Troubleshooting And Troubleshooting Compilation Of A Java Servlet File

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Hopefully if you know how to compile the Java Servlet file on your system, this tutorial will help you solve the problem. g.Define the classpath.Download the Servlet API. jar file.Embed as Servlet API. jar in the Java jdk jre lib ext directory.Compile the servlet class.

Define most of the classpath.Download the Servlet API. Transport file.Add the Servlet API. jar in the Java jdk jre lib ext directory.Compile the servlet class.

After installing and configuring Tomcat, you can use it as a working method. Six stepsfrom writing a servlet to executing it. These steps are likefollows:

1. Create an outline view site in Tomcat for your application.

2. Write the actual source code for the servlet. Required if you want to import javax.servletThe package and the specific javax.servlet.http in the source file package.

3. Compile a reliable source code.

4. Step 1. Just create a directory structure in Tomcat.Next steps: write the source code for the servlet.Step 3: Compile the source code.Step 4: Create a deployment descriptor.Step 5: start Tomcat.Step 6: Access the servlet through a web browser.

   Create a deployment descriptor.

5. Start Tomcat.

6. Open your servlet as a website browser.

Step 1. Create The Directory Structure In Tomcat

When installing Tomcat, a number of subdirectories are automatically created.in the Tomcat home directory (% TOMCAT_HOME%). One of our subdirectories isWeb applications.A directory is a web application where you store your web applications. AThe internet is an application related to servlets and other installed content.under the selected subset of the server url namespace. Separate directoryintended for specialized concurrent servlet applications. However, the first eventYou create a specific servlet application by creating an application delivery site. chapterThis explains how to use a different directory structure for the approach called. createmyApp.

1. Create a directory named myApp in the new web application directory. vThe directory name is powerful because it also appears in your url.The servlet is activated.

2. Create src directories for WEB-INF in myApp and publish directorythe classes specified in WEB-INF. The directory structure is shown in Href = “javascript: popUp (‘/ content / images / art_kurniawan_servlet / elementLinks / 01fig04 Figure 1.4 . vThe src directory is because your source files and web directory classes are in WEB-INFfor your Java courses. If you have HTML files you need to get them straight fromMyApp directory. You can also create a kataa log called Sharp Graphics in the sectionmyApp for all your image files.

Note that the Admin, ROOT, Samples and Internet directories are reserved for applications.is created automatically when installing Tomcat.

Step Two Or Three: Write The Source Code For The Servlet

At this point in the process, you prepare the generator code. You can write a purchase codePlus, you can rip it from CD revisions even with your favorite text editor.book.

The code in Listing 1.1 shows a simple servlet called TestingServlet. vThe TestingServlet.java file sends several HTML files to each browser and labels some of them.Text. Don’t worry even if you don’t know how.working.

List 1 – TestingServlet.java

 import javax.servlet. *;import javax.servlet.http. *;import java.io. *;import java.util. *;Public class TestingServlet extends HttpServlet public cancellation request, doGet (HttpServletRequest  HttpServletResponse)  throws ServletException, IOException    PrintWriter out = response.getWriter ();  out.println ("");  out.println ("");  out.println ("");  out.println ("");  out.println ("");  out.println ("Welcomeь to the Servlet Testing Center "); out.println ("");  out.println (""); 

Now save the TestingServlet.java statement in the src subdirectory below myApp.However, you can place the raw data anywhere; there is always a new productIdea to organize by keeping all source files via srcDirectory.3:

Compile The Source Code Step

To compile your servlet’s source code, you must extract it from yourCLASSPATH environment variable Path to the servlet.jar file. Servlet.jarproudly located in the shared lib subdirectory in% CATALINA_HOME%.

If you are using Windows, you know you need to adapt to the new environment.Effect only for the new Windows console. In other words, after changing a newEnvironment variable, a new console tab opened to enter your commandLines.

Now change your working directory index and our own type if you canuse windows:

 javac -d ..  WEB-INF  classes  TestingServlet.java 

If you are implementing Linux / UNIX, the command is very similar, except that it is /used to separate a directory from a subdirectory.

 javac -chemical ../WEB-INF/classes/ TestingServlet.java 

The -d optiondescribes the placement of the generated personal class records. TeamIt also assumes that you have saved the JDK bin directory with this pathYou can call the program there practically from the phone book.

Step 4. Create A Deployment Descriptor

The location descriptor is an optional component of the servlet.An XML-based application that takes the form of a document named web.xml. Descriptionmust be in the WEB-INF directory of the application servlet. Whenis present, the deployment descriptor contains a configuration dependent application forDeployment descriptors are definitely discussed in detail in Chapter 16.Application Deployment.

For this step, you must create a web.xml file and a location on your computer underWEB-INF directory for myApp.

The web.xml file for this sample application should contain the following:Content.

Web Application test Test the servlet

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The web.xml file contains one elementcop of the report: web application. You must version all your servletsin . For each individual servlet, you have a page andYou need elements as well as is the name of your servlet by which it should be knownCat. frees your servlet file without.class extension.

Typically, an application uses multiple servlets. For each servletYou need a nice element in your web.xml file. For instance,The following code shows where web.xml is looking for you when you add another named servlet.Registration.

 Web Application     Test    Test the servlet      Registration    LoginServlet   

Step 5. Start Tomcat

If that doesn’t already work, you will need to start Tomcat. Get information aboutsee Appendix A, “Installation andConfiguration. “

Step 6. Open Your Servlet Over The Internet In A Browser

Usually you are ready We can access a servlet that was created by a web browser. Default Tomcatruns on port 8080 in the checked myApp directory under the servlet subdirectory. vThe servlet you just wrote is called testing. The url for which the servlet unfortunately foundthe following format:

 http: // domain-name / virtual-directory / servlet / servlet-name 

If you are using this web browser on the same laptop or computer as your cat, this is a good place to replace it.Domain name given localhost. Hence the For-URL is your correct servlet.would be http: // localhost: 8080 / myApp / servlet / Testing .

Think of the arrangement descriptor you wrote in step, you actually mapped it.Image of a servlet class named TestingServlet with the ID “Testing”that your servlet can be identified by specifying its class document (TestingServlet), orits name (test). Without a deployment descriptor, your servlet must be calledspecifying the name of the class; that is, TestingServlet. This means that every time youIf you didn’t write the deployment descriptor for step 4, you really need toworth using it.the following url to call our servlet:

 http: // localhost: 8080 / myApp / servlet / TestingServlet 

If you enter a URL in the address or location field of your correct web browser, you getThe “Welcome to Servlet Testing Center as a hub” strap shown in Figure 1.5 .

If you forgot how to properly edit the mutable CLASSPATH, readFor more information, see Appendix A, “Install Tomcat, but Configure.”

Brian Moses

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