What is the difference between servlet and ejb

To deploy this application, you will need an EAR file that contains the following:. Create a standard web. Next, create the standard J2EE directory structure for Web application deployment, then move the web. Once you create and populate the directory structure, create a WAR file named myapp-web. Here are the WAR file contents:.

Create a standard ejb-jar. In this example, they use the same name, which is a good practice but is not required. These must be the same entries as in the web. Create a JAR file named myapp-ejb. Here are the JAR file contents:. To deploy the application, create a standard application deployment descriptor, application. This file describes the modules in the application. Finally, create an EAR file named myapp. Here are the EAR file contents:.

To deploy the application, the following entry is added to the server. If you use the admin. See "Using admin. The next step is to bind the Web module to a Web site. You will need the following entry in the Web site XML file typically http-web-site.

According to the configuration of this example, you can invoke the servlet as follows, assuming a host myhost. By default, OC4J standalone uses port Figure , which follows, shows the application output to a Web browser.

The output from the servlet is printed in H1 format at the top, then the output from the EJB is printed in text format below that. The discussion highlights use of the orion-application. In OC4J, to perform a remote EJB lookup within the same application but on different tiers where the same application has been deployed to both tiers , you must set the EJB remote flag appropriately on each tier.

When this flag is set to " true ", beans will be looked up on a remote server instead of the EJB service being used on the local server. Here is an example of setting it to " true ":. The suggested steps are illustrated in Figure and described below. Given this setting, the servlet will not look for EJBs on server 1. Given this setting, the servlet will look for EJBs on server 2.

Note: In the rmi. This avoids possible JAZN configuration issues. If the check-for-updates flag is enabled By using the admin. Note: Remember that this discussion assumes an OC4J standalone environment during development.

Ejb is a EJBCntainer. Ejb is business logic. Post New Answer. Is This Answer Correct? Why is ftp stateful? Apache and IIS are two popular web servers. NET world. Coming back to web containers or servlet engines, Apache Tomcat and Jetty are two of the most popular Servlet engine in the Java web world. Features and Responsibility The significant difference between the web server and application server comes from a responsibility perspective.

Web servers are responsible for serving static content e. This is also one of the popular questions on Java JEE interviews, but for better preparation, you can also refer Java Programming Interview Exposed book, one of the best to prepare for Java web development interviews.

Service One more difference between an application server and a web server comes from the service perspective. It's expected from a Web server to provide HTTP protocol level service while the application server is supposed to provide more powerful and dynamic Web service and business level service via EJB Enterprise Java Beans.

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