[jboss-user] [JBoss Seam] - Re: Question regarding performance and multiple JavaBean bij

Tue Apr 24 19:09:25 EDT 2007

I've done some research and a mini test application to show my results:

The bean

  | import org.jboss.seam.annotations.In;
  | import org.jboss.seam.annotations.Logger;
  | import org.jboss.seam.annotations.Name;
  | import org.jboss.seam.annotations.Out;
  | import org.jboss.seam.log.Log;
  | import javax.faces.context.FacesContext;
  | 
  | @Name("testBean")
  | public class TestBean {
  |     @Logger Log log;
  | 
  |     @In
  |     public void setFacesContext(FacesContext facesContext) {
  |         log.debug(" === Inject: @In setFacesContext.");
  |     }
  | 
  |     @Out
  |     private String testValue = "test value";
  | 
  |     public String getTestValue() {
  |         return testValue;
  |     }
  | }
  | 

The view

  | <?xml version="1.0" ?>
  | <jsp:root version="2.0"
  |           xmlns="http://www.w3.org/1999/xhtml"
  |           xmlns:jsp="http://java.sun.com/JSP/Page"
  |           xmlns:h="http://java.sun.com/jsf/html"
  |           xmlns:f="http://java.sun.com/jsf/core"
  |           xmlns:ui="http://java.sun.com/jsf/facelets">
  |     <html>
  |     <body>
  |     <f:view>
  |         <h1><h:outputText value="Test Page"/></h1>
  |         <h:form id="form1">
  |             <h1>Bean access</h1>
  |             <h:outputText value="Property: #{testBean.testValue}" /><br/>
  |             <h:outputText value="Property: #{testBean.testValue}" /><br/>
  |             <h:outputText value="@Out Value: #{testValue}" /><br/>
  |             <h:outputText value="@Out Value: #{testValue}" /><br/>
  |             <h:outputText value="@Out Value: #{testValue}" /><br/>
  |         </h:form>
  |     </f:view>
  |     </body>
  |     </html>
  | </jsp:root>
  | 

The result is that facesContext is injected 4 times - twice for each #{testBean.testValue}. Adding another #{testBean.testValue} will force two more injections! 

The #{testValue} on the other hand does not enforce any injections.

Now I wonder: 
* Is this behavior a bug? 
* Do I get this behaviour because I'm using JavaBeans instead of EJB3 SessionBeans?

Also:
* To get the @Out outjection to work, I must first access the bean (with #{testBean.testValue} for instance). Is there another way to "wake up" the bean so that @Out works?

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