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access control), and secure communication. Enterprise applications handle these three areas with different mechanisms. For instance, users are presented with a JSP form and must enter a username and password (authentication); EJBs map users to security roles in order to access business methods (access control); and the application server provides a secure socket layer (SSL) for communication. EJBs are best suited for handling access control of clients. The EJB specification describes a system of specifying security roles that define the level of access to particular business methods and beans. This type of access control is a declarative security measure. Bean descriptors declare the roles that can access their methods, and the EJB container can map these logical roles to actual security realms within the application server. For example, when a user logs into a J2EE application, the application server matches the username to a security role called ADMIN. As the user attempts to execute code that performs a JNDI lookup of an EJB, the user s credentials (username and password) are passed to the EJB container. Before returning the bean, or before invoking bean methods, the container verifies that the user has sufficient access (as defined by the user s security role) to the bean. The recipes contained in this chapter deal directly with security roles and access control (as well as a few other unique recipes). For information about mapping users to roles within an application server, you should consult the documentation from your vendor. After reading this chapter, you will be familiar with the following topics:

} However, the use of a named pointcut descriptor is preferred because this produces programs that are clearer and easier to maintain Furthermore, when a pointcut descriptor is reused in several advice code blocks, the use of a name avoids useless, error-prone repetitions In the previous section, you learned that pointcut descriptors can accept parameters Hence, when used, the associated advice code must also be parameterized The example in Listing 3-10 reuses the toBeTraced2 pointcut descriptor with four parameters and associates the pointcut with before advice Listing 3-10 Defining Parameterized Pointcuts 1 pointcut 2 toBeTraced2( Customer src, Order dst, String ref, int qty ): 3 call( * **(.) ) && 4 this(src) && target(dst) && args(ref,qty); 5 before( Customer src, Order dst, String ref, int qty ): 6 toBeTraced2(src,dst,ref,qty) { 7 Systemoutprintln( 8 ".. before the joinpoints included in toBeTraced2 .."); 9 Systemout.

protected String name; protected Date modificationDate;

protected Set<Item> items; protected Category parentCategory; protected Set<Category> subCategories; public Category() {} public Long getId() { return this.id; } public void setId(Long id) { this.id = id; } public String getName() { return this.name; } public void setName(String name) { this.name = name; } public Date getModificationDate() { return this.modificationDate; }

Finding information about EJB clients Using client roles Passing client identity to EJBs Disabling EJB methods Using an EJB as a client Securing entity bean access Authenticating LDAP access Understanding message-driven bean security

public void setModificationDate(Date modificationDate) { this.modificationDate = modificationDate; } public Set<Item> getItems() { return this.items; } public void setItems(Set<Item> items) { this.items = items; } public Set<Category> getSubCategories() { return this.subCategories; }

println( src + " " + dst + " " + ref + " " + qty ); 10 } The four parameters that are defined in the pointcut descriptor are also used for the definition of the advice code (See line 6 in Listing 3-10) These parameters are then available for any instruction that is defined in the body of the advice code block..

public void setSubCategories(Set<Category> subCategories) { this.subCategories = subCategories; } public Category getParentCategory() { return this.parentCategory; }

Many business situations require that decisions be made based on which user starts a process. For instance, depending on the permission of a user, an EJB may decide to limit functionality or validate input in a different manner. For example, if a user does not have Administrator permissions, you may allow that user to view data but not make any changes. Each EJB should be able to determine the EJB client in order to make such decisions if necessary.

public void setParentCategory(Category parentCategory) { this.parentCategory = parentCategory; } }

The Category POJO b has a number of protected instance fields D E, each with corresponding setters and getters that conform to JavaBeans naming conventions F. In case you are unfamiliar with them, JavaBeans rules state that all instance variables should be nonpublic and made accessible via methods that follow the getXX and setXX pattern used in listing 7.1, where XX is the name of the property (instance variable). Other than name and modificationDate, all the other properties have a specific role in domain modeling and persistence. The id field is used to store a unique number that identifies the category C. The items property stores all the items stored under a category and represents a many-to-many relationship between items and categories. The parentCategory property represents a self-referential many-to-one relationship between parent and child categories. The subCategories property maintains a one-to-many relationship between a category and its subcategories. The Category class as it stands in listing 7.1 is a perfectly acceptable Java implementation of a domain object. The problem is that the EJB 3 persistence provider has no way of distinguishing the fact that the Category class is a domain object instead of just another random Java object used for business logic, presentation, or some other purpose. Moreover, note that the properties representing relationships do not make direction or multiplicity clear. Lastly, the persistence provider also needs to be told about the special purpose of the id property. We ll start solving some of these problems by using JPA annotations next, starting with identifying the Category class as a domain object.