Design and implement Servlets, JSPs, and EJBs for IBM by Joaquin Picon; et al

By Joaquin Picon; et al

This IBM redbook presents layout directions for constructing e-business functions in accordance with servlets, JavaServer Pages (JSP) and firm JavaBean (EJB) applied sciences. the tips are according to WebSphere software Server complex variation. The redbook describes the options of workload balancing by utilizing a community dispatcher and clones of the applying Server. The redbook proposes a layout of net functions according to layout styles, resembling the model-view-controller paradigm and the command framework. during this context, using firm beans, together with entry beans, institutions, and collections is explored intimately, and a collection of EJB-based layout styles is defined. half 1, "Choosing acceptable internet technollogies" presents guidance on easy methods to layout particular elements of an software. It additionally explains why and whilst a dressmaker should still flow company common sense from JavaBeans to a extra robust know-how like firm JavaBeans. half 2, "Design styles and instructions" is a suite of layout styles for construction e-business functions. Readers can use the knowledge at once from a bankruptcy and follow it of their personal designs

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Extra resources for Design and implement Servlets, JSPs, and EJBs for IBM WebSphere Application Server

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There is no perfect answer to the trade-off between good interface design and a reduced communication overhead. Our proposal is, that the requesting tier (the servlet) of a communication has to design the commands exactly to support its tasks. The idea is, that a servlet should only execute one command per invocation which encapsulates all of the controller function except for the HTTP request parsing. That means when implementing an e-business application, the servlet only interprets the HTTP request and executes commands.

We define a stateless entity bean as an entity bean conforming to the EJB specification, but without having any persistent attributes. Even the primary key is not persistent. Object o) { if (! EntityContext entityContext = null; public int dummy = 0; // All EJB specific methods must be defined ... 1 rules for * exception handling. If your business logic * throws a CommandException and wants to cause * the transaction to rollback, it must call * setRollbackOnly() on the bean's EJB context * before throwing the exception.

1 Commands A good way to solve the above problems and a good way to separate the program logic is by the use of commands. Commands encapsulate business logic tasks and provide a standard way to invoke the business logic request and access to data using a single round-trip message. A command is a stylized Java class with the following characteristics: • A command object corresponds to a specific business logic task, such as a query or an update task. • A command has a simple, uniform usage pattern.

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