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Figure 3-20. Menu settings that apply to all menus are accessed at Structure Menus Settings. The Source for Main links setting is used by many themes to determine which menu it should use as the main menu. Any menu can be used as the source for main links, which depending on your theme may be displayed as a page element. The Source for Secondary links is much the same; any menu can be used, and your theme may display it as a page element. However, an advanced option allows you to set the

6. Click New Sample Data. 7. When the New Sample Data dialog box pops up, give the data source a name of

14.8 Summary

This chapter examined the major issues related to interoperability, compatibility, and migration to EJB 3. The EJB 3 specification requires backward compatibility with EJB 2. You learned how you can mix-and-match EJB 2 and EJB 3 components in the same applications, as well as convert applications completely over to EJB 3. We provided guidelines for migrating each EJB 2 component to EJB 3. Migration of session beans and MDBs to EJB 3 is easy but still requires you to carefully plan the process because client applications may break due to changes in the client view of EJBs between EJB 2 and EJB 3. Migration of CMP entity beans is the most difficult task, but you can simplify the migration if you use design patterns such as DTO, Session Fa ade, and DAO. This chapter also explained how to convert JDBC DAOs to use the EJB 3 JPA. Finally, you saw that the migration from using existing O/R mapping frameworks to using the EJB 3 JPA is a very straightforward task. With these guidelines and a good knowledge of your applications, you will have no problem migrating your applications to use EJB 3. In the next chapter, you ll learn how to expose EJBs as web services, and how to invoke web services from EJB applications.

LBDataSource and then click OK, as shown in Figure 4-12.

Service-oriented architecture (SOA) and web services are no longer buzzwords These technologies have become a reality in the past few years Web services are definitely the new industry standard for application-to-application (A2A) and business-to-business (B2B) integration What do web services have to do with EJB 3 Exposing your business logic component as web service is a snap with EJB 3 Stick with us through this chapter and we ll demonstrate how EJB 3 can be combined with web service metadata to provide compelling solutions for exposing business logic as web services Let s illustrate this with another scenario from the ActionBazaar application The promoters of ActionBazaar are being forced to expose some components as web services because their competitors now offer competing services ActionBazaar wants to stay competitive, and needs to quickly enable their business functionality in a way that users of the system can easily consume.

source for main links and secondary links to the same menu. If you do this, then the secondary menu will display any links nested under an active link. For example, say your menu looks like this:

At first, they thought they might have to move to the Microsoft NET platform to create the web services When you consider that J2EE 14 was criticized by many for its complexities in building service-oriented applications, it s easy to see why the caretakers of ActionBazaar were considering that move They heard rumors that the developers of KabadiBazaar,1 a sister web auction site similar to ActionBazaar that specializes in miscellaneous household items, had demonstrated how it was easy to build web services with NET The promoters of ActionBazaar are hesitant, though, because they are enthusiastic about the simplification of web service development brought to Java by using metadata annotations and the Java API for XML -Based Web Services (JAX-WS) 20 specification In the end, they have decided to create their web services using EJB.

8. On the Data tab, click the little arrow next to LBDataSource and then click Collection. 9. Click the Edit sample values button, as shown in Figure 4-13.