html:file tag and exception in validate method

[atta ur rehman]

Dear all,

One of our JSP has html:file tag in it. Whenever validate method of the associated 
ActionFrom returns any errors, the JSP container throws ClassCastException.

java.lang.ClassCastException
        at 
com.newatlanta.servletexec.SERequestDispatcher.forward(SERequestDispatcher.java:171)
        at 
com.newatlanta.servletexec.SERequestDispatcher.forward(SERequestDispatcher.java:114)
        at 
org.apache.struts.tiles.ActionComponentServlet.processForward(ActionComponentServlet.java:277)
        at 
org.apache.struts.tiles.ActionComponentServlet.processValidate(ActionComponentServlet.java:211)
        at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1565)
        at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:510)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

Disabling the validate method or returning null from it works just fine!

TIA for any help. BTW, we have STRUTS 1.0.2.

Regards,

ATTA