Running JSC portlets in liferay 4.0

I have created a portlet in JSC, similar to the "Insert, update, delete" example given in the online JSC tutorials. I have successfully deployed on pluto and jetspeed2 and it ran without any issues succesfully. When I deployed it in liferay and ran it the intial page display all the data in the table accurately, but when I select the dropdown and select another value in the dropdown, I get an exception which causes the whole portlet to crash. I think one problem is the different life cycles of portlets in pluto and liferay, but I am not sure.

This is the error trace, leaveManForm:userDD is my dropdown and LeaveManger is my portlet.

com.sun.rave.web.ui.component.DropDown::The current value of component leaveManForm:userDD does not match any of the selections.

Did you forget to reset the value after changing the options?

07:43:09,227 ERROR [org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/LeaveManager]. [jsp]] Servlet.service() for servlet jsp threw exception

javax.faces.el.PropertyNotFoundException: javax.faces.el.PropertyNotFoundException: Field 'sum' not found in DataProvider.

at com.sun.rave.web.ui.faces.DataProviderPropertyResolver$ValueData.getValue(DataP roviderPropertyResolver.java:341)

at com.sun.rave.web.ui.faces.DataProviderPropertyResolver.getValue(DataProviderPro pertyResolver.java:143)

at com.sun.jsfcl.data.ResultSetPropertyResolver.getValue(ResultSetPropertyResolver .java:63)

at com.sun.faces.el.impl.ArraySuffix.evaluate(ArraySuffix.java:167)

at com.sun.faces.el.impl.ComplexValue.evaluate(ComplexValue.java:151)

at com.sun.faces.el.impl.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl. java:243)

at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:173)

at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:154)

at javax.faces.component.UIOutput.getValue(UIOutput.java:147)

at com.sun.rave.web.ui.component.StaticTextBase.getText(StaticTextBase.java:399)

at com.sun.rave.web.ui.renderer.StaticTextRenderer.renderEnd(StaticTextRenderer.ja va:110)

at com.sun.rave.web.ui.renderer.AbstractRenderer.encodeEnd(AbstractRenderer.java:2 35)

at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:720)

at javax.faces.webapp.UIComponentTag.encodeEnd(UIComponentTag.java:623)

at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:546)

at org.apache.jsp.View_jsp._jspx_meth_ui_staticText_6(View_jsp.java:694)

at org.apache.jsp.View_jsp._jspx_meth_ui_form_0(View_jsp.java:201)

at org.apache.jsp.View_jsp._jspx_meth_f_view_0(View_jsp.java:136)

at org.apache.jsp.View_jsp._jspService(View_jsp.java:103)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFil terChain.java:252)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain .java:173)

at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.jav a:672)

at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher. java:574)

at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.ja va:499)

at com.liferay.portlet.PortletRequestDispatcherImpl.include(PortletRequestDispatch erImpl.java:223)

at com.liferay.portlet.PortletRequestDispatcherImpl.include(PortletRequestDispatch erImpl.java:79)

at com.sun.faces.portlet.ExternalContextImpl.dispatch(ExternalContextImpl.java:124 )

at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)

at com.sun.faces.portlet.ViewHandlerImpl.renderView(ViewHandlerImpl.java:132)

at com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.renderView(ViewHandlerImpl.ja va:311)

at com.sun.faces.portlet.LifecycleImpl$RenderResponsePhase.execute(LifecycleImpl.j ava:702)

at com.sun.faces.portlet.LifecycleImpl.phase(LifecycleImpl.java:323)

at com.sun.faces.portlet.LifecycleImpl.render(LifecycleImpl.java:244)

at com.sun.faces.portlet.FacesPortlet.render(FacesPortlet.java:327)

at com.liferay.portal.shared.servlet.PortletServlet.service(PortletServlet.java:83 )

at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFil terChain.java:252)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain .java:173)

at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.jav a:672)

at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher. java:574)

at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.ja va:499)

at com.liferay.portlet.CachePortlet._invoke(CachePortlet.java:289)

at com.liferay.portlet.CachePortlet.render(CachePortlet.java:153)

at org.apache.jsp.html.portal.render_005fportlet_jsp._jspService(render_005fportle t_jsp.java:629)