Beginning JSP, JSF and Tomcat, 2nd Edition: Java Web by Giulio Zambon

By Giulio Zambon

Begin construction Java - dependent net purposes now, no matter if you are a whole newcomer to Java. complete and instance - pushed, starting JSP, JSF, and Tomcat: Java net improvement, moment variation is all you want to advance dynamic Java-based internet functions utilizing JSP, hook up with databases with JSF, and positioned them into motion utilizing the world's most well-liked open resource Java internet server, Apache Tomcat.

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Additional resources for Beginning JSP, JSF and Tomcat, 2nd Edition: Java Web Development

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It then executes the same servlet object within each thread. If the application runs on a distributed environment or for high numbers of requests, Tomcat can instantiate the same servlet more than once. Therefore, only the third declaration guarantees that the variable will be shared among all requests. Tomcat keeps the servlet code buried deep in the folder named work. java. You’re free to name your variables as you like, though your case-sensitive string of characters must begin with a letter, a dollar, or an underscore, and not contain a space.

Figure 1-11. info CHAPTER 1 INTRODUCING JSP AND TOMCAT Listing the HTML-Request Parameters With JSP you can generate dynamic web pages. That’s settled. But the utility of dynamic pages goes well beyond recognizing what browser the viewer is using or displaying different information on different days. What really matters is to be able to adapt the content of a web page on the basis of who the viewer is and what the viewer wants. Each HTML request includes a series of parameters, which are usually the results of what the viewer enters into a form before hitting the “Submit” button.

Then, everything will become clearer. ServletConfig. Tomcat uses this object to pass information to the servlets. xml file. You will learn more about this file later on. The default for is jsp. NullPointerException) and is only available in error pages. Listing 2-7 shows you two methods to send the stack trace to the output. StackTraceElement, which you can then analyze with methods such as getClassName, getFileName, getLineNumber, and getMethodName. Listing 2-7. printStackTrace(new PrintWriter(out)); %>

Notice the directive <%@page isErrorPage="true"%>, without which the implicit object exception is not defined.

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