating system environment regardless of which user is logged on to the computer.

Configure system performance options. Create, modify, and manage user profiles. Configure startup and recovery settings. Configure environmental variables. Configure error reporting.

You have to be aware of the transaction- and persistence-context propagation rules when you design your conversations with stateful EJBs, or if you want to mix stateless and stateful components: