problema con un rd.forward(request,response)

[tiriflores]

protected void processRequest(HttpServletRequest request,

HttpServletResponse response)
throws ServletException, IOException {

Context contexto = null;
Context contexto2 = null;
iTicketHome miHome = null;
proAlmacenHome miHome2 = null;
String nid =request.getParameter("nid");
String cantidad=request.getParameter("cantidad");
try
{
contexto = new InitialContext();
Object objetoGenerico = contexto.lookup("ticketejb");
miHome = (iTicketHome)

PortableRemoteObject.narrow(objetoGenerico,iTicket Home.class);
iTicket ejbGestorTicket = miHome.create();
Integer nidi=Integer.valueOf(nid);
ticketcmp

ticket=ejbGestorTicket.recuperaticketPorId2(nidi);
String nref=ticket.getNref();

if (ticket==null){

}else{
ticket.remove();

RequestDispatcher rd =

getServletContext().getNamedDispatcher("servletcan tidad");
if (rd == null){

}
String vector= request.getParameter("nid");
request.setAttribute("nref",nref);

request.setAttribute("cantidad",cantidad);


************************************************** **********

rd.forward(request,response);



************************************************** **********

getServletConfig().getServletContext().getRequestD ispatcher("/cajanorma

l2.jsp").forward(request, response);

}

}
catch(Exception e) {


e.printStackTrace();
}


}

hola tengo ese servletk elimina un ticket y quiero que una vez

eliminado m vaya al servletcantidad para operar con la cantidad sumar o

restar segun el caso pero cuadno llego al rd.froward(request,reponse)

error como sigue:

java.rmi.RemoteException: nested exception is:

java.lang.NullPointerException; nested exception is:
java.lang.NullPointerException
at

com.sun.enterprise.iiop.POAProtocolMgr.mapExceptio n(POAProtocolMgr.java

:389)
at

com.sun.ejb.containers.BaseContainer.postInvoke(Ba seContainer.java:431)
at

ejbalmacen.AlmacenbeanBean_PM_RemoteHomeImpl.findB yPrimaryKey(Almacenbe

anBean_PM_RemoteHomeImpl.java:61)
at ejbalmacen._AlmacenbeanHome_Stub.findByPrimaryKey( Unknown

Source)
at servletcantidad.processRequest(servletcantidad.jav a:67)
at servletcantidad.doGet(servletcantidad.java:109)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:853)
at

org.apache.catalina.core.ApplicationDispatcher.inv oke(ApplicationDispat

cher.java:683)
at

org.apache.catalina.core.ApplicationDispatcher.doF orward(ApplicationDis

patcher.java:403)
at

org.apache.catalina.core.ApplicationDispatcher.acc ess$0(ApplicationDisp

atcher.java:359)
at

org.apache.catalina.core.ApplicationDispatcher$Pri vilegedForward.run(Ap

plicationDispatcher.java:130)
at java.security.AccessController.doPrivileged(Native Method)
at

org.apache.catalina.core.ApplicationDispatcher.for ward(ApplicationDispa

tcher.java:347)
at servletTicketE.processRequest(servletTicketE.java: 90)
at servletTicketE.doGet(servletTicketE.java:118)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:853)
at

org.apache.catalina.servlets.InvokerServlet.serveR equest(InvokerServlet

.java:446)
at

org.apache.catalina.servlets.InvokerServlet.doGet( InvokerServlet.java:1

80)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:853)
at

org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(Applic

ationFilterChain.java:247)
at

org.apache.catalina.core.ApplicationFilterChain.ac cess$0(ApplicationFil

terChain.java:197)
at

org.apache.catalina.core.ApplicationFilterChain$1. run(ApplicationFilter

Chain.java:176)
at java.security.AccessController.doPrivileged(Native Method)
at

org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFil

terChain.java:172)
at

org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperVal

ve.java:243)
at

org.apache.catalina.core.StandardPipeline.invokeNe xt(StandardPipeline.java:566)
at

org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:

472)
at

org.apache.catalina.core.ContainerBase.invoke(Cont ainerBase.java:943)
at

org.apache.catalina.core.StandardContextValve.invo ke(StandardContextVal

ve.java:201)
at

org.apache.catalina.core.StandardPipeline.invokeNe xt(StandardPipeline.j

ava:566)
at

org.apache.catalina.valves.CertificatesValve.invok e(CertificatesValve.j

ava:246)
at

org.apache.catalina.core.StandardPipeline.invokeNe xt(StandardPipeline.j

ava:564)
at

org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:

472)
at

org.apache.catalina.core.ContainerBase.invoke(Cont ainerBase.java:943)
at

org.apache.catalina.core.StandardContext.invoke(St andardContext.java:23

43)
at

org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.jav

a:164)
at

org.apache.catalina.core.StandardPipeline.invokeNe xt(StandardPipeline.j

ava:566)
at

org.apache.catalina.valves.ErrorDispatcherValve.in voke(ErrorDispatcherV

alve.java:170)
at

org.apache.catalina.core.StandardPipeline.invokeNe xt(StandardPipeline.j

ava:564)
at

org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.jav

a:170)
at

org.apache.catalina.core.StandardPipeline.invokeNe xt(StandardPipeline.j

ava:564)
at

org.apache.catalina.authenticator.SingleSignOn.inv oke(SingleSignOn.java

:368)
at

org.apache.catalina.core.StandardPipeline.invokeNe xt(StandardPipeline.j

ava:564)
at

org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:

472)
at

org.apache.catalina.core.ContainerBase.invoke(Cont ainerBase.java:943)
at

org.apache.catalina.core.StandardEngineValve.invok e(StandardEngineValve

.java:174)
at

org.apache.catalina.core.StandardPipeline.invokeNe xt(StandardPipeline.j

ava:566)
at

org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:

472)
at

org.apache.catalina.core.ContainerBase.invoke(Cont ainerBase.java:943)
at

org.apache.catalina.connector.http.HttpProcessor.p rocess(HttpProcessor.

java:1012)
at

org.apache.catalina.connector.http.HttpProcessor.r un(HttpProcessor.java

:1107)
at java.lang.Thread.run(Thread.java:534)
Caused by: java.lang.NullPointerException
at

com.sun.ejb.persistence.PartitionImpl$PersistentKe y.hashCode(PartitionI

mpl.java:501)
at java.util.HashMap.hash(HashMap.java:261)
at java.util.HashMap.get(HashMap.java:317)
at

com.sun.ejb.persistence.PartitionImpl.ejbFindByPri maryKey(PartitionImpl

.java:710)
at

ejbalmacen.AlmacenbeanBean_PM.ejbFindByPrimaryKey( AlmacenbeanBean_PM.ja

va:203)
at

ejbalmacen.AlmacenbeanBean_PM_RemoteHomeImpl.findB yPrimaryKey(Almacenbe

anBean_PM_RemoteHomeImpl.java:56)
... 52 more

tengo que decir que si quito el forward el ticket se elimina y m

redirije de nuevo a donde quiero eso si sin ir al servlet pero si lo

pongo error a ver si alguien sabe decirme que puede ser muchas gracias