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Listing 12: Deployment descriptor for

findAll()

query

UserBean

UserBean

findAll

select Object(theUser) from UserBean as theUser

Also note that the finder method

findAll()

is defined using the query element. The

query element defines the method name, and method parameters in this case

findAll()

and no parameters. Note that the body of the ejb ql element defines the

actual query

select Object(theUser) from UserBean as theUser

. This

syntax is very similar to SQL.

Next I will demonstrate using the

findAll()

method from the session bean by

implmenting a

getUsers()

method.

Adding a

getUsers()

methods to the

UserManagementBean

To use the home interfaces

findAll()

method, you add a

getUsers()

method to

the

UserManagementBean

. The implementation of

getUsers()

in the

UserManagementBean

class calls the

findAll()

method. It then iterates through

the collection of

LocalUser

objects and puts their email property in an ArrayList. The

getUsers()

method cannot simply return the

Collection

sent by

findAll()

since

a local bean can not be sent remotely.

Listing 13: Interface for

getUsers()

/** Add the getUsers method to the interface */

public interface UserManagement extends EJBObject {

public Collection getUsers() throws RemoteException;

}

Page 44 of 48

Introducing EJB CMP/CMR, Part 1 of 2