{"id":12519,"date":"2013-05-08T19:19:35","date_gmt":"2013-05-08T16:19:35","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=12519"},"modified":"2019-12-09T21:39:40","modified_gmt":"2019-12-09T19:39:40","slug":"java-ee-cdi-disposer-methods-example","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2013\/05\/java-ee-cdi-disposer-methods-example.html","title":{"rendered":"Java EE CDI Disposer methods example"},"content":{"rendered":"

This is a tutorial of CDI Disposer<\/code> methods. In CDI, since a Producer<\/code> method generates an object that can then be injected in an application, the Disposer<\/code> method is used so that the object is removed when its work is completed. A Disposer<\/code> method is always matched to a Producer<\/code> method.<\/p>\n

An example of the Disposer<\/code> method use is when an application uses a connection to a database. Since the connection must close after the interface with the database is completed, the Disposer<\/code> method is used to remove the object that represents the connection.<\/p>\n

Here we shall show you how to make use of a Disposer<\/code> method. We will create a simple service. Then we will create a Producer<\/code> method to produce and inject the service in an application and a Disposer<\/code> method to clean up the service, once it is ended.<\/p>\n

Our preferred development environment is Eclipse<\/a>. We are using Eclipse Juno (4.2) version, along with Maven<\/a> Integration plugin version 3.1.0. You can download Eclipse from here<\/a> and Maven Plugin for Eclipse from here<\/a>. The installation of Maven plugin for Eclipse is out of the scope of this tutorial and will not be discussed. Tomcat 7<\/a> is the application server used.<\/p>\n

Let’s begin,<\/p>\n

1. Create a new Maven project<\/h2>\n

Go to File -> Project ->Maven -> Maven Project.<\/p>\n

\"New-Maven-Project\"<\/a><\/p>\n

In the “Select project name and location” page of the wizard, make sure that “Create a simple project (skip archetype selection)” option is unchecked<\/strong>, hit “Next” to continue with default values.<\/p>\n

\"new<\/a><\/p>\n

Here the maven archetype for creating a web application must be added. Click on “Add Archetype”<\/strong> and add the archetype. Set the “Archetype Group Id” variable to \"org.apache.maven.archetypes\"<\/code>, the “Archetype artifact Id” variable to \"maven-archetype-webapp\"<\/code> and the “Archetype Version” to \"1.0\"<\/code>. Click on “OK”<\/strong> to continue.<\/p>\n

\"maven-archetype-webapp\"<\/a><\/p>\n

In the “Enter an artifact id” page of the wizard, you can define the name and main package of your project. Set the “Group Id” variable to \"com.javacodegeeks.snippets.enterprise\"<\/code> and the “Artifact Id” variable to \"cdibeans\"<\/code>. The aforementioned selections compose the main project package as \"com.javacodegeeks.snippets.enterprise.cdibeans\"<\/code> and the project name as \"cdibeans\"<\/code>. Set the “Package” variable to \"war\"<\/code>, so that a war file will be created to be deployed to tomcat server. Hit “Finish” to exit the wizard and to create your project.

<\/div> <\/div><\/p>\n

\"newcdiproject1\"<\/a><\/p>\n

The Maven project structure is shown below:<\/p>\n

\"newcdiproject2\"<\/a><\/p>\n