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Accept all cookies Customize settings. Project dependencies and the Eclipse build paths will not be preserved, and may need to be reconfigured within the Rational environment. As part of the migration to Rational, your existing source trees will not have to be modified if they follow the J2EE packaging structure. Rational tools are different from other development environments and you should expect that it will require some time for developers to fully develop the skills required to work effectively with the product.
Even really bright people should receive training for IBM Rational Web or Application Developer to fully leverage the significant power the products can provide.
Typically, five days of classroom training is sufficient for application developers who are already familiar with enterprise application development. While many of the concepts are similar, the details are very different. It may take time for your operations staff to learn about WebSphere Application Server and understand how to configure and manage it.
Existing scripts that you may have used to manage Community Edition will need to be rebuilt to work with WebSphere Application Server. Managing a collection of WebSphere Application Server nodes is still a task that requires dedicated administrators with specialized skills.
Even skilled administrators will benefit from formal training. Typically, five days of classroom training is enough to arm seasoned application server administrators with the information they need to install, configure and maintain WebSphere Application Server. As long as the applications abide by the J2EE specification there will not be significant change required in your application code as part of the migration. For the most-part, application code that is "just Java" should just work on both products.
Chances are that most of your control and business logic falls into this category. Most of your Java code should migrate without change. J2EE defines a very specific packaging structure that separates the various artifacts into different archives.
Figure 5 shows how the various archives also referred to as modules in J2EE documentation are organized. There is an XML deployment descriptor packaged with each module. The deployment descriptor describes the organization of the components in the module and how they are configured at run time. Within these project types, a particular directory structure is also required. A Web project must, for example, contain a Web content directory that contains all the content for the project everything except source code.
If the code is structured in such a way for the build process to bundle the different modules into J2EE artifacts, then the implications might be that existing code organization will have to be changed as a part of the migration effort. All applications require standard J2EE deployment descriptors as web. In addition to these, there are also application server specific deployment descriptors that some applications will need to run within the container.
The application server specific deployment descriptors do not conform to any standards and hence they vary between the J2EE container implementations.
The extended deployment descriptors also referred to as deployment plan in the Geronimo world provide more information about the application to the container.
Any number of security realms can be configured and each application module has to specify in its deployment plan the name of the security realm to be used. This limits the ability to do single sign on and identity propagation to downstream servers. The security realms are enforced using JAASLoginModules, which provides the capabilities of prompting the user for username and password, and for creating the JAAS subject with the principal for that user. All the security realms are configurable via deployment plan.
Information on Geronimo security will also apply to Community Edition. WebSphere Application Server provides a default security realm that can be set and used for the entire server. The same realm can be shared between WebSphere administration and for application security authentication and authorization.
The security realms are enforced by means of four types of UserRegistry:. As the names indicate, the user registries are for disk based, LDAP, and local operating system authentication. The more complex security requirements can be addressed using the CustomUserRegistry. Further, if you have written your own JAASLoginModule, you can leverage the same within WebSphere Application Server by configuring them through the admin console or through using scripts.
Changes in the security implementation do not warrant any changes in the application code itself since they are all being enforced by the J2EE container using the JAAS standards. If all the JNDI lookups within the application are local context lookups contained within the same EAR , then this will not affect the application code.
WebSphere Application Server uses the context factory com. If you are using an external persistence mechanism such as Hibernate or iBatis , you will be able to retain the persistence model without any changes and run it within WebSphere Application Server by deploying the dependent libraries as a part of the application.
The code is givern below. NoInitialContextException: Cannot instantiate class: com. WsnInitialContextFactory [Root exception is java. ClassNotFoundException: com. WsnInitialContextFactory] finished import javax. If it hasn't, report this and throw an exception Connect and share knowledge within a single location that is structured and easy to search. I want this queue manager and its queues to be looked up through JNDI from a client running on another machine B.
After some investigations, I found out that com. WsnInitialContextFactory is really specific to Websphere application server. I tested directly in java Main class, probably that is why I always failed. You can then copy that file over to your EAP servers. The ". Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 4 years, 7 months ago. Active 4 years, 5 months ago.
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