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diff --git a/security/runtime/org.argeo.security.core/src/main/java/org/argeo/security/json/ArgeoUserMapper.java b/security/runtime/org.argeo.security.core/src/main/java/org/argeo/security/json/ArgeoUserMapper.java
new file mode 100644
index 000000000..55e22b711
--- /dev/null
+++ b/security/runtime/org.argeo.security.core/src/main/java/org/argeo/security/json/ArgeoUserMapper.java
@@ -0,0 +1,84 @@
+package org.argeo.security.json;
+
+import java.io.IOException;
+import java.io.StringWriter;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.argeo.security.ArgeoUser;
+import org.argeo.security.BasicArgeoUser;
+import org.argeo.security.UserNature;
+import org.codehaus.jackson.JsonFactory;
+import org.codehaus.jackson.JsonGenerator;
+import org.codehaus.jackson.JsonNode;
+import org.codehaus.jackson.JsonParseException;
+import org.codehaus.jackson.JsonParser;
+import org.codehaus.jackson.JsonProcessingException;
+import org.codehaus.jackson.map.DeserializationContext;
+import org.codehaus.jackson.map.JsonDeserializer;
+import org.codehaus.jackson.map.JsonMappingException;
+import org.codehaus.jackson.map.ObjectMapper;
+import org.codehaus.jackson.map.deser.CustomDeserializerFactory;
+import org.codehaus.jackson.map.deser.StdDeserializerProvider;
+
+public class ArgeoUserMapper {
+	private final static Log log = LogFactory.getLog(ArgeoUserMapper.class);
+
+	private String userNatureTypeField = "type";
+
+	private ObjectMapper mapper = new ObjectMapper();
+
+	public ArgeoUserMapper() {
+		CustomDeserializerFactory dsf = new CustomDeserializerFactory();
+		dsf.addSpecificMapping(UserNature.class, new UserNatureDeserializer());
+		StdDeserializerProvider sdp = new StdDeserializerProvider(dsf);
+		mapper.setDeserializerProvider(sdp);
+	}
+
+	public ArgeoUser parse(String content) throws JsonMappingException,
+			JsonParseException, IOException {
+
+		return mapper.readValue(content, BasicArgeoUser.class);
+	}
+
+	private class UserNatureDeserializer extends JsonDeserializer<UserNature> {
+		private JsonFactory jsonFactory = new JsonFactory();
+
+		@Override
+		public UserNature deserialize(JsonParser parser,
+				DeserializationContext dc) throws IOException,
+				JsonProcessingException {
+			try {
+				// first read as Json DOM in order to extract the type
+				// TODO: optimize with streaming API
+				JsonNode root = parser.readValueAsTree();
+				String type = root.get(userNatureTypeField).getTextValue();
+
+				// Write it back as a string
+				StringWriter writer = new StringWriter();
+				JsonGenerator generator = jsonFactory
+						.createJsonGenerator(writer);
+				generator.setCodec(mapper);
+				generator.writeTree(root);
+				String str = writer.toString();
+
+				log.info("type=" + type + ", str=" + str);
+
+				// TODO: use context classloader (in OSGi)
+				// TODO: externalize type/classes mapping
+				Class<UserNature> clss = (Class<UserNature>) Class
+						.forName(type);
+				UserNature result = mapper.readValue(str, clss);
+
+				// JavaType javaType = TypeFactory.fromClass(clss);
+				// BeanDeserializer bd = new BeanDeserializer(javaType);
+				// JsonParser parser2 = jsonFactory.createJsonParser(str);
+
+				return result;
+			} catch (ClassNotFoundException e) {
+				throw new RuntimeException("Cannot deserialize", e);
+			}
+		}
+
+	}
+}