不要通过传递值

Question

I am try to pass a value to other bean, but does not work, apparently the get and set methods are not called.. see my code:

<h:panelGrid columns="3">

<p:outputLabel  
    value="Label: "/>
   <p:inputText id="inputtext" value="#{bean1.title}"/>

<p:button
    value="Submit" 
           outcome="${pageContext.request.contextPath}/pages/formBean2">
           <f:param name="value" value="#{bean1.title}"/>
</p:button>

Bean2

@PostConstruct
public void init() {

   String title = Util.getRequestParameter("value");
   method();//this method need of variable title

}

Util

public static String getRequestParameter(String name) {
   return FacesContext.getCurrentInstance().getExternalContext()
             .getRequestParameterMap().get(name);
 }

Well, i dont know why but it always sends the value null.

someone has an idea of ​​what the problem is?

Answer 1

I wont dive into the issue since you are using a wrong approach on JSF and I think I can guide you in the right direction.

You should access the title value of Bean1 from the Bean2 .

You need to use a ManagedProperty like this example (not tested):

public class Bean2 {

    @ManagedProperty //maybe youll need (value="#{bean1}")
    private Bean1 bean1;

    // Getter and setter for Bean1

}

After you fire your request the JSF framework will apply your title value on the Bean1 . It belongs to that bean, so keep it there.

In your action in Bean2 you can then make a getTitle() from Bean1 reference. The title is going to be there, and the container is going to inject the dependency from Bean1 into Bean2 .

This is the right way to do it.

I recommend you to do a quick example outside your application so you can see that it works, and afterwards you can adapt to your project.

See this example: Injecting Managed Beans In JSF 2.0

UPDATE

Notice that if you are using ViewScoped beans you need to stay in the same application (aka page) in order to access injected beans. If you need to navigate between views, you gonna need Faces Flow .