Hi,

First of all JSF does't support nested forms.

In your Xhtml page i cant find your method like,may be for displaying you have give it for dummy.

public void saveData(ActionEvent event){

     //code

}

For Example,

<h:commandButton action="#{urBean.downloadImage}" value="Download Image" type="submit" >

public void downloadImage()

{

    //ur code

}

The action attribute accepts a method-binding expression for a backing bean action method to invoke when this component is activated by the user. An action method must be a public method with no parameters that returns a String. The returned string represents the logical outcome of the action (eg. "success", "failure", etc. ) and is used by the JavaServer Faces MVC framework to determine which view to display next.

<h:commandButton actionListener="#{urBean.downloadImage}" value="Download Image" type="submit" >

public void downloadImage(ActionEvent ae)

{

    //ur code

}

The actionListener attribute accepts a method-binding expression for a backing bean action listener method that will be notified when this component is activated by the user. An action listener method must be a public method with an ActionEvent parameter and a void return type.

I can find only the below code from you application,

<a4j:commandButton  value="Remove File" actionListener="#{fileUploadController.removeFile}" reRender="data"></a4j:commandButton>

So please debug it.

Thanks,

Siva