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To run this tutorial, as a minimum you will be required to have installed the following prerequisite software.:
- Sun JDK
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- 6.0+ (J2SE 1.
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- 6)
- Eclipse
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- IDE for Java EE Developers, which is platform specific
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- Apache Geronimo Eclipse Plugin 2.1.x
- Apache Geronimo Server 2.1.x
Note Geronimo version 2.1.x, Java 1.5 runtime, and Eclipse Ganymede are used is used in this tutorial but other versions can be used instead (e.g., Geronimo version 2.2, Java 1.6, Eclipse Europa)
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Details on installing eclipse are provided in the Development environment section. This tutorial is organized in the following sections:
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- Launch Eclipse and Create a dynamic web project as shown in the figure
- Give the fields for the Web Project as shown in the following figure
- Check the box for JavaServerFaces and under the version tab select 1.2 as the version
- Once done you can give default values for web module and Geronimo Deployment Plan. On the JSF capabilities window check the box and select new as shown in the figure
- The next window suggests to create JSF Implementation library. Give the library name as JSFCustomLibrary and add the following jars. Select Finish once done. See the figure below:
- <GERONIMO_HOME>\repository\commons-beanutils\commons-beanutils\1.6.1\commons-beanutils-1.6.1.jar
- <GERONIMO_HOME>\repository\commons-collections\commons-collections\3.1\commons-collections-3.1.jar
- <GERONIMO_HOME>\repository\commons-digester\commons-digester\1.8\commons-digester-1.8.jar
- <GERONIMO_HOME>\repository\commons-logging\commons-logging\1.0.4\commons-logging-1.0.4.jar
- <GERONIMO_HOME>\repository\org\apache\myfaces\core\myfaces-api\1.2.2\myfaces-api-1.2.2.jar
- <GERONIMO_HOME>\repository\org\apache\myfaces\core\myfaces-impl\1.2.2\myfaces-impl-1.2.2.jar
- Check Deploy and modify the URL pattern to *.jsf as shown in the figure. Select Finish.
This finishes the setting up of Eclipse IDE for application development
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- Under the project explorer right-click on the SimpleJSF project and create a new class
- Fill the New Java Class form with jsf as the package name and FirstName as the bean class name. Select Finish once done
- Add the following code to the FirstName bean class
Code Block JAVA JAVA borderStyle solid title FirstName.java package jsf; public class FirstName { String username; public String getName() { return username; } public void setName(String name) { username = name; } }
- Create a second Bean class LastName and add the following code to the class
This completes the Model definition and implementation of bean class.Code Block JAVA JAVA borderStyle solid title LastName.java package jsf; public class LastName { String lastname; public String getLName() { return lastname; } public void setLName(String lname) { lastname = lname; } }
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- In an JSF application controller is implemented by a configuration file WebContent/WEB-INF/faces-config.xml. Double Click -click on the file. This will open a Faces Configuration Editor.
- Select the ManagedBean tab in the editor. Choose Managed Bean of scope request and select Add.
- Using the existing java class option, select Browse. Give the search element as FirstName and select ok.
- Select Finish on the next window. Similarly add the other bean LastName. Now select the Source tab in the Faces configuration Editor. It displays the bean components(Model) in the controller.
This completes the description of Model to Controller.
Define and implement View(V) in application
- Right Click -click on WebContent and create a New Folder with the name pages
- Right Click -click on pages folder and create a jsp page JSP called login.jsp. Select Finish.
- Similarly create another jsp JSP page called welcome.jsp.
- Moving forward now we now have to include Tag Library Descriptors(TLD) in our application.
Geronimo comes packaged with the TLD's required for application. The TLD's can be found in
#To add these two TLD's in the application, In Eclipse Under project Explorer right-click on WEB-INF. Create a folder called tld. Copy myfaces-html.tld and myfaces_core.tld to this folder.No Format borderStyle solid title Location of TLD <GERONIMO_HOME>\repository\org\apache\myfaces\core\myfaces-impl\1.2.2\myfaces-impl-1.2.2.jar\META-INF\myfaces-html.tld and <GERONIMO_HOME>\repository\org\apache\myfaces\core\myfaces-impl\1.2.2\myfaces-impl-1.2.2.jar\META-INF\myfaces_core.tld
#Next step is to populate login.jsp and welcome.jsp with dataCode Block ActionScript ActionScript borderStyle solid title login.jsp <%@ taglib uri="/WEB-INF/tld/myfaces-html.tld" prefix="h" %> <%@ taglib uri="/WEB-INF/tld/myfaces_core.tld" prefix="f" %> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Welcome to Apache Geronimo</title> </head> <body> <f:view> <h1><h:outputText value="Welcome to Apache Geronimo" /></h1> <h:form> <h:message for="firstName" style="color: red;" /> <h:message for="lastName" style="color: red;" /> <br> <h:outputText value="Enter your first name" /> <br> <h:inputText id="firstName" value="#{firstName.name}" required="true"> <f:validateLength minimum="4" maximum="10" /> </h:inputText> <br> <h:outputText value="Enter your last name" /> <br> <h:inputText id="lastName" value="#{lastName.LName}" required="true"> <f:validateLength minimum="3" maximum="10" /> </h:inputText> <br> <h:commandButton id="submit" action="validated" value="Enter" /> </h:form> </f:view> </body> </html>
Lets now try to understand what each line of code represents.Code Block ActionScript ActionScript borderStyle solid title welcome.jsp <%@ taglib uri="/WEB-INF/tld/myfaces-html.tld" prefix="h"%> <%@ taglib uri="/WEB-INF/tld/myfaces_core.tld" prefix="f"%> <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Welcome</title> </head> <body> <f:view> <h3><h:outputText value="You have successfully Logged in" /> <h:outputText value="#{firstName.name} " /> <h:outputText value="#{lastName.LName}" /> <h:outputText value="!" /></h3> </f:view> </body> </html>
- The first two lines in login.jsp defines two tag libraries
These two sets of tags are defined by JSF. First one with the namespace "h" is used to generate html views. Second one with the namespace "f" handles the core functionalities of JSF like type conversions, validations and listeners for input from user.Code Block ActionScript ActionScript borderStyle solid title Code Snippet from login.jsp <%@ taglib uri="/WEB-INF/tld/myfaces-html.tld" prefix="h" %> and <%@ taglib uri="/WEB-INF/tld/myfaces_core.tld" prefix="f" %>
- The next few lines contains the usual html tags
Code Block ActionScript ActionScript borderStyle solid title Code Snippet from login.jsp <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Welcome to Apache Geronimo</title> </head> <body>
- <f:view>- This tag represents the start of JSF code.
Represents the input tag. id="firstName" and value="firstName.name"Code Block ActionScript ActionScript borderStyle solid title Code Snippet from login.jsp <h:inputText id="firstName" value="#{firstName.name}" required="true">
comes from the Managed Bean. Use the Faces Configuration Editor, Select select firstName bean under Managed Bean tab. The Managed Bean Name is firstName. See the figure below
This completes the implementation of View(V) in the application.
The other tags <f:validateLength> and <h:commandButton> will be explained in the next section.
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- Launch the Faces Configuration Editor by double-clicking on faces-config.xml
- Select the Navigation tab in the Configuration Editor. Under the Palette window select Page. This will select a GUI object, page.
- Drag the mouse over the Navigation Rule Window and click on the window. This will give a Select JSP file window. Select login.jsp as shown in the figure and select OK.
- Similarly add the welcome.jsp page on the Navigation Rule window. See the figure below
- Select Link from the Palette window and join the two pages as shown in the figure
- Select the link and between the two pages and go to properties view and set the value for From Outcome field as validated. This is because of the tag <h:commandButton id="submit" action="validated" value="Enter" />. Once all the input are valid the action taken is validated. See the figure
- Once done have a look the source tab in the Faces Navigation Editor. A <navigation-rule> tag has been introduced into the faces-config.xml. This rule suggests the Controller that if you all the inputs are valid from a form in the /pages/login.jsp, and the action is 'validated', then go to page /pages/welcome.jsp.
Now lets add a index.jsp under WEB-INF as follows
Now what is this login.jsf in the forward path. If you look at the web.xml *.jsf is used as the URL pattern to suggest that forwarded page be taken care by Java Server Faces Servlet.Code Block ActionScript ActionScript borderStyle solid title index.jsp <%@ page language="java" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%> <\!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <body> <jsp:forward page="/pages/login.jsf" /> </body> </html>
This completes the Application Development process. Next step is to deploy and test the application.
Deploy and Test the application
Right Click -click on the project SimpleJSF and Select select Run As --> Run On Server. This will deploy the sample on Apache Geronimo Server and a Login page will be launched.
Lets give some sample inputs
Sample Input1:
First Name: Mickey
Last Name: Mouse
Both the First Name as well as Last Name fulfills the validation rules, so this form will be submitted to controller and according to the navigation rule controller will launch a welcome.jsp page.
Sample Input2:
First Name: Mic
Last Name: Mouse
First Name should be minimum of length=4 but in this case First Name is of length=3. In this case validation will fail and an error message will be generated by controller for First Name field.
Sample Input3:
First Name: Mickey
Last Name: Mo
Last Name should be minimum of length=3 but in this case Last Name is of length=2. In this case validation will fail and an error message will be generated by controller for Last Name field.