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| <h1>JSF Application that uses managed-bean and ejb</h1> |
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| <p>This is a simple web-app showing how to use dependency injection in JSF managed beans using TomEE.</p> |
| <p>It contains a Local Stateless session bean <code>CalculatorImpl</code> which adds two numbers and returns the result. The application also contains a JSF managed bean <code>CalculatorBean</code>, which uses the EJB to add two numbers and display the results to the user. The EJB is injected in the managed bean using <code>@EJB</code> annotation.</p> |
| <h2>A little note on the setup:</h2> |
| <p>You could run this in the latest Apache TomEE <a href="https://repository.apache.org/content/repositories/snapshots/org/apache/openejb/apache-tomee/">snapshot</a></p> |
| <p>As for the libraries, myfaces-api and myfaces-impl are provided in tomee/lib and hence they should not be a part of the war. In maven terms, they would be with scope 'provided'</p> |
| <p>Also note that we use servlet 2.5 declaration in web.xml</p> |
| <pre><code><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
| xmlns="http://java.sun.com/xml/ns/javaee" |
| xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" |
| xsi:schemaLocation="http://java.sun.com/xml/ns/javaee |
| http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" |
| version="2.5"> |
| </code></pre> |
| <p>And we use 2.0 version of faces-config</p> |
| <p><faces-config xmlns="http://java.sun.com/xml/ns/javaee"<br/> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"<br/> xsi:schemaLocation="http://java.sun.com/xml/ns/javaee<br/> <a href="http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd">http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd</a>"<br/> version="2.0"></p> |
| <p>The complete source code is provided below but let's break down to look at some smaller snippets and see how it works.</p> |
| <p>We'll first declare the <code>FacesServlet</code> in the <code>web.xml</code></p> |
| <pre><code> <servlet> |
| <servlet-name>Faces Servlet</servlet-name> |
| <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> |
| <load-on-startup>1</load-on-startup> |
| </servlet> |
| </code></pre> |
| <p><code>FacesServlet</code> acts as the master controller.</p> |
| <p>We'll then create the <code>calculator.xhtml</code> file.</p> |
| <pre><code> <h:outputText value='Enter first number'/> |
| <h:inputText value='#{calculatorBean.x}'/> |
| <h:outputText value='Enter second number'/> |
| <h:inputText value='#{calculatorBean.y}'/> |
| <h:commandButton action="#{calculatorBean.add}" value="Add"/> |
| </code></pre> |
| <p>Notice how we've use the bean here. By default it is the simple class name of the managed bean.</p> |
| <p>When a request comes in, the bean is instantiated and placed in the appropriate scope. By default, the bean is placed in the request scope.</p> |
| <pre><code> <h:inputText value='#{calculatorBean.x}'/> |
| </code></pre> |
| <p>Here, getX() method of calculatorBean is invoked and the resulting value is displayed. x being a Double, we rightly should see 0.0 displayed.</p> |
| <p>When you change the value and submit the form, these entered values are bound using the setters in the bean and then the commandButton-action method is invoked.</p> |
| <p>In this case, <code>CalculatorBean#add()</code> is invoked.</p> |
| <p><code>Calculator#add()</code> delegates the work to the ejb, gets the result, stores it<br/>and then instructs what view is to be rendered.</p> |
| <p>You're right. The return value "success" is checked up in faces-config navigation-rules and the respective page is rendered.</p> |
| <p>In our case, <code>result.xhtml</code> page is rendered.</p> |
| <p>The request scoped <code>calculatorBean</code> is available here, and we use EL to display the values.</p> |
| <h2>Source</h2> |
| <h2>Calculator</h2> |
| <pre><code>package org.superbiz.jsf; |
| |
| import javax.ejb.Local; |
| |
| @Local |
| public interface Calculator { |
| public double add(double x, double y); |
| } |
| </code></pre> |
| <h2>CalculatorBean</h2> |
| <pre><code>package org.superbiz.jsf; |
| |
| import javax.ejb.EJB; |
| import javax.faces.bean.ManagedBean; |
| |
| @ManagedBean |
| public class CalculatorBean { |
| @EJB |
| Calculator calculator; |
| private double x; |
| private double y; |
| private double result; |
| |
| public double getX() { |
| return x; |
| } |
| |
| public void setX(double x) { |
| this.x = x; |
| } |
| |
| public double getY() { |
| return y; |
| } |
| |
| public void setY(double y) { |
| this.y = y; |
| } |
| |
| public double getResult() { |
| return result; |
| } |
| |
| public void setResult(double result) { |
| this.result = result; |
| } |
| |
| public String add() { |
| result = calculator.add(x, y); |
| return "success"; |
| } |
| } |
| </code></pre> |
| <h2>CalculatorImpl</h2> |
| <pre><code>package org.superbiz.jsf; |
| |
| import javax.ejb.Stateless; |
| |
| @Stateless |
| public class CalculatorImpl implements Calculator { |
| |
| public double add(double x, double y) { |
| return x + y; |
| } |
| } |
| </code></pre> |
| <h1>web.xml</h1> |
| <pre><code><?xml version="1.0"?> |
| |
| <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
| xmlns="http://java.sun.com/xml/ns/javaee" |
| xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" |
| xsi:schemaLocation="http://java.sun.com/xml/ns/javaee |
| http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" |
| version="2.5"> |
| |
| <description>MyProject web.xml</description> |
| |
| <!-- Faces Servlet --> |
| <servlet> |
| <servlet-name>Faces Servlet</servlet-name> |
| <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> |
| <load-on-startup>1</load-on-startup> |
| </servlet> |
| |
| <!-- Faces Servlet Mapping --> |
| <servlet-mapping> |
| <servlet-name>Faces Servlet</servlet-name> |
| <url-pattern>*.jsf</url-pattern> |
| </servlet-mapping> |
| |
| <!-- Welcome files --> |
| <welcome-file-list> |
| <welcome-file>index.jsp</welcome-file> |
| <welcome-file>index.html</welcome-file> |
| </welcome-file-list> |
| </web-app> |
| </code></pre> |
| <h2>Calculator.xhtml</h2> |
| <pre><code><?xml version="1.0" encoding="UTF-8"?> |
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" |
| "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
| <html xmlns="http://www.w3.org/1999/xhtml" |
| xmlns:f="http://java.sun.com/jsf/core" |
| xmlns:h="http://java.sun.com/jsf/html"> |
| |
| |
| <h:body bgcolor="white"> |
| <f:view> |
| <h:form> |
| <h:panelGrid columns="2"> |
| <h:outputText value='Enter first number'/> |
| <h:inputText value='#{calculatorBean.x}'/> |
| <h:outputText value='Enter second number'/> |
| <h:inputText value='#{calculatorBean.y}'/> |
| <h:commandButton action="#{calculatorBean.add}" value="Add"/> |
| </h:panelGrid> |
| </h:form> |
| </f:view> |
| </h:body> |
| </html> |
| </code></pre> |
| <h2>Result.xhtml</h2> |
| <pre><code><?xml version="1.0" encoding="UTF-8"?> |
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" |
| "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
| <html xmlns="http://www.w3.org/1999/xhtml" |
| xmlns:f="http://java.sun.com/jsf/core" |
| xmlns:h="http://java.sun.com/jsf/html"> |
| |
| <h:body> |
| <f:view> |
| <h:form id="mainForm"> |
| <h2><h:outputText value="Result of adding #{calculatorBean.x} and #{calculatorBean.y} is #{calculatorBean.result }"/></h2> |
| <h:commandLink action="back"> |
| <h:outputText value="Home"/> |
| </h:commandLink> |
| </h:form> |
| </f:view> |
| </h:body> |
| </html> |
| </code></pre> |
| <h1>faces-config.xml</h1> |
| <pre><code><?xml version="1.0"?> |
| <faces-config xmlns="http://java.sun.com/xml/ns/javaee" |
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
| xsi:schemaLocation="http://java.sun.com/xml/ns/javaee |
| http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd" |
| version="2.0"> |
| |
| <navigation-rule> |
| <from-view-id>/calculator.xhtml</from-view-id> |
| <navigation-case> |
| <from-outcome>success</from-outcome> |
| <to-view-id>/result.xhtml</to-view-id> |
| </navigation-case> |
| </navigation-rule> |
| |
| <navigation-rule> |
| <from-view-id>/result.xhtml</from-view-id> |
| <navigation-case> |
| <from-outcome>back</from-outcome> |
| <to-view-id>/calculator.xhtml</to-view-id> |
| </navigation-case> |
| </navigation-rule> |
| </faces-config> |
| </code></pre> |
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