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HttpSessionAttributeListener is a listener interface from Servlet API. Implementation of this listener will be notified when an attribute is added, removed and replaced in session scope. Using this we can track all the attributes of session scope. The listener have three methods as shown in below source code. attributeAdded(.) : It is invoked when an […]

Annotation based programming model simplifies and reduces configuration in project. Annotation is nothing but a meta-data. Generally we define meta-data in xml file. The same meta-data can be declared through Java Annotation (no xml required). Servlet3.0 and later version support Servlet development through Annotation, and avoid the configuration in web.xml file. Below code demonstrates the […]

  JMS is a Message Oriented Middleware(MOM) solution for Java Platform. JMS provides asynchronous and synchronous distributed computing environment for Java software components. Using messaging technology two software components running in different system can communicates with each other through message. For example we have a banking application containing 2 components – Transaction Component and SMS […]

Here we learn how to upload a file in JSP/Servlet web application with the help of Apache Commons Library. This program is using 2 jar files : commons-fileupload.jar commons-io.jar Add both jar files in project classpath (or library) The below image is showing project directory structure and required files: index.jsp : Form to select file […]

Apache TomEE: Apache TomEE (= Tomcat + Java EE), is a light weight container designed for Web Profile. The server is an extension of Tomcat with support of Java EE components (like EJB, Message Queue, JPA, JSF etc). Normal Tomcat is just used as Web Container(Servlet/JSP support). Apache TomEE is a Oracle certified project, contains […]