By James Goodwill

Apache Jakarta-Tomcat, the legit reference implementation for the Java servlet and JavaServer Pages applied sciences, has lengthy been heralded as an exceptional platform for the improvement and deployment of robust net functions. The lately published model 4.0 deals not just a number of improvements in flexibility and balance, but additionally an array of latest good points which are absolute to extend upon the Tomcat builders' already filthy rich toolset.

In this namesake identify, best-selling writer James Goodwill presents readers with a radical advent to Jakarta-Tomcat, delivering guideline on subject matters starting from the fundamental install and configuration strategy and net software deployment to complicated ideas of integration with different renowned Apache origin tasks equivalent to the Apache net server, Struts, Log4J, and the Apache XML cleaning soap venture.

In addition to an already entire advent to middle Tomcat performance, readers additionally take advantage of a precious primer of what's provided in model 4.0, as Goodwill takes care to completely talk about new positive aspects resembling valves, protection geographical regions, power periods, and the Tomcat supervisor program. In precis, Apache Jakarta-Tomcat deals either beginner and complicated Jakarta-Tomcat clients a realistic and complete consultant to this robust software.

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Extra resources for Apache Jakarta-Tomcat

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PageContext The pageContext object provides access to the namespaces associated with a JSP. It also provides accessors to several other JSP implicit objects. HttpSession object, which is used to store objects in between client requests providing an almost state-full HTTP interactivity. An example of using the session object is shown in Listing 3-6. jsp If everything went well, you should see a page similar to Figure 3-8. jsp Click on your reload button a few times to see the count increment. ServletContext, and it is most often used to access objects that are stored in the ServletContext to be shared between Web components.

Listing 3-4 provides an example using the implicit out object. jsp" %> 51 Use Out <% // Print a simple message using the implicit out object. jsp You should see a page similar to that shown in Figure 3-6. jsp request The first of the implicit objects is the request object. HttpServletRequest interface, which we discussed earlier. The request object is associated with every HTTP request. 52 One of the more common uses for the request object is to access request parameters.

You simply need to create a basic JSP and then tell the JSP engine that the page is an error page. This is accomplished by setting the JSP's page directive attribute, isErrorPage, to true. Listing 3-2 contains the source code for a sample error page. getMessage() %> has been reported. The first JSP-related line in this page tells the JSP compiler that this JSP is an error page. This code snippet is: <%@ page isErrorPage="true" %> The second JSP-related section uses the implicit exception object that is part of all JSP error pages to output the error message contained in the unhandled exception that was thrown in the offending JSP.

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