Problema com angular js + vraptor

Pessoal,

Estou tentando mandar um post simples de um uma pagina jsp para minha controller e tomo o seguinte erro:

05:37:32,100 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/gmud]] (http-localhost-127.0.0.1-8080-1) Unhandled exception occurred whilst decorating page: com.thoughtworks.xstream.converters.ConversionException: null : null
---- Debugging information ----
cause-exception     : java.lang.NullPointerException
cause-message       : null
class               : br.com.jfive.gmud.models.Usuario
required-type       : br.com.jfive.gmud.models.Usuario
converter-type      : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
line number         : -1
version             : null
-------------------------------
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79) [xstream-1.4.1.jar:]
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) [xstream-1.4.1.jar:]
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50) [xstream-1.4.1.jar:]
	at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134) [xstream-1.4.1.jar:]
	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32) [xstream-1.4.1.jar:]
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1035) [xstream-1.4.1.jar:]
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1019) [xstream-1.4.1.jar:]
	at com.thoughtworks.xstream.XStream.fromXML(XStream.java:904) [xstream-1.4.1.jar:]
	at br.com.caelum.vraptor.deserialization.JsonDeserializer.deserialize(JsonDeserializer.java:62) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.interceptor.DeserializingInterceptor.intercept(DeserializingInterceptor.java:87) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:59) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.interceptor.ParametersInstantiatorInterceptor.intercept(ParametersInstantiatorInterceptor.java:93) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:59) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54) [vraptor-3.4.1.jar:]
	at br.com.jfive.gmud.interceptors.MenuInterceptor.intercept(MenuInterceptor.java:37) [classes:]
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.simplemail.AsyncMailerFlushInterceptor.intercept(AsyncMailerFlushInterceptor.java:34) [vraptor-simplemail-1.2.3.jar:]
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.environment.EnvironmentInterceptor.intercept(EnvironmentInterceptor.java:37) [vraptor-environment-1.1.1.jar:]
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:83) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:56) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor.intercept(ExceptionHandlerInterceptor.java:71) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.interceptor.InstantiateInterceptor.intercept(InstantiateInterceptor.java:48) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.interceptor.ResourceLookupInterceptor.intercept(ResourceLookupInterceptor.java:69) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.core.EnhancedRequestExecution.execute(EnhancedRequestExecution.java:44) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.VRaptor$1.insideRequest(VRaptor.java:91) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.ioc.spring.SpringProvider.provideForRequest(SpringProvider.java:58) [vraptor-3.4.1.jar:]
	at br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:88) [vraptor-3.4.1.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
	at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129) [sitemesh-2.4.2.jar:]
	at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77) [sitemesh-2.4.2.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:397) [jbossweb-7.0.13.Final.jar:]
	at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) [jboss-as-jpa-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153) [jboss-as-web-7.1.1.Final.jar:7.1.1.Final]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.13.Final.jar:]
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.13.Final.jar:]
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.13.Final.jar:]
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.13.Final.jar:]
	at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_10]
Caused by: java.lang.NullPointerException
	at br.com.caelum.vraptor.serialization.xstream.VRaptorClassMapper.shouldSerializeMember(VRaptorClassMapper.java:55) [vraptor-3.4.1.jar:]
	at com.thoughtworks.xstream.mapper.MapperWrapper.shouldSerializeMember(MapperWrapper.java:74) [xstream-1.4.1.jar:]
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:297) [xstream-1.4.1.jar:]
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:230) [xstream-1.4.1.jar:]
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) [xstream-1.4.1.jar:]
	... 60 more

Alguem teria uma luz ??? estou ficando doido já rs

[code]
function userController($scope, $window, $http) {

$scope.sendEmail = function () {

    var user = angular.toJson({usuario : $scope.usuario});
    $http.post('/gmud/login/enviaSenha', user).success(function(data){
        $('#errorMessage').html("");
        $('#errorMessage').append("<div class='alert alert-success'>" + data +"</div>");
    });
};

}[/code]

 @Post("/login/enviaSenha")
    @Consumes("application/json")
    public void enviarEmailRecuperacao(Usuario usuario) {

meu json ta mandando assim:

{"usuario":{"email":"fsdfsf"}}

Vlw galera absss

Tenta usar a versão mais nova do VRaptor. Se eu não me engano esse erro foi corrigido no 3.5