[{"estado"  :"error","origen"  :"PortalWeb","codigo"  :"rimac.portalweb.controller.LoginController.logout","mensaje" :"java.lang.NullPointerException<-> at java.io.StringReader.<init>(StringReader.java:50)<-> at org.codehaus.jackson.JsonFactory.createJsonParser(JsonFactory.java:427)<-> at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1271)<-> at rimac.portalweb.controller.LoginController.logout(LoginController.java:349)<-> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<-> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)<-> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)<-> at java.lang.reflect.Method.invoke(Method.java:498)<-> "}]