[jboss-user] [JBoss jBPM] - problem while saving taskform varibles

[gsccnu]

this is  my  *.xhtml

  | xmlns:t="http://myfaces.apache.org/tomahawk"
  | ......................
  | <ga:responseActions>
  |         <id:listUsers target="#{users}" />
  | </ga:responseActions>
  | <h:selectOneMenu  required="true" value="#{var['collection1']}">
  |         <t:selectItems value="#{users}" var="user" itemLabel="#{user.name}" itemValue="#{user.name}" />
  |       </h:selectOneMenu>
  | 
When i examine this task,every things is fine. But when I put down "Save",i get exceptions.
 
  | javax.el.PropertyNotFoundException: /50/assignA.xhtml @33,83 value="#{var['collection1']}": Target Unreachable, identifier 'var' resolved to null
  | 	com.sun.facelets.el.TagValueExpression.getType(TagValueExpression.java:62)
  | 	com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:81)
  | 	com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectOneValue(MenuRenderer.java:166)
  | 	com.sun.faces.renderkit.html_basic.MenuRenderer.getConvertedValue(MenuRenderer.java:328)
  | 	javax.faces.component.UIInput.getConvertedValue(UIInput.java:936)
  | 	javax.faces.component.UIInput.validate(UIInput.java:861)
  | 	javax.faces.component.UIInput.executeValidate(UIInput.java:1071)
  | 	javax.faces.component.UIInput.processValidators(UIInput.java:663)
  | 	javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1021)
  | 	javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1021)
  | 	javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1021)
  | 	javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1021)
  | 	javax.faces.component.UIForm.processValidators(UIForm.java:229)
  | 	javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1021)
  | 	javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1021)
  | 	javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1021)
  | 	javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:662)
  | 	com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:100)
  | 	com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:248)
  | 	com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
  | 	javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
  | 	org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:147)
  | 

Thanks in advance

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