JSF Tip: Passing objects to managed beans

Let suppose that we have the following two beans:

@Named

@RequestScoped

public class BeanA {      

}

@Named

@RequestScoped

public class BeanB {

   

 private BeanA beanA;

 public BeanA getBeanA() {

  return beanA;

 }

 public void setBeanA(BeanA beanA) {

  this.beanA = beanA;

 }

   

 public void beanBAction(){

  System.out.println(beanA);

 }  

}

And, we need a command button that invoke BeanB#beanBAction() method and pass an instance of BeanA also. Well, you can quickly achieve this via <f:setPropertyActionListener/>, as below:

<h:form>

 <h:commandButton value="Action BeanB" action="#{beanB.beanBAction()}">              

  <f:setPropertyActionListener target="#{beanB.beanA}" value="#{beanA}" />

 </h:commandButton>

</h:form>   

Via this tip, you can easy shape the state design pattern (see JSF and State design pattern - part I)