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Staff representatives The personnel throughout the organization who are responsible for carrying out daily operations Management representatives The management level personnel who are responsible for approving business decisions within the organization

When several enterprise beans in a transaction use the same resource, you will want to configure your EJB server to share that resource. Sharing a resource means that each EJB will use the same connection to access the resource (e.g., database or JMS provider), a strategy that is more efficient than using separate resource connections. In terms of a database, EJBs that are referencing the same database will probably want to use the same database connection during a transaction so that all create, read, update, and delete (CRUD) operations return consistent results. EJB containers share resources by default, but resource sharing can be turned on or off explicitly with the shareable() attribute of the @Resource annotation. Occasionally, advanced developers may run into situations where resource sharing is not desirable, and having the option to turn off resource sharing is beneficial. But unless you have a good reason for turning off resource sharing, we recommend that you accept the default shareable() setting of true.

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The design team members selected for each panel must be willing and be permitted to commit their time and talents throughout the design process to ensure that the infra structure design effectively meets the requirements of their organization.

Figure 1-3

After you ve assembled a design team, the next design tools you need to assemble are analyses of your organization s business and technical environments. An analysis of an organization s business environment defines how it organizes and manages its nontechnical resources, such as its products and customers, business structure, business processes, company strategies, and the information technology (IT) management orga nization. An analysis of an organization s technical environment defines how it orga nizes and manages its technical resources, such as its network architecture, hardware, software, technical standards, DNS environment (if applicable), and Windows NT envi ronment (if applicable). Most often, your organization will have a business infrastructure or network already in place; it s up to you as an infrastructure designer to call on members of the design team to help you assemble documentation about these environments.

Resource environment entries are objects that do not fall into the resource reference category. Some resources may have other, additional administered objects that need to be obtained from the JNDI ENC or injected into your bean class. An administered object is a resource that is configured at deployment time and is managed by the EJB container at runtime. They are usually defined and deployed by a JCA resource adapter. Besides administered objects, resource environment entries are also used to reference services such as javax.transaction.UserTransaction and javax.transaction.TransactionSynchronizationRegistry. To obtain a reference to one of these services, the @Resource annotation can be used. When using this annotation, the authenticationType() and shareable() attributes are meaningless and are illegal even to specify.

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