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javaxpersistenceEntityManagerFactory References to managed resource factories (eg, javaxsqlDataSource) References to other EJBs The types in this list (and their subtypes) are handled specially by the passivation mechanism They do not need to be serializable; they will be maintained through passivation and restored automatically when the bean instance is activated When a bean is about to be passivated, a method on the bean class may be annotated with @PrePassivate to receive a callback for this event This can be used to alert the bean instance that it is about to enter the Passivated state At this time, the bean instance should close any open resources and set all nontransient, nonserializable fields to null This prevents problems from occurring when the bean is serialized Transient fields are simply ignored How does the container store the bean s conversational state It s largely up to the container.

The information displayed in the Effective Permissions tab is read-only. Therefore, you cannot change a user s permissions by selecting or clearing permission check boxes in this tab.

Summary

The following are the best practices for assigning permissions:

Containers can use standard Java serialization to preserve the bean instance, or some other mechanism that achieves the same result Some vendors, for example, simply read the values of the fields and store them in a cache The container is required to preserve remote references to other beans with the conversational state When the bean is activated, the container must restore any bean references automatically The container must also restore any references to the special types listed earlier When the client makes a request on an EJB object whose bean is passivated, the container activates the instance This involves deserializing the bean instance and reconstructing the SessionContext reference, bean references, and managed resource factories held by the instance before it was passivated When a bean s conversational state has been successfully restored, an @PostActivate callback method is invoked on the bean instance if one is declared on the bean class.

Because it is inefficient to maintain user accounts directly, you should assign permissions to groups rather than to users. Deny permissions sparingly. You should deny permissions only when it is neces sary to exclude a subset of a group that has allowed permissions, or to exclude one special permission when you have already granted full control to a user or group. If you assign permissions correctly, you should not need to deny permis sions. In most cases, denied permissions indicate mistakes that were made in assigning group membership.

VPN protocol selection depends on:

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The computer operating system and the organization s willingness to add cli ent software. The requirements for security level and speed of implementation. The existing certificate infrastructure or the ability to acquire one.

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The bean instance should open any resources that cannot be passivated and initialize the values of any transient fields within the @PostActivate method Once @PostActivate is complete, the bean is back in the Method-Ready state and is available to service client requests delegated by the EJB object The activation of a bean instance follows the rules of Java serialization, regardless of how the bean s state was actually stored The exception to this is transient fields In Java serialization, transient fields are set to their default values when an object is deserialized; primitive numbers become zero, Boolean fields false, and object references null In EJB, transient fields can contain arbitrary values when the bean is activated The values held by transient fields following activation are unpredictable across vendor implementations, so do not depend on them to be initialized Instead, use an @PostActivate callback method to reset their values.

sion. Failure to do so might result in some objects being inaccessible to the person using the Active Directory Users And Computers console, even an administrator, unless object ownership is changed.

VPN network infrastructure must be considered in the development of technical solutions. Particular attention must be paid to firewall and NAT server location and configuration. Network Access Quarantine Control can provide additional protection for networks that are remotely accessed. Trust infrastructure must support proposed VPN connections when certificates are required.

Standard permissions are assigned in the Security tab in the Properties dialog box for the object, which is accessed by using the Active Directory Users And Computers console. To assign standard permissions for an object, complete the following steps: 1. Click Start, point to Administrative Tools, and then click Active Directory Users And Computers. On the View menu, ensure that Advanced Features is selected. Right-click the object for which you want to assign permissions and click Properties.

The container can also move the bean instance from the Passivated state to the Does Not Exist state if the bean times out When a timeout occurs in the Passivated state, any @PreDestroy callback methods are not invoked..

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You must select Advanced Features on the View menu to be able to access the Security tab and assign standard permissions for an object.