[jboss-user] [JBoss Seam] - UnsupportedOperationException at conversationList

[b.reeve]

I was trying to implement a simple non-EJB appliaction using Seam and JSF. Multiple conversation is working fine for me. But, when i try to check for the workspace management, I am getting unsupportedOperationException at conversationList variable.
I have the view-ids and descriptions inside my pages.xml file. 
<div class="section">
  |     <h:form>
  |         <h:outputText value="#{empty conversationList}" />
  |     </h:form>
  | </div>
This code is throwing exception. But i can access the conversationEntries. I tried to print the conversationEntries at the console and I am getting the values. 
The stack trace is as follows:

java.lang.UnsupportedOperationException
  | 	at org.jboss.seam.Namespace.entrySet(Namespace.java:23)
  | 	at java.util.AbstractMap.toString(Unknown Source)
  | 	at java.lang.String.valueOf(Unknown Source)
  | 	at java.lang.StringBuilder.append(Unknown Source)
  | 	at com.sun.webui.jsf.faces.UIComponentELResolver.getValue(UIComponentELResolver.java:72)
  | 	at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
  | 	at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:64)
  | 	at org.apache.el.parser.AstValue.getValue(AstValue.java:97)
  | 	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
  | 	at com.sun.faces.application.ValueBindingValueExpressionAdapter.getValue(ValueBindingValueExpressionAdapter.java:102)
  | 	at org.jboss.seam.core.Expressions$1.getValue(Expressions.java:69)
  | 	at org.jboss.seam.Component.getInstanceFromFactory(Component.java:1684)
  | 	at org.jboss.seam.Component.getInstance(Component.java:1633)
  | 	at org.jboss.seam.Component.getInstance(Component.java:1610)
  | 	at org.jboss.seam.Component.getInstance(Component.java:1604)
  | 	at org.jboss.seam.jsf.SeamELResolver.getValue(SeamELResolver.java:49)
  | 	at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
  | 	at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:64)
  | 	at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:45)
  | 	at org.apache.el.parser.AstEmpty.getValue(AstEmpty.java:29)
  | 	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
  | 	at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)
  | 	at javax.faces.component.UIOutput.getValue(UIOutput.java:173)
  | 	at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:189)
  | 	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:320)
  | 	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:200)
  | 	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:836)
  | 	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:896)
  | 	at javax.faces.render.Renderer.encodeChildren(Renderer.java:137)
  | 	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:812)
  | 	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886)
  | 	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892)
  | 	at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:571)
  | 	at org.ajax4jsf.framework.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
  | 	at org.ajax4jsf.framework.ajax.AjaxViewHandler.renderView(AjaxViewHandler.java:256)
  | 	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
  | 	at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
  | 	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
  | 	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  | 	at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:63)
  | 	at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
  | 	at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  | 	at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:57)
  | 	at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  | 	at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:79)
  | 	at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  | 	at org.jboss.seam.web.SeamFilter.doFilter(SeamFilter.java:84)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  | 	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
  | 	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
  | 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
  | 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
  | 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
  | 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
  | 	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
  | 	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
  | 	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
  | 	at java.lang.Thread.run(Unknown Source)
  | 

Could anyone please help me. TIA

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