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discussed the pattern called ServiceLocator).
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or Never transaction attributes (in the ejb-jar.xml deployment descriptor file). If the code calling a method in this bean has a transaction running, suspend that transaction until the method called in this bean completes. No transaction context is created for this bean.
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database rows. This depends on transaction isolation that is defined in terms of isolation levels called dirty reads, repeatable reads, and phantom reads.
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Security
A repeatable read is when the data read is guaranteed to look the same if read again during the same transaction. Repeatable reads typically means that the data read is locked against changes. If the data is locked, it cannot be changed by any other transaction until this transaction ends. A dirty read occurs when the first transaction reads uncommitted changes made by a second transaction. If the second transaction is rolled back, the data read by the first transaction becomes invalid because the rollback undoes the changes. The first transaction won t be aware that the data it has read has become invalid. Phantom reads occur when new rows added to the database are detectable by transactions that started prior to the insert. Queries will include rows inserted by other transactions after their transaction has started.
Security
Threats to enterprise-critical assets can include such events as disclosure of confidential information, the modification or destruction of information, the misappropriation of protected resources, the compromise of accountability, and misappropriation that compromises availability. Exposure to threats can be mitigated using software that provides authentication, authorization, and auditing. A good security guideline is to support consistent end-to-end security architecture. This is accomplished by integrating with existing security environments. This is known as identity management. Large firms have provisioning systems that manage user accounts across different application domains and operating systems. The proper security guidelines should support authentication and authorization. Another objective of good security is to be transparent to application components and enable applications to be portable across security environments. A good technique is to have the user identity passed from the calling application.
Security Terminology
An entity is something that can have access rights applied to it. A principal is an entity to which privileges can be assigned. A role is a collection of privileges. Authentication is a mechanism by which callers and service providers prove that they
4: Applicability of JEE Technology
are acting on behalf of specific users or systems. Web-tier authentication consists of HTTP basic authentication, form-based authentication, and HTTPS mutual authentication.
Authentication in the EJB and EIS Integration Tiers
The EJB tier authentication can be accomplished using protection domains, by placing a protected web resource in front of a protected EJB resource, or by linking protected web resources on every web resource that calls EJB resources. On the EIS integration tier, authentication can be accomplished using container-managed resource manager sign-on or an application-managed resource manager sign-on.
Protection Domains
In a JEE application, protection domain refers to a set of entities that are assumed, or known to trust each other. When a component interacts with components in the same protection domain, no constraint is placed on the identity that it associates with its call. The caller may propagate the caller s identity, or choose an identity based on knowledge of authorization constraints imposed by the called component, since the caller s ability to claim an identity is based on trust. If the concept of protection domains is employed to avoid the need for authentication, there must be a means to establish the boundaries of protection domains, so that trust in unproven identities does not cross these boundaries. In JEE, a container provides an authentication boundary between external callers and the components it hosts. Containers enforce the boundaries, and implementations are likely to support protection domains that span containers. A container is not required to host components from different protection domains, although an implementation may choose to do so.
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