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To control access to web resources, specify the constraint in the deployment descriptor. To control access to EJB resources, specify the roles in the deployment descriptor. You can also specify the methods of the remote and home interface that each security role is allowed to invoke. The proper assignment of users to roles determines whether a resource is protected. To ensure message integrity, the following measures can be used:
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n Message signature
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A cryptographically enciphered message digest of the Ensures message authentication is useful only once
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message contents
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Message signatures might be required for component-to-component invocations that traverse unprotected networks. Specify message protection only for critical messages and components in the deployment descriptor.
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A transaction is a bracket of processing that represents a logical unit of work; it is an all-or-nothing contract, and all of the processing must be completed or else the transaction management should restore the application to the status quo ante as it was before the transaction. Transactions are basically a specific sequence of operations on resources, typically the data actions select, insert, and update, which
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transform the system from one consistent state to another. To reflect the correct state of the system, a transaction should have the following properties:
n Atomicity
This is the all-or-nothing property. Either the entire sequence of operations is successful or the sequence is entirely unsuccessful. Completed transactions are committed. Partially executed transactions are rolled back. A transaction maps one consistent state of the resources to another. Consistency is concerned with correctly reflecting the reality of the state of the resources. A transaction should not reveal its results to other concurrent transactions before it commits. Certain isolation levels (serialization) assure that transactions do not access data that is being concurrently updated. The results of the committed transactions are permanent. Resource managers ensure that the results of a transaction are not altered due to system failures.
n Consistency
n Isolation
n Durability
Transactions ensure data integrity by controlling access to data. This frees an application programmer from the complex issues of failure recovery and multiple-user programming. Transactions are a mechanism used for simplifying the development of distributed multiuser enterprise applications. Two types of transaction demarcation can be used: bean-managed and container-managed. In container-managed transaction demarcation, six different transaction attributes Required, RequiresNew, NotSupported, Supports, Mandatory, and Never can be associated with an enterprise bean s method.
Transaction Guidelines in the Web Tier
A servlet or JSP can use JNDI to look up a UserTransaction and use the Java Transaction API (JTA) to demarcate transactions. A servlet should start a transaction only in its service method. A transaction should not span multiple web requests. It is typically bracketed by a begin and a commit or rollback, as the following code snippet illustrates.
Context ic = new InitialContext();UserTransaction t =(UserTransaction)ic.lookup("java:comp/UserTransaction");t.begin(); // perform processingif (everything_worked){t.commit();}else{t.rollback();}
In a multi-tier environment, when using EJB, the use of JTA in the web tier is not recommended. In bean-managed transaction demarcation, the EJB bean uses UserTransaction. Only session beans can choose to use bean-managed transactions.
4: Applicability of JEE Technology
In container-managed transaction demarcation, the EJB container is responsible for transaction demarcation. Moreover, you should use container-managed transaction demarcation because it is less prone to error, and you should let the container handle transaction demarcation automatically. It frees the component provider from writing transaction demarcation code in the component. It is easier to group enterprise beans to perform a certain task with specific transaction behavior. The bottom line is that the application assembler can customize the transaction attributes in the deployment descriptor without modifying the code.
EJB Tier Container-Managed
Transaction demarcation is the vehicle by which transaction behavior of EJB is specified declaratively; it frees the developer from writing code. It is less error-prone because the container handles all the transaction servicing. It is easier to compose multiple enterprise beans to perform a certain task with transaction behavior. It can result in improved performance. A transaction attribute supports declarative transaction demarcation and conveys to the container the intended transactional behavior of the associated EJB component s method. Six transactional attributes are possible for container-managed transaction demarcation:
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