By Josh Juneau
Java EE 7 Recipes takes an example-based technique in exhibiting tips on how to software firm Java purposes in lots of diversified scenarios. Be it a small-business internet program, or an firm database program, Java EE 7 Recipes offers potent and confirmed ideas to complete almost about any activity that you could be encounter. You can believe convinced utilizing the trustworthy strategies which are established during this e-book on your own or company surroundings.
The ideas in Java EE 7 Recipes are outfitted utilizing the most up-tp-date Java firm necessities, together with EJB 3.2, JSF 2.2, Expression Language 3.0, Servlet 3.1, and JMS 2.0. While older applied sciences and frameworks exist, it is very important be forward-looking and benefit from all that the newest applied sciences provide. Rejuvenate your Java services to exploit the most up to date features, or maybe examine Java firm improvement for the 1st time and realize probably the most common and strongest structures to be had for software improvement this present day. allow Java EE 7 Recipes express you how through displaying tips on how to construct streamlined and trustworthy functions a lot quicker and more uncomplicated than ever prior to through making potent use of the most recent frameworks and lines on supply within the Java EE 7 unlock.
• exhibits off the most up-tp-date Java firm version applied sciences.
• offers recommendations to making subtle person interfaces.
• Demonstrates confirmed recommendations for powerful database entry.
<h3>Table of Contents</h3><ol> • advent to Servlets
• JavaServer Pages
• the fundamentals of JavaServer Faces
• JavaServer Faces typical elements
• complex JavaServer Faces and Ajax
• Object-Relational Mapping
• company JavaBeans
• The question API and JPQL
• Oracle's Glashfish
• Contexts and Dependency Injection
• Java Message provider
• Authentication and defense
• Java net providers
• firm recommendations utilizing substitute Programming Languages
• WebSockets and JSON-P
• JavaFX within the company
• Concurrency and Batch purposes
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Additional info for Java EE 7 Recipes: A Problem-Solution Approach
Xml deployment descriptor for the SimpleServlet application. They include the initialization parameter names and values. . . How It Works Oftentimes there is a requirement to set initialization parameters for a servlet in order to initialize certain values. Servlets can accept any number of initialization parameters, and there are a couple of ways in which they can be set. xml deployment descriptor, as demonstrated in Solution #2. 0 API. Therefore, Solution #1 is the more contemporary approach, but Solution #2 remains valid for following an older model or using an older Java servlet release.
For more information on registering a servlet via the @WebServlet annotation, see Recipe 1-4. The @WebInitParam annotation accepts a name-value pair as an initialization parameter. In the solution to this recipe, the parameter name is name, and the value is Duke. @WebInitParam(name="name", value="Duke") Once set, the parameter can be used within code by calling getServletConfig(). println("
This is a simple servlet to demonstrate context! getInitParameter("name") + "
"); The annotations have the benefit of providing ease of development, and they also make it easier to maintain servlets as a single package rather than jumping back and forth between the servlet and the deployment descriptor.
Second, in the case that there are potentially long-running methods, code them so that you will become aware of a shutdown and, if necessary, halt and return so that the servlet can shut down cleanly. The following code excerpt is a small example of a destroy method. In this code, it is being used to initialize local variables and is setting the beingDestroyed boolean value to indicate that the servlet is shutting down. . . The code within the destroy method may successfully achieve a full cleanup of the servlet, but in the case where there may be a long-running task, then it must be notified of a shutdown.