Ing. Ignacio Roqueta ARTech GeneXus and J2EE

Is GeneXus J2EE?

J2EE Java 2 Platform, Enterprise Edition Specification defined by Sun to run applications in application servers It defines APIs group Servlets JSP (Java Server Page) JDBC (Java Database Connectivity) EJB (Enterprise Java Beans) JNDI (Java Naming and Directory Interface) JMS (Java Messaging Service) JTA (Java Transaction API) Java 2 Platform, Enterprise Edition Specification defined by Sun to run applications in application servers It defines APIs group Servlets JSP (Java Server Page) JDBC (Java Database Connectivity) EJB (Enterprise Java Beans) JNDI (Java Naming and Directory Interface) JMS (Java Messaging Service) JTA (Java Transaction API)

J2EE 2 agents J2EE Application Servers J2EE Applications 2 agents J2EE Application Servers J2EE Applications

J2EE Application Servers They implement J2EE specification They provide a framework to run applications Examples Oracle Application Server WebLogic Websphere Sun One JRun Jboss Iplanet They implement J2EE specification They provide a framework to run applications Examples Oracle Application Server WebLogic Websphere Sun One JRun Jboss Iplanet

J2EE Applications Applications that run within a J2EE application server Web application (WAR) Enterprise java beans applications (JAR) Enterprise applications (EAR) Applications that run within a J2EE application server Web application (WAR) Enterprise java beans applications (JAR) Enterprise applications (EAR)

J2EE Compatible? J2EE compatible Applications Server When it meets the entire J2EE specification Sun certifies an application server as J2EE compatible J2EE compatible Application When it runs within a J2EE server J2EE compatible Applications Server When it meets the entire J2EE specification Sun certifies an application server as J2EE compatible J2EE compatible Application When it runs within a J2EE server

Web GeneXus Java Applications They use Servlets JDBC JNDI Deployment for J2EE servers War Deployment They use Servlets JDBC JNDI Deployment for J2EE servers War Deployment

GeneXus is J2EE

J2EE Compatible? J2EE and EJBs A J2EE application does not have to use EJBs Is GeneXus J2EE? <> Does GeneXus implement EJBs? J2EE and EJBs A J2EE application does not have to use EJBs Is GeneXus J2EE? <> Does GeneXus implement EJBs?

Enterprise java beans Reusable component that runs in a J2EE server They implement Business logic Access to database They run within container with middleware services Security Load balance Persistency Pool They may be used locally or remotely Reusable component that runs in a J2EE server They implement Business logic Access to database They run within container with middleware services Security Load balance Persistency Pool They may be used locally or remotely

Enterprise java beans types Entity beans They model business data Session beans They model business logic Stateful Stateless Message-driven beans They model business logic They are asynchronically called Entity beans They model business data Session beans They model business logic Stateful Stateless Message-driven beans They model business logic They are asynchronically called

Enterprise java beans types What will we generate? Session beans Stateless Message-driven beans What will we generate? Session beans Stateless Message-driven beans

Implementation Main procedures with call protocol Enterprise java bean Session bean steteless Message driven Bean Business component Session beans stateless Interface may be local, remote or both EAR Deployment It can be called from GeneXus or from external applications ¿Session beans stateful? Data cache Paging Call external EJBs Remote objects shown as EJBs (Rocha) Main procedures with call protocol Enterprise java bean Session bean steteless Message driven Bean Business component Session beans stateless Interface may be local, remote or both EAR Deployment It can be called from GeneXus or from external applications ¿Session beans stateful? Data cache Paging Call external EJBs Remote objects shown as EJBs (Rocha)

Demo Bank Account Application Bank Account Id Owner Balance 4 EJBs Local getOwner getBalance ModifyBalance Remote Transfer It uses getBalance and ModifyBalance Bank Account Application Bank Account Id Owner Balance 4 EJBs Local getOwner getBalance ModifyBalance Remote Transfer It uses getBalance and ModifyBalance

Summary GeneXus Java Web applications run in J2EE servers  GeneXus is J2EE Being J2EE does not imply using EJBs EJBs will be generated in the next version GeneXus Java Web applications run in J2EE servers  GeneXus is J2EE Being J2EE does not imply using EJBs EJBs will be generated in the next version

Any question?