Error while PrePopulating Name in Opportunity

Question

I want to prepoulate Name field on opportunity with text as "System Generated".

I have written created a VF page

<apex:page standardController="Opportunity" extensions="DefaultOpprtunityNameController" action="{!redirect}"/>

and its controller as

public with sharing class DefaultOpprtunityNameController {

public DefaultOpprtunityNameController(ApexPages.StandardController controller) {

}


public PageReference redirect() {
    PageReference pr = new PageReference('/006/e');
    Map<String, String> m = pr.getParameters();
    // Keep existing parameters
    m.putAll(ApexPages.currentPage().getParameters());
    // Add Opportunity name parameter
    m.put('opp3', '<System Generated>');
    m.put('opp11', 'Requested Info');
    m.put('opp12', '25');
    // Turn off the override so you go to the default UI page (and not an infinite loop)
    m.put('nooverride', '1');
    return pr;
}

}

And overrided standerd Opportunity "New" button with the above VF page

But I am getting an error

Error: Invalid Data.
Review all error messages below to correct your data. The page you submitted was invalid for your session. Please click Save again to confirm your change.

Answer 1

The problem appears to be with grabbing the parameters from the page where the "New" button is clicked. Try eliminating this line and that should eliminate the error.

m.putAll(ApexPages.currentPage().getParameters());