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The bean runs outside the context of a transaction. Existing transactions are suspended during method calls. The bean cannot be invoked within a transaction. An existing transaction is suspended until the method called in this bean completes. Method calls require a transaction context. If one already exists, it will be used; if one does not exist, it will be created. The container starts a new transaction if no transaction exists. If a transaction exists, the bean uses that transaction. Method calls use the current transaction context if one exists but don t create one if none exists. The container will not start a new transaction. If a transaction already exists, the bean will be included in that transaction. Note that with this attribute, the bean can run without a transaction. Containers create new transactions before each method call on the bean and commit transactions before returning. A new transaction is always started when the bean method is called. If a transaction already exists, that transaction is suspended until the new transaction completes.
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Method calls require a transaction context. If one does not exist, an exception is thrown. An active transaction must already exist. If no transaction exists, the javax.ejb.TransactionRequired exception is thrown. Method calls require that no transaction context be present. If one exists, an exception is thrown. The bean must never run with a transaction. If a transaction exists, the java.rmi.RemoteException exception is thrown.
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With respect to transaction attributes, you should use Required for the default transaction attribute. The RequiresNew attribute is useful when the bean methods need to commit unconditionally. The NotSupported attribute can be used when the resource manager is not supported by the JEE product. The BluePrint recommends not using the attribute Supports. Mandatory and Never can be used when it is necessary to verify the transaction is associated with the client.
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Transaction Guidelines in EIS
For proper handling of transactions within the EIS integration tier, it is recommended that a component uses JTA whenever possible when accessing EIS systems. Using JTA transaction allows multiple components accessing EIS to be grouped in a single transaction. If a component marks the transaction as rollback only, all EIS work will be rolled back automatically. With local transactions, each EIS accessed will have to be committed or rolled back explicitly. In addition, components need extra logic to deal with individual EIS rollbacks or failures. To handle a group of EIS operations to work as a transaction, you might need compensating transactions. For example, in an identity management system, let s say that when a new user starts his job, EJBs are used to create a Windows NT ID, a UNIX ID, and a mainframe ID. We want this group of provisioned applications to be a transaction. Suppose the NT and UNIX IDs are created but the mainframe fails; we need to compensate or undo the transactions for the NT and UNIX IDs. A compensating transaction is a transaction, or group of operations, used to undo the effect of a previously committed transaction. They are useful if a component needs to access an EIS that does not support JTA. A number of problems can arise when using compensating transactions: It is not always possible to undo the effect of a committed transaction, and the required atomicity could be broken if the server crashes when a compensating transaction is used. In addition, database locks notwithstanding, inconsistent data might be seen by concurrent EIS access.
4: Applicability of JEE Technology
EXERCISE 4-10 Security Guidelines
Question Describe security guidelines, terminology, and forms of authentication. Answer A good security guideline is to provide a consistent end-to-end security architecture. This is accomplished by seamlessly integrating with existing security environments such as EIS 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. With respect to 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. An authentication mechanism is one by which callers and service providers prove that they are acting on behalf of specific users or systems. Good web-tier authentication can consist of HTTP basic authentication, form-based authentication, and HTTPS mutual authentication for transactions that need added security for sensitive data.
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