in jackson2/src/java/org/apache/fulcrum/json/jackson/Jackson2MapperService.java [176:184]
public <T> T deSer(String json, Class<T> type) throws Exception {
ObjectReader reader = null;
if (type != null)
reader = mapper.readerFor(type);
else
reader = mapper.reader();
return reader.readValue(json);
}