//Clone from "shared" ObjectMapper
mapper = mapper.copy();
mapper.addMixInAnnotations(Object.class, PortletRenderExecutionEventFilterMixIn.class);
final FilterProvider filterProvider = new SimpleFilterProvider().addFilter(PortletRenderExecutionEventFilterMixIn.FILTER_NAME, SimpleBeanPropertyFilter.filterOutAllExcept("fname", "executionTimeNano", "parameters"));
final ObjectWriter portletEventWriter = mapper.writer(filterProvider);
final String result = portletEventWriter.writeValueAsString(createEvent());
assertEquals("{\"@c\":\".PortletRenderExecutionEvent\",\"fname\":\"fname1\",\"executionTimeNano\":123450000,\"parameters\":{}}", result);
}