Java EE (Java Enterprise Edition) General Discussion

I've been trying to make a conditional include in a jsf page just like:

      <%
          if ( condition ) {
      %>
      <h:form>
          <jsp:include page="page1.jsp"/>  
      </h:form> 
      <%
            }
      %>

When condition is true everythings is ok. However when condition is false I always get an exception like:

javax.servlet.ServletException: cannot add component with id 'p_1' and path :
{Component-Path : [Class: com.exadel.htmLib.components.UIP,Id: p_1]} 
to its parent component. This might be a problem due to duplicate ids.

I guess that the component tree just cannot be rebuilt successfully when the page is not included.

Any ideas?

Thanks