iSeries Access for Web V5R2 and WebSphere Host Publisher V4.0

142 iSeries Access for Web V5R2 and WebSphere Host Publisher V4.0

6.1 Overview of Host Publisher applications

Applications built in Host Publisher Studio contain Integration Objects. Integration Objects are

JavaBeans that encapsulate interactions with a data source, such as a database or a 5250

application. Then they return specific data from that source for use as output to Web pages,

Enterprise JavaBean (EJB) applications, J2EE application clients, or Java thin application

clients. Integration Objects connect to the data source, navigate to the desired data, extract

the data, and store the data in properties of the Integration Object, which can then be

accessed by JavaServer Pages (JSPs). See Figure 6-1.

Figure 6-1 IBM WebSphere Host Publisher

A J2EE application is packaged as an Enterprise Archive (EAR) file. The EAR file includes

everything necessary to run the application on Host Publisher Server. The elements that

make up the EAR file cannot be shared with other applications on the server. However, Host

Publisher Studio allows some elements created for one application to be reused in the

creation of other applications. When the application is built, a copy of the reused element is

included in the application’s EAR file. See Figure 6-2.

Chapter 6. Using Host Publisher Studio to develop J2EE applications 143

Figure 6-2 J2EE packaging

In a Host Publisher application, the elements that make up the EAR file include Integration

Objects, JSP pages, and support files.

The following steps show the sequence for creating and building a J2EE application in Host

Publisher Studio:

1. Create an Integration Object in Host Publisher Studio to access a data source and return

the desired data. See 6.2, “Integration Objects” on page 144.

2. Build Web pages that use one or more Integration Objects to form a Web application. See

6.5, “Application Integrator” on page 183.

3. Transfer the Web application to one or more Host Publisher Servers. See 6.5.3,

“Transferring applications to a Host Publisher Server” on page 196.

4. Deploy (install) the application using the WebSphere Administrative Console. For more

information, refer to the WebSphere documentation at:

http://www-1.ibm.com/servers/eserver/iseries/software/websphere/wsappserver/docs/doc.htm

You should also see 6.5.4, “Deploying the application on WebSphere Application Server”

on page 199.

Host Publisher Studio is also used to create Integration Objects that run remotely. The two

ways to do this are:

 Create J2EE EJB-based applications. The Web module containing the EJB access beans

can be deployed separately from the EJB module, which runs Integration Objects located

on the Host Publisher system. See 6.7, “Enterprise JavaBeans support” on page 207, for

details.

 Create Integration Objects that take advantage of Web Services function provided by

WebSphere Studio tools at the 4.0.2 level or above, such as WebSphere Studio

Application Developer. With the Web Services function, your Integration Objects can