ADF Task Flow Method Call Activities With Parameters and Return type

Method call activities allow to call a custom method.It invokes the method before the application render the page.This approach is better than invokeAction in the page def file.You may need to use invokeAction for the following cases

• Method needs to execute more than one phase of page's lifecycle 
• Reuse the page and page def file with the method in it 
• Not using adf controller 

Create a managed bean in the request scope 

package test.view;

public class MethodCall {

    public MethodCall() {

        super();

    }

  

    public String testMyReturn(String a) {

        System.out.println(" Arg ="+a);

        return "Test Arg="+a;

    }

}

Create a bounded task flow with the method call 

Method call activity has the following 

• Method using EL 
• Optional Parameters with class and value 
• Optional return type of the method stores in a variable.

methCall_view.jspx 

<?xml version='1.0' encoding='UTF-8'?>

<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1" xmlns:af="http://xmlns.oracle.com/adf/faces/rich">

  <af:panelGroupLayout id="pgl1">

    <af:outputText value="#{pageFlowScope.testReturn}" id="ot1"/>

  </af:panelGroupLayout>

</jsp:root>

Drag and drop the task flow as a region in testMethCall.jspx and Run the page.