It's much better to re-use a single ObjectMapper instance, or a small set of differently configured ObjectMapper instances.
Here's an example of using dependency injection to provide a single ObjectMapper that is then re-used by JacksonRepresentations created by a JSON converter: https://github.com/Tembrel/restlet-misc/blob/master/src/main/java/net/peierls/restlet/misc/LocalJacksonConverter.java You can use the same approach in your resources by injecting a singleton ObjectMapper into your resources (see, for example, http://tembrel.blogspot.com/2012/03/restlet-guice-extension-considered.html) and using a custom extension of JacksonRepresentation that uses that ObjectMapper. Note that I'm using Jackson 2.x with a Restlet Jackson extension that works with Jackson 1.9, which is why my extension of JacksonRepresentation doesn't simply override createObjectMapper(). ------------------------------------------------------ http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447&dsMessageId=3044414
