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Additional resources for Murach's Java Servlets and JSP, 2nd Edition

Sample text

This can be referred to as the Tomcat home directory. To make it easier to refer to this directory later on, we recommend that you change its name to tomcat as specified by step 7 in this figure. The last step in this procedure is to copy (not move) the JAR files shown in this figure from Tomcat's lib directory to the JDK's jre\lib\ext directory. In case you need to refresh your memory, a Java Archive (JAR) file contains a group of Java classes in a compressed format. The JAR files shown in this figure allow the Java Runtime Environment (JRE) to work with servlets, JSPs, the Expres­ sion Language (EL), and database connection pooling (DBCP).

Then, the servlet engine runs that servlet. • A servlet is a Java class that runs on a server. For web applications, a servlet extends the HttpServlet class. To pass HTML back to the browser, a servlet can use the println method of the out object. • When you develop a Java web application, you can use servlets to do the process­ ing that's required and JSPs to present the user interface. • You can develop servlets and JSPs on your own computer, on a Local Area Network (IAN) that functions as an intranet, and on the Internet.

Two common Tomcat problems and how to solve them The first error page in figure 2-6 indicates that there's a problem connecting the browser to Tomcat. H you're using a different version of Internet Explorer, you'll see a similar error page. And if you're using the Firefox browser, you'll get a message that says that the browser can't connect to the server. No matter how the message looks, there are two probable causes for this problem. First, the server might not be running, which you can fix by starting Tomcat.

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