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Tag Archives: java 7

Java Servlet Hidden Field Example

A hidden form field is a technique used to store the session information for a particular client and is one of an important Session Tracking Technique. In this tutorial, we will explain and show you how to handle the hidden fields in a Servlet. 1. Introduction Session Tracking is a technique to maintain the requests of the same user for a ...

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Java Servlet onclick Example

Servlets are modules of the Java code that run in a server application to answer the client requests. They are not tied to a specific client-server protocol but are most commonly used with HTTP. The word “Servlet” is often used in the meaning of “HTTP Servlet“. In this tutorial, we will explain and show you how to call a Servlet ...

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Java Servlet Sync Context Example

Async Servlet was introduced in Servlet 3.0. It is a great way to deal with the thread starvation problem with the long-running threads. In this tutorial, we will understand what Async Servlet is.                     1. Introduction Let’s say we have a Servlet that takes a lot of time to process, something ...

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Java Servlet AsyncListener Example

Async Servlet was introduced in Servlet 3.0. In this section, you will learn about registering AsyncListener with the recently created AsyncContext with an example. The AsyncListener will be notified when an asynchronous event occurs. 1. Introduction AsyncEvent contains the details of the event occurred by the Asynchronous processes. These events include the successful completion of the asynchronous cycle, times out, ...

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Java Servlet SendRedirect Example

Communication between the Servlets is an important task to the programmer. sendRedirect() can be used to communicate between two servlets present in the different servers. The output will be the same as the Request Dispatcher Forward example but the URL of the page will be changed to the redirected page. In this tutorial, we will see how the sendRedirect() method ...

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Java Servlet Annotations Example

Communication between the Servlets is an important task to the programmer. In this tutorial, we will see how the Servlet annotations can replace the equivalent XML configuration in the web deployment descriptor file (web.xml). 1. Introduction The Servlet API 3.0 introduces a new package called javax.servlet.annotation which provides the annotation types which can be used for annotating a Servlet class. ...

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Java Servlet Life Cycle Example

Servlets are modules of the Java code that run on a server application to answer the client requests. They are not tied to a specific client-server protocol but are most commonly used with HTTP and the word “Servlet” is often used in the meaning of “HTTP Servlet“. In this tutorial, we will explain the Servlet Lifecycle. 1. Introduction Servlet is ...

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Java Servlet Filter Example

Servlets are modules of the Java code that run in a server application to answer the client requests. In this tutorial, we will explain how to implement the Servlet Filter API to handle the client requests. 1. Introduction Servlet is a Java program which exists and executes in the J2EE servers and is used to receive the HTTP protocol request, ...

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Log4j Enable/Disable Logging Example

Let’s say developers want to disable or enable the Log4j framework by simply clicking some checkboxes. The advantage of this is that when developers use the Log4j framework in the production environment and want to enable logging at any time, they just don’t need to change the XML or the properties file from the local machine and then upload it. ...

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Log4j 2 Getting Started Example

In this tutorial, we will show you how to configure the Log4j2 with log4j2.xml file and print the logging to the console and a file. 1. Introduction Printing messages to the console is an integral part of the development testing and the debugging of a Java program. If developers are working on a Server side application, where they cannot see ...

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