|By Roland Barcia
|January 19, 2006 11:15 AM EST
In this article, WebSphere consultant Roland Barcia answers questions on developing J2EE and Web services applications on IBM Rational Application Developer V6 and deploying and testing those applications on WebSphere Application Server V6. Topics include using the various wizards, perspectives, and tools in Rational Application Developer to develop different types of J2EE applications, using the new Service Integration Bus Messaging Platform in WebSphere Application Server V6, differences from V5 of WebSphere Studio or WebSphere Application Server, using the default WebSphere Application Server V6 in Rational Application Developer, and deploying to full WebSphere Application Server V6 Network Deployment.
Question: We have the WebSphere 5.0 server only. I started to move our IDE from WebSphere Studio Application Developer 5.1.2 (hereafter called Application Developer) to Rational Application Developer (RAD) V6 to take advantage of some new features in RAD 6. I set the J2EE level to 1.3 and worked out a few issues: the EAR file generated from RAD 6 works fine in WebSphere Application Server 5 (hereafter called Application Server). But, we still have problems in RAD 6. For example, some error messages show up in the JSP fragment files. It seems the JSP compiler or validator in RAD 6 tries to compile those fragment files like a standalone files. I just wonder if it is a right choice to use RAD 6 to develop J2EE application running on a V5 server? Is it possible to make the JSP compiler in RAD 6 work the same way as in Application Developer 5.1.2 since we are targeting the V5 server?
Answer: WebSphere Studio Application Developer V 5.1.2 had the same issue, but the validation was probably off by default. I always tell people that validation should be off by default and executed on demand when needed. This improves the speed of your builds dramatically. You can turn off JSP validation at the Project level by right clicking the project and selecting properties (see Figure 1).
Or, you can turn it off at the workspace level by selecting Windows -> Preferences (see Figure 2).
For more tips on performance, see Rational Application Developer Performance Tips.
Question: How do we specify in WebSphere annotations if we want composers to be used for custom mappings of user types in CMP 2.x beans?
Answer: Currently, there are no annotations for composers in the current version.
Question: How to handle top down WSDL to Java round tripping? Now using iRAD so when modifying WSDL, I don't want to lose code in the service endpoint skeleton (where first level user code goes in Java). Don't want to use java2WSDL so as to maintain interoperable WSDL, given top down WSDL to Java is recommended. What are the options? Modifying/enhancing WSDL should be supported as a basic service lifecycle requirement. Have large number of teams requiring standards/guidance on how to manage changing service interfaces.
Can iRAD provide support? Past initial Java service class generation?
Are there any tools available? Should be able to track and not lose non-generated code.
Answer: Currently, there are no annotations or tools that you can use to avoid changes from not being overridden. You can use certain strategies:
- After the initial generation, use the bottom-up approach after that. Changes on an interface are usually driven by changes needed in the implementation.
- If you want to use top-down, make sure your generated skeleton code is just a pass through to another class. This way, all you have are minimal changes that are made through re-generation. You could probably write an ANT task or use the Design Pattern Toolkit to generate the call to the class.
- If you use the Service Integration Bus, you can use Inbound Services to expose destinations as Web services and have Mediations service the request. The Mediation Code will not be re-generated because they interact with Service Data Objects (SDO). For more information, see Service Integration Bus article series and Deploying JMS Applications and MDBs into the Service Integration Bus.
Is it possible to apply WebSphere Application Server Refreshment Pack onto WebSphere Application Server 6 test enviromnent within RAD6? I've applied RAD6 18.104.22.168 interim fix 3 to RAD6, but the test environment seems to stay at the original level (22.214.171.124), according to the \Rational\SDP\6.0\runtimes\base_v6\profiles\default\bin\versioninfo command.
Answer: Yes, going forward, you need to apply WAS fixpacks and refresh packs to the WebSphere Application Server Test Environment separately, as documented in Technote: Upgrading the WebSphere Test Environment V6 in Rational Application or Web Developer. The test environment in RAD is a full WebSphere Application Server Base edition. When installing WebSphere updates, WebSphere Application Server's root will be C:/<RAD_INSTALL_ROOT>/runtimes/base_v6.
Question: I am now looking into the features of RAD 6 and trying to test EJBs using the EJB component Test. But til now, I am not successful and getting into lot of issues. Do you have any document that explains how to test EJBs?
Answer: You can check the following resources:
- Component testing with IBM Rational Application Developer for WebSphere Software describes using the Test Component Feature.
- Essentials of IBM Rational Application Developer: Component Testing Features is a Web-based course.
- The Rational Software Development Platform Information Center has additional information.
Is there a mechanism to maintain data/record locking in the backend database when the end-user is working on the data accessed through a JSF/SDO (Service Data Objects) based Web client? If not, is there a mechanism to at least inform the client that the data he/she has accessed has changed while he/she was working on it.
Answer: Yes, you can supply an optimistic concurrency control (OCC) integer column to a given table, and specify that this column is to be used for OCC in the metadata. The defined OCC collision column is reserved for the exclusive use of the mediator. For more details, see JDBC mediator transactions.
- Is it possible to use Crystal Reports with WebSphere Portal 5.0? If not, what other reporting software would be suggested?
- Is it possible to use MySQL to develop CMP EJBs in RAD v6?
- Is it possible to use Crystal Reports with Cloudscape?
- Business Objects provides solutions for IBM WebSphere Portal by providing various portlets. For more information, see Business Objectives Enterprise Portlets.
- As long as you have a compliant JDBC driver, it could work. However, IBM provides support for the JDBC drivers listed in the Information Center. If your DB is not listed, you may want to talk to your IBM Representative.
- You need to check with Business Objects who makes Crystal Reports, for their official supported list of databases. For more information, see Crystal Report Features.
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