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Dificuldade com redirecionamento

Galera alguem pode me ajudar, quero fazer algo do tipo no meu controller

@Post
    public void logar(String email_login,String senha_login,Result result){


        if(dao.validaLogin(email_login, senha_login)){


             result.redirectTo(PromocaoController.class).listagem();        
        }
            result.redirectTo(this).autentica(result);
    }

se o metodo validaLogin retornar true eu vou redirecionar para a pagina de listagem, senão eu deixo na mesma pagina ou mando para autentica (que é a mesma) . mais sempre cai nesse erro:

set 20, 2015 11:01:57 AM org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet [default] in context with path [/save] threw exception [net.vidageek.mirror.exception.ReflectionProviderException: Could not invoke method logar] with root cause
java.lang.IllegalStateException: Cannot forward after response has been committed
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:328)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318)
    at br.com.caelum.vraptor.view.DefaultPageResult$1.intercept(DefaultPageResult.java:135)
    at br.com.caelum.vraptor.proxy.JavassistProxifier$MethodInvocationAdapter.invoke(JavassistProxifier.java:106)
    at br.com.save.controller.IndexController_$$_jvst5a4_4.autentica(IndexController_$$_jvst5a4_4.java)
    at br.com.save.controller.IndexController.logar(IndexController.java:35)
    at br.com.save.controller.IndexController$Proxy$_$$_WeldClientProxy.logar(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at net.vidageek.mirror.provider.java.PureJavaMethodReflectionProvider.invoke(PureJavaMethodReflectionProvider.java:38)
    at net.vidageek.mirror.invoke.MethodHandlerByMethod.withArgs(MethodHandlerByMethod.java:54)
    at br.com.caelum.vraptor.observer.ExecuteMethod.execute(ExecuteMethod.java:87)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:93)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:266)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:253)
    at org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:232)
    at org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:169)
    at org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:165)
    at org.jboss.weld.event.ObserverNotifier.notifyObservers(ObserverNotifier.java:119)
    at org.jboss.weld.event.ObserverNotifier.fireEvent(ObserverNotifier.java:112)
    at org.jboss.weld.event.EventImpl.fire(EventImpl.java:83)
    at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:78)
    at br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:98)
    at br.com.caelum.vraptor.interceptor.FlashInterceptor$Proxy$_$$_WeldClientProxy.intercept(Unknown Source)
    at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:58)
    at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:83)
    at br.com.caelum.vraptor.core.DefaultInterceptorStack$Proxy$_$$_WeldClientProxy.next(Unknown Source)
    at br.com.caelum.vraptor.interceptor.DefaultSimpleInterceptorStack.next(DefaultSimpleInterceptorStack.java:49)
    at br.com.caelum.vraptor.interceptor.DefaultSimpleInterceptorStack$Proxy$_$$_WeldClientProxy.next(Unknown Source)
    at br.com.caelum.vraptor.jpa.JPATransactionInterceptor.intercept(JPATransactionInterceptor.java:73)
    at br.com.caelum.vraptor.jpa.JPATransactionInterceptor$Proxy$_$$_WeldClientProxy.intercept(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at net.vidageek.mirror.provider.java.PureJavaMethodReflectionProvider.invoke(PureJavaMethodReflectionProvider.java:38)
    at net.vidageek.mirror.invoke.MethodHandlerByMethod.withArgs(MethodHandlerByMethod.java:54)
    at br.com.caelum.vraptor.interceptor.StepInvoker.invokeMethod(StepInvoker.java:63)
    at br.com.caelum.vraptor.interceptor.StepInvoker.tryToInvoke(StepInvoker.java:54)
    at br.com.caelum.vraptor.interceptor.StepInvoker$Proxy$_$$_WeldClientProxy.tryToInvoke(Unknown Source)
    at br.com.caelum.vraptor.interceptor.InterceptorExecutor.executeAround(InterceptorExecutor.java:75)
    at br.com.caelum.vraptor.interceptor.InterceptorExecutor$Proxy$_$$_WeldClientProxy.executeAround(Unknown Source)
    at br.com.caelum.vraptor.interceptor.AspectStyleInterceptorHandler.execute(AspectStyleInterceptorHandler.java:87)
    at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:83)
    at br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor.intercept(ExceptionHandlerInterceptor.java:75)
    at br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor$Proxy$_$$_WeldClientProxy.intercept(Unknown Source)
    at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:58)
    at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:83)
    at br.com.caelum.vraptor.core.DefaultInterceptorStack.start(DefaultInterceptorStack.java:93)
    at br.com.caelum.vraptor.core.DefaultInterceptorStack$Proxy$_$$_WeldClientProxy.start(Unknown Source)
    at br.com.caelum.vraptor.observer.RequestHandlerObserver.handle(RequestHandlerObserver.java:86)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:93)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:266)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:253)
    at org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:232)
    at org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:169)
    at org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:165)
    at org.jboss.weld.event.ObserverNotifier.notifyObservers(ObserverNotifier.java:119)
    at org.jboss.weld.event.ObserverNotifier.fireEvent(ObserverNotifier.java:112)
    at org.jboss.weld.event.EventImpl.fire(EventImpl.java:83)
    at br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:116)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
    at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1517)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1474)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)

vlw pessoal

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