selectManyPicklist for edit

[Alin Dosoniu]

Hello,   I want to use selectManyPicklist component for editing a list of values that were selected on a previous access of the page. I don't know how I can have some elements in selected option. I tried to use the "value" attribute of selectManyPicklist but I get this error:   Caused by: org.apache.jasper.JasperException: Value is no String and component body:fn:invTypeswith path: {Component-Path : [Class: javax.faces.component.UIViewRoot,ViewId: /app/programmings_new.jsp][Class: javax.faces.component.html.HtmlPanelGrid,Id: _idJsp13][Class: javax.faces.component.UINamingContainer,Id: body][Class: javax.faces.component.html.HtmlPanelGroup,Id: _idJsp19][Class: javax.faces.component.html.HtmlForm,Id: fn][Class: javax.faces.component.html.HtmlPanelGrid,Id: _idJsp20][Class: javax.faces.component.html.HtmlPanelGroup,Id: _idJsp33][Class: org.apache.myfaces.custom.picklist.HtmlSelectManyPicklist,Id: invTypes]} does not have a Converter  at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370)  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(ApplicationFilterChain.java:252)  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)   I used the selectManyPicklist component to successfully select some items from available list when made the save of the object. But now I want to edit the object.   Thank you, Alin.