HTTP 500 error when trying to submit PPI survey

Note, I've only repro-ed this on the test server, not on a clean db.

Arpita-- can you try to repro this on a clean db and see if the bug still
exists?

To Repro:
Search for client (in test server "Mauricio Papasodaro")
Click on loan account
Click "Attach a survey", select PPI India survey, fill out questions,
hit "submit"

Actual:
You receive an http 500 error-- see below.

Expected:
You should be taken to preview page.

HTTP Status 500 -

--------------------------------------------------------------------------------
type Exception report

message

description The server encountered an internal error () that prevented it from
fulfilling this request.

exception

javax.servlet.ServletException: java.lang.ClassCastException:
org.mifos.application.surveys.business.QuestionChoice
org.apache.struts.action.RequestProcessor.processException
(RequestProcessor.java:523)
org.mifos.framework.struts.action.MifosRequestProcessor.processActionPer
form(MifosRequestProcessor.java:261)
org.apache.struts.action.RequestProcessor.process
(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.mifos.framework.security.util.LoginFilter.doFilter
(LoginFilter.java:109)
org.mifos.framework.persistence.DatabaseVersionFilter.doFilter
(DatabaseVersionFilter.java:39)

root cause

java.lang.ClassCastException:
org.mifos.application.surveys.business.QuestionChoice
org.mifos.framework.util.helpers.PPICalculator.calculateScore
(PPICalculator.java:17)
org.mifos.application.surveys.struts.action.SurveyInstanceAction.preview
(SurveyInstanceAction.java:570)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.apache.struts.actions.DispatchAction.dispatchMethod
(DispatchAction.java:274)
org.apache.struts.actions.DispatchAction.execute
(DispatchAction.java:194)
org.mifos.framework.struts.action.BaseAction.execute(BaseAction.java:73)
org.mifos.framework.struts.action.MifosRequestProcessor.processActionPer
form(MifosRequestProcessor.java:227)
org.apache.struts.action.RequestProcessor.process
(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.mifos.framework.security.util.LoginFilter.doFilter
(LoginFilter.java:109)
org.mifos.framework.persistence.DatabaseVersionFilter.doFilter
(DatabaseVersionFilter.java:39)

note The full stack trace of the root cause is available in the Apache
Tomcat/6.0.14 logs.

--------------------------------------------------------------------------------
Apache Tomcat/6.0.14