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For the order-management application, two such joinpoints are included: The joinpoint in the addItem method where items is read in order to call the put method The joinpoint in the computeAmount method where items is read in order to call get In certain situations, it can be useful to restrict this set to contain only one joinpoint The withincode keyword, associated with a method name, can be used for this purpose The method name can contain wildcards (*, ., and +) The expression withincode(expr) will return true if the name of the method containing the joinpoint matches expr The expression get( * aop.*items ) && !withincode( * aop.*computeAmount(.) ) designates all the read operations for the items field that are not defined in the computeAmount method The use of || instead of && in the previous expression does not lead to the expected result.

To perform efficient and maintainable authorization, it is best if you can organize users into some kind of grouping Otherwise, each resource must have an associated list of all the users that can access it In a nontrivial system, this would easily become an administrator s nightmare To avoid this problem, users are organized into groups and groups as a whole are assigned access to resources, making the access list for an individual resource much more manageable The concept of role is closely related to the concept of group, but is a bit tricky to understand For an EJB application, roles are much more critical than users and groups To understand the distinction, consider the fact that you might not be building an in-house solution but a packaged Java EE application.

public class MessageBean implements MessageDrivenBean, MessageListener { private MessageDrivenContext ctx; public void onMessage(Message msg) { MapMessage map=(MapMessage)msg; try { String role = map.getString( "UserRole" );

Consequently, you might not know the exact operational environment your application will be deployed in once it is purchased by the customer As a result, it s impossible for you to code for the specific group names a customer s system administrator will choose Neither should you care about groups What you do care about is what role a particular user in a group plays for your application In the customer system, user Joe might belong to the system group called peons Now assume that an ActionBazaar integrated B2B Enterprise Purchasing System is installed on the customer s site Among other things, this type of B2B installation transparently logs in all existing users from the customer system into the ActionBazaar site through a custom desktop shortcut Once logged in, from ActionBazaar s perspective, Joe could simply be a buyer who buys items online on behalf of the B2B customer company.

To another small application in the operational environment, user Joe might be an administrator who changes system-wide settings For each deployed application in the operational environment, it is the responsibility of the system administrator to determine what system group should be mapped to what application role In the Java EE world, this is typically done through vendorspecific administrative interfaces As a developer, you simply need to define what roles your application s users have and leave the rest to the assembler or deployer For ActionBazaar, roles can be buyers, sellers, administrators, and so on Let s solidify our understanding of application security in EJB using an ActionBazaar example..

System.out.println("Received Message for Role: " + role); ProcessTheMessage( message ); } catch(Exception ex) { ex.printStackTrace(); } } }

Indeed, !withincode(* aop.*computeAmount(.)) is true for any joinpoint that is not in the computeAmount method The evaluation of the expression with the logical OR operator is thus true for these joinpoints, and the pointcut intercepts more joinpoints than expected In sum, no truly useful situation requires the joint usage of || and withincode..

At ActionBazaar, customer service representatives (CSRs) are allowed to cancel a user s bid under certain circumstances (for example, if the seller discloses something in answer to an e-mail question from the bidder that should have been