chain or redirectAction ResultType

[Sachin Lale]

Hi,
I am migrating an application from struts1.1 to struts 2.2.3.  I have 
two action

  1. InstitutuionAction : The purpose is to prepare the data required
     to display and then forward to a Institution.JSP (using tiles)
  2. InstitutionAddEditAction: This action exposed two methods insert,
     update and validate.

The insert and validate method of InstitutionAddEditAction class looks 
like below

public String insert() throws Exception
    {
        log.info("In 
InstitutionStrutsAddEditAction"+institution.getName());
        return Action.SUCCESS;
    }

public void validate()
    {
        if(institution.getName().equals("abc"))
            addActionError("<font color=\"red\"> Invalid Name .</font>");
    }

struts.xml

<action name="Institution" method="execute" 
class="edu.wustl.clinportal.action.struts2.InstitutionStruts2Action">
<result name="success" type="tiles">.clinportal.institutionDef</result>
<result name="failure" type="tiles">.clinportal.institutionDef</result>
<result name="access_denied" >/ManageAdministrativeData.do</result>
</action>
<action name="InstitutionAddEdit_*" method="{1}" 
class="edu.wustl.clinportal.action.struts2.InstitutionStrutsAddEditAction">
<result name="input" type="redirectAction">
<param name="actionName">Institution</param>
<param name="operation">add</param>
<param name="pageOf">pageOfInstitution</param>
<param name="menuSelected">2</param>
</result>
<result name="success" type="redirectAction">
<param name="actionName">Institution</param>
</result>
</action>

After a validation error it is getting redirect to Institution.action 
but not re-populating the data entered by the users obvious reason as 
the request is redirected and not forward. Everything works fine if i 
replace the result type to chain and could populate the Institution name 
(this object is in InstitutionAddEditAction class).

I added a Institution object in InstitutuionAction  class. I tried the 
same scenarion using chain this time. Its worked as well. Is 
ChainInterceptor populating this object?

But is using chain a recommended approach. What is harm in using chain.?

Best regards,
Sachin