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In 1 s simple hello.jsp example (shown in Listing 1-3), you saw that request.getHeader("user-agent") returns a string that describes the client s web browser. Despite the fact that the variable request isn t defined anywhere, this works because Tomcat defines several implicit variables: application, config, out, pageContext, request, response, and session. The most commonly used are out and request, followed by application and session. This first line of hello.jsp is an example of a directive element, another component of JSP: <%@page language="java" contentType="text/html"%> Directives provide Tomcat with information it needs to translate the JSP page. As such, directives are independent of specific requests. Besides page, other available directives are include and taglib. In 1, we didn t show you any example of a standard action, another component of JSP. The purpose of standard actions is to encapsulate activities that Tomcat performs when handling an HTTP request from a client. There are more than a dozen standard actions: attribute, body, element, fallback, forward, getProperty, include, param, params, plugin, setProperty, text, and useBean. For example, the following standard action includes in a JSP page the output of another JSP: <jsp:include page="another.jsp"/> The hello.jsp example also includes another JSP component, a scripting element, which is a scriptlet delimited by the pair <% and %>. All scripting elements consist of code delimited by particular sequences of characters. EL is a JSP component that gives you easy access to external objects (i.e. Java beans).

} } } public void afterPhase(PhaseEvent event) { } }

As a foundation for the discussion that will follow, we will briefly review here the logging mechanisms and log files available on a typical server running some flavor of Unix. Paths mentioned here are common Unix defaults. The system log, which is considered the main communication channel for the kernel and many services, is located at /var/log/messages. Check this log regularly for information about hardware and overall system health. Three server logs are particularly relevant for PHP developers: HTTPD server activity is logged at /var/log/httpd/apache-access_log. The mail server activity is logged at /var/log/maillog. The MySQL server activity is logged in mysql.err in the MySQL data directory, typically /var/db/mysql.

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JSP provides a mechanism that lets you define custom actions in which a prefix of your choice replaces the jsp of the standard actions. With the tag extension mechanism, you can create libraries of actions, which you can then use in all your applications. Several custom actions have become so widely used in the programming community that Sun Microsystems decided to standardize them. The result is JSTL.

User-level activity for system-level interactions like logins and logouts is logged at /var/log/secure. Process activity, including which commands are executed and how much CPU time those commands take, is logged by the system for each user account, but only if process accounting is turned on (see http://www.tldp.org/HOWTO/ProcessAccounting/ for more information). The sa command is used to print and summarize this information.

... @Named("loginRequest") @RequestScoped public class LoginRequest { private String username; private String password; @Current private UserHolder userHolder; ... public String login() { if (username.equals("u1") && password.equals("p1")) { userHolder.setCurrentUser(new User("u1", "p1", "1234")); String viewId = userHolder.getOriginalViewId(); if (viewId != null) { FacesContext context = FacesContext.getCurrentInstance(); Application app = context.getApplication(); ViewHandler viewHandler = app.getViewHandler(); UIViewRoot root = viewHandler.createView(context, viewId); context.setViewRoot(root); userHolder.setOriginalViewId(null); return null; } else { return "loggedIn"; } } else { FacesContext context = FacesContext.getCurrentInstance(); context.addMessage(null, new FacesMessage( FacesMessage.SEVERITY_ERROR, "Login failed", null)); return null; } } }

A JSP page consists of a page template, which is composed of HTML code, as well as JSP elements, such as directives, scripting elements, and standard actions. As we mentioned in 1, scriptlets, which are a type of scripting element, let you embed Java code in an HTML page.1 Every Java executable whether it s a free-standing program running directly within a runtime environment, an applet executing inside a browser, or a servlet executing in a container such as Tomcat boils down to instantiating classes into objects and executing their methods. This might not be so apparent with JSP, because Tomcat wraps every JSP page into a class of type Servlet behind the scenes, but it still applies. Java methods consist of a sequence of operations to instantiate objects, allocate memory for variables, calculate expressions, perform assignments, or execute other methods. In this section, we ll summarize the syntax of Java while keeping JSP in mind. This practical introduction will provide the essentials and point out some pitfalls.

In many Unix distributions, a daily log file summary and the output of security scripts are emailed to sysadmins or their representatives. Make sure that there is an email alias for root that points to

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