How ClassCastException causing ?

[AllanHuang 英旗]

Hi ~~   I test a integration testing with Cactus, then there is a situation cause exceptional event.   Situation : JDK  1.4.1_03 Cactus 1.4.1   If there is a test method inside the testcase ...   JavaBean : public class A1 {   private final ServletContext context;   private HttpServletRequest request;    private HttpServletResponse response;     ... ... ...     public void F1 ( ) {      ServletContext tContext = this.getContext();      tContext.getRequestDispatcher("/webpage1.jsp").forward(this.request, this.response);   } }   webpage.jsp :     A1 a1 = new A1(this.context, this.request, this.response) ;      a1.F1( ) ;   then I execute TestCase1 :   public class TestCase1 extend JspTestCase {    public void testJsp ( ) {       ... ... ...       pageContext.forward("/webpage.jsp");       ... ... ...    } }    Result in :   java.lang.ClassCastException  at org.apache.cactus.server.RequestDispatcherWrapper.dispatch179_forward(RequestDispatcherWrapper.java;org/apache/cactus/util/log/LogAspect.aj(1k):102)  at org.apache.cactus.server.RequestDispatcherWrapper.around179_forward(RequestDispatcherWrapper.java;org/apache/cactus/util/log/LogAspect.aj(1k):1156)  at org.apache.cactus.server.RequestDispatcherWrapper.forward(RequestDispatcherWrapper.java;org/apache/cactus/util/log/LogAspect.aj(1k):99)   but I execute TestCase2 :   public class TestCase2 extend JspTestCase {    public void testJsp ( ) {       ... ... ...       A1 a1 = new A1(this.context, this.request, this.response) ;        a1.F1( ) ;             ... ... ...    } }    Result in :  OK !   What happen that forward (request, response ) methd of pageContext in the test method ? Do the situation mean I can't use JavaBean to do forward in cactus ?                                                                                                                                        Regrad                                                                                                                                                     Allan