EAR (Enterprise Application aRchive) is a file format used by Java EE for packaging one or Each module element contains an ejb, web or java element which describes the individual modules within the application. Web modules also . Shutting down the EJB container will not cause it to persist your data. public Integer ejbCreate(Integer id, String name, String fileType, String. Vendors. JDBC, JSP, Servlets, and EJB all require components that are built by third-party vendors. MIME file type and an extension. °. —File.
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There are many articles and tutorials out there that discuss how to use the individual technologies in Java EE 6, e. This article aims to provide detailed steps to develop a web-based application based on technologies in the JEE6 specs, i. The objective of this tutorial is to demonstrate the ease of using the various JEE6 technologies and putting them together to create an enterprise-ready web-based application.
Although the application is developed for demo purposes, its architecture represents the best practices in developing an enterprise application, whereby modularity, scalability, and reusability are taken into consideration. The architecture of the application is shown in the above diagram, where it is organized into various tiers: Presentation, Business, Data Access and Data, where each has an important role to play and is segregated from one another.
This architecture encourages a clean separation of responsibilities, reusability, and scalability through the use of Enterprise Java Beans.
With the use of JSF and JPA, GUI development becomes a breeze and developers are no longer bogged down by the tedious and error-prone chores of converting relational data to OO, which is natural in Java and vice versa. So, all-in-all, this demo not only demonstrates the use of the various JEE6 technologies, it also demonstrates the best-of-breed application architecture that can be used in filetyep production system.
This tutorial assumes that you have some basic knowledge of, or programming experience with, the following technologies. Before you begin, you need to download and install the filrtype software on your computer:.
EAR (file format) – Wikipedia
The approach for developing the demo fiketype, CustomerAppwill be from the back end, i. Before anything else, we first need to create the Entity Classes and because in this demo, the Session Beans are responsible for manipulating the data, they will be created in the EJB project.
Now that we have the Entity classes, the next task is to create the Session Stateless Bean, CustomerSession that will manipulate and provide the RU functionalities on the Customer objects.
In this demo, the client that uses these functions are the JSF pages. One of the benefits of doing this i. Other benefits include scalability because the EJB container can easily be tuned and scaled up when load increases.
In this tutorial, we want to send out notifications upon a rjb update of a Customer record. For simplicity, we are just sending the updated Customer object to the Queue, so flletype the MDB can pick it up and process it in a separate thread. Up to this point, the tasks required to be done in the EJB project are completed, we will move on to the next tier, Presentation, i.
I have found PrimeFaces to be the most complete and suitable for this demo as it has implemented the dataTable UI component and it seems to be the easiest to integrate into the NetBeans IDE. Before we are able to use PrimeFaces components in our facelets, we need to include its library in NetBeans IDE and set up a few things. At this point, we are done setting filtype and configuring the environment for PrimeFaces to work in NetBeans. We will next create the Customer Listing and Details views.
To achieve this, we will be creating 2 web pages:. Before creating the JSF pages, we first create the managed bean which will be providing the required services for the JSF pages that will be created later. Now, we are ready to create the first web page that lists the Customer records in the database in a tabular form. Now we will create the page where the details of the selected customer is displayed and can be updated. At this point you should have a fully working application with filwtype RU functionalities.
Using the same approach and methods, you can expand the application into a full-fledged enterprise application with little effort. If you cannot get your application to work like how it is supposed to be, not to worry, you can get a copy of the working solution from here.
Although the same application can be achieved easily by using JSF and JPA alone, but it may not be as scalable and reusable as what is being done here. In this tutorial, the application is segregated into different tiers where each does what they do best: This promotes the principle of separation of concerns and each tier can change without effecting the other, e.
Download the free trial. Over a million developers have joined DZone. Join the DZone community and get the full member experience. Contents The rest of this article consists of the following sections: Prerequisites This tutorial assumes that you have some basic knowledge of, or programming experience with, the following technologies.
A copy of the working filteype is included here if needed. Creating the Enterprise Application Project The approach for developing the demo app, CustomerAppwill be from the back end, i. Select the project location and name the project, CustomerAppand click Next. Creating the Entity Classes from the Database Before anything else, we first need to create the Entity Classes and because in this demo, the Session Beans are responsible for manipulating the data, they will be created in the EJB project.
Provide a package name, e.
Change the Collection Type to ” java. List ” and click Finish. Take note of the new classes created under the Source Packages in the Projects window: Click Finish to complete the creation of the MDB. From the Projects window, navigate to the source of the newly created Session Bean skeleton by double clicking on the CustomerSessionBean item: Create the business methods for the Session Bean: Retrieve and Update ; right-click in the code editor, select Insert Code In the Add Business Method Repeat the steps for the Update function and notice the skeletons created for the 2 methods.
Edit the methods so that they implement the intended functions as shown below: In the code editor, right-click and select “Insert Code Note that typically you would not want to process the message in the MDB itself: But, for purposes of demonstration in this tutorial, we are stopping at the MDB: In the Projects window, right-click on the Web project, CustomerApp-warand select Properties last item.
Download the PrimeFaces library primefaces In the Library Manager dialog, choose “New Library” and provide a name for the library, e.
The NetBeans E-commerce Tutorial – Adding Entity Classes and Session Beans
Next, we need to add the newly created library, PrimeFaces2 to the Web project: Select the Web project, CustomerApp-warfrom the Project window, right-click and select “Properties”. Under the Libraries category, click on the “Add Library Edit the content of the file so that it looks like this: To achieve this, we will be creating 2 web pages: Notice the automatically generated variable, customerSessionBean that represents an instance of the session bean, at the beginning of the class declaration.
Add the rest of the methods properties and action handlers and its implementations in the class as shown below, they will be used by the JSF pages later: For convenience sake, we are going to create the initial table from the palette instead of coding from scratch. Customer” as the Entity Bean, and “customer. The result of this are lines of codes automatically generated to display a default list of the Customer objects. At this point, we are ready to see the result of the first web page created so far.
To confirm that the deployment is successful, navigate to the Applications folder in the Glassfish server under the Services window and check if the application, CustomerAppexists: Open the browser and go to URL, http: The screen is very raw and without any beautification because up to now, it is still plain vanilla JSF.
So we will next modify the page to show only the columns of interest and to use PrimeFaces dataTable where pagination is made possible. Now that we have the listing page, let’s move on to create the details page. Creating the Customer Details Web Page Now we will create the page where the details of the selected customer is displayed and can be updated. The result of this are lines of code automatically generated to display the label and input field of all the attributes in the Customer object in a 2 column grid.
To enable the navigation from the Listing page to the Details and vice versa, you need to edit the faces-config.
To see the result, save and deploy the application, go to the Customer listing page at URL, http: Again, this looks very raw, so let’s try to spice it up a little and include the Update function as well. The Discount Codes is a fixed list in the database, so it makes sense to present it in the form of a dropdown list for user to select for Update.
So we will bind the value of the of the Discount Codes dropdown list to a new property, customer. So we will need to create the getter and setter methods for a new property, discount in the Customer Entity class, which uses Character as the argument: Add the Command buttons, for Update and Back. Rearrange the rows and use a different background color for the panelGrid. Good luck with your next Java EE application! See Also For other related resources, see the followings: Opinions expressed by DZone contributors are their own.
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