JSF - Managed Bean to Managed Bean Communication

[Sandeep Dwivedi]

I need to transfer the attribute values from one managed bean to anather managed bean, Could anyone please let me know how to accomplish this?

I want to transfer a list attribute value of ActivePackagesMB.java Managed bean to anather managed bean.

[Bauke Scholtz]

There are several ways. Here are some in the order of my personal preference:

1) Inject the another managed bean as a property of the one managed bean and just use it. Here is an example.

2) Obtain the another managed bean by FacesContext and set it as a property. Here are some ways.

3) Pass it through the session map which you obtain using ExternalContext#getSessionMap(). Let the one bean put the desired value in it and let the other bean get it. Here is an example.

[Jerwin Louise Uy]

An alternative way -

    
        FacesContext facesContext = FacesContext.getCurrentInstance();
        ELContext el = facesContext.getELContext();
        Application app = facesContext.getApplication();
        ExpressionFactory ef = app.getExpressionFactory();
        ValueExpression ve = ef.createValueExpression(el, expression, type);
        return ve.getValue(el);
 
        where expression is the string representation of the el, i.e. "#{someBean.someProperty}"
        type is the Class of the expected returned type
 

Advantages of using this approach is that it will automatically "resolve" the scope of the managed bean that you are after. Of course, you can perform introspection using without actually having to get the actual managed bean.

Regards.

[Sandeep Dwivedi]

Thanks Guys! I highly appreciate your help.