java - (De)serialize enum set -

is there easy way serialize , deserialize enum sets jackson?

private enum type {     yes, no }  @jacksonxmlproperty(localname = "type", isattribute = true) private final enumset<type> types; 

this gives following xml:

...<type type="yes" type="no"/>... 

this xml not valid, since there duplicate attribute.

i tried following annotations:

@jsonserialize(using = enumsetserializer.class) @jacksonxmlproperty(localname = "type", isattribute = true) private final enumset<type> mtypes; 

but gives following error:

exception in thread "main" com.fasterxml.jackson.databind.jsonmappingexception: class com.fasterxml.jackson.databind.ser.std.enumsetserializer has no default (no arg) constructor 

in case should write custom enumset serializer/deserializer convert enum set string. here complete example:

@suppresswarnings({"unchecked", "raw"}) public class jacksonenumset {     public enum type {         yes, no     }     public static class bean {         @jacksonxmlelementwrapper(usewrapping = false)         @jacksonxmlproperty(localname = "type", isattribute = true)         @jsonserialize(using = enumsetserializer.class)         @jsondeserialize(using = enumsetdeserializer.class)         private final enumset<type> types;          @jsoncreator         public bean(@jsonproperty("type") final enumset<type> types) {this.types = types;}          public enumset<type> gettypes() {return types;}          @override         public string tostring() {             return "bean{" +                     "types=" + types +                     '}';         }     }      public static class enumsetserializer extends jsonserializer<enumset> {          @override         public void serialize(                 final enumset value,                 final jsongenerator gen,                 final serializerprovider serializers)                 throws ioexception {             final stringbuilder builder = new stringbuilder();             (final object e : value) {                 if (builder.length() > 0) {                     builder.append(";");                 }                 builder.append(e);             }             gen.writestring(builder.tostring());         }     }      public static class enumsetdeserializer extends jsondeserializer<enumset>         implements contextualdeserializer {         private class enumtype;          @override         public enumset deserialize(                 final jsonparser p,                 final deserializationcontext ctxt) throws ioexception {             final string string = p.getvalueasstring();             final enumset enumset = enumset.noneof(enumtype);             (final string name : string.split(";")) {                 enumset.add(enum.valueof(enumtype, name));             }             return enumset;         }          @override         public jsondeserializer<?> createcontextual(                 final deserializationcontext ctxt, final beanproperty property)                 throws jsonmappingexception {             final collectionliketype type = (collectionliketype)property.gettype();             final enumsetdeserializer enumsetdeserializer = new enumsetdeserializer();             enumsetdeserializer.enumtype = type.getcontenttype().getrawclass();             return enumsetdeserializer;         }     }      public static void main(string[] args) throws ioexception {         final xmlmapper mapper = new xmlmapper();         final bean bean = new bean(enumset.allof(type.class));         final string xml = mapper.writevalueasstring(bean);         system.out.println(xml);         system.out.println(mapper.readvalue(xml, bean.class));     }  } 

output:

<bean xmlns="" type="yes;no"></bean> bean{types=[yes, no]}