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Building Java Enterprise Applications Volume I: Architecture phần 7

Tham khảo tài liệu 'building java enterprise applications volume i: architecture phần 7', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Building Java Enterprise Applications Volume I Architecture public float getBalance int accountId throws RemoteException return getAccount accountId .getBalance private Account getAccount int id try Get an InitialContext Context context new InitialContext Look up the Account bean AccountHome accountHome AccountHome context.lookup java comp env ejb AccountHome Account account accountHome.findByPrimaryKey new Integer id return account catch Exception e Any problems - just return null return null This is all basic EJB material and shouldn t cause you any problems. You ll notice that this class also uses a new finder method on the Account bean public Collection findByUserId Integer userId throws FinderException RemoteException The accompanying query element in the Account bean s entry in the ejb-jar.xml descriptor would look like this query query-method method-name findByUserId method-name method-params method-param java.lang.Integer method-param method-params query-method ejb-ql CDATA WHERE userLocal.id 1 ejb-ql query To deploy the AccountManager bean you would use this additional XML entry in your ejb-jar.xml deployment descriptor session description This AccountManager bean allows administration of Forethought accounts. description ejb-name AccountManagerBean ejb-name home com.forethought.ejb.account.AccountManagerHome home remote com.forethought.ejb.account.AccountManager remote ejb-class com.forethought.ejb.account.AccountManagerBean ejb-class session-type Stateful session-type transaction-type Container transaction-type 157 Building Java Enterprise Applications Volume I Architecture ejb-ref ejb-ref-name ejb AccountHome ejb-ref-name ejb-ref-type Entity ejb-ref-type home com.forethought.ejb.account.AccountHome home remote com.forethought.ejb.account.Account remote ejb-link AccountBean ejb-link ejb-ref session Additions to your application server s vendor-specific descriptors should be equally simple. With this bean in stateful form ready for use it s time to see .