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Redirecionar pagina no controller Vraptor

Galera eu estou usando o vraptor ,quero autenticar o usuario e redirecionar ele para a pagina de listagem ou então deixar na mesma (caso falhe)

Metodo no controller


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


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


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

Erro:


set 21, 2015 3:17:47 PM 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 call sendRedirect() after the response has been committed
    at org.apache.catalina.connector.ResponseFacade.sendRedirect(ResponseFacade.java:494)
    at javax.servlet.http.HttpServletResponseWrapper.sendRedirect(HttpServletResponseWrapper.java:138)
    at br.com.caelum.vraptor.http.VRaptorResponse.sendRedirect(VRaptorResponse.java:48)
    at br.com.caelum.vraptor.view.DefaultLogicResult$2.intercept(DefaultLogicResult.java:151)
    at br.com.caelum.vraptor.proxy.JavassistProxifier$MethodInvocationAdapter.invoke(JavassistProxifier.java:106)
    at br.com.save.controller.IndexController_$$_jvstb9_5.autentica(IndexController_$$_jvstb9_5.java)
    at br.com.save.controller.IndexController.logar(IndexController.java:39)
    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)

se alguem souber algum modo pratica e simples de fazer isso por favor . . abraços!

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