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copied!<p>You can use <code>@JsonIdentityInfo</code> in the two classes <code>User</code> and <code>Event</code> this way:</p> <pre class="lang-java prettyprint-override"><code>import java.util.List; import com.fasterxml.jackson.annotation.JsonIdentityInfo; import com.fasterxml.jackson.annotation.ObjectIdGenerators; @JsonIdentityInfo(generator = ObjectIdGenerators.UUIDGenerator.class, property="@UUID") public class User { private int id; private List<Event> events; // Getters and setters } </code></pre> <p>... and</p> <pre class="lang-java prettyprint-override"><code>import java.util.List; import com.fasterxml.jackson.annotation.JsonIdentityInfo; import com.fasterxml.jackson.annotation.ObjectIdGenerators; @JsonIdentityInfo(generator = ObjectIdGenerators.UUIDGenerator.class, property="@UUID") public class Event { private int id; private List<User> users; // Getters and setters } </code></pre> <p>You can use any of the <code><a href="http://fasterxml.github.io/jackson-annotations/javadoc/2.2.0/com/fasterxml/jackson/annotation/ObjectIdGenerator.html" rel="noreferrer">ObjectIdGenerator</a></code>s as appropriate. Now, serialization and deserialization of the objects that correspond to the many to many mapping will succeed:</p> <pre class="lang-java prettyprint-override"><code>public static void main(String[] args) throws IOException { ObjectMapper objectMapper = new ObjectMapper(); objectMapper.configure(SerializationFeature.INDENT_OUTPUT, true); Event event1 = new Event(); event1.setId(1); Event event2 = new Event(); event2.setId(2); User user = new User(); user.setId(10); event1.setUsers(Arrays.asList(user)); event2.setUsers(Arrays.asList(user)); user.setEvents(Arrays.asList(event1, event2)); String json = objectMapper.writeValueAsString(user); System.out.println(json); User deserializedUser = objectMapper.readValue(json, User.class); System.out.println(deserializedUser); } </code></pre> <p>Hope this helps.</p>

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