{"action":"created","issue":{"url":"https://api.github.com/repos/json4s/json4s/issues/83","labels_url":"https://api.github.com/repos/json4s/json4s/issues/83/labels{/name}","comments_url":"https://api.github.com/repos/json4s/json4s/issues/83/comments","events_url":"https://api.github.com/repos/json4s/json4s/issues/83/events","html_url":"https://github.com/json4s/json4s/issues/83","id":24055603,"number":83,"title":"Mapping exception","user":{"login":"Fuzion24","id":772364,"avatar_url":"https://avatars.githubusercontent.com/u/772364?v=3","gravatar_id":"","url":"https://api.github.com/users/Fuzion24","html_url":"https://github.com/Fuzion24","followers_url":"https://api.github.com/users/Fuzion24/followers","following_url":"https://api.github.com/users/Fuzion24/following{/other_user}","gists_url":"https://api.github.com/users/Fuzion24/gists{/gist_id}","starred_url":"https://api.github.com/users/Fuzion24/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Fuzion24/subscriptions","organizations_url":"https://api.github.com/users/Fuzion24/orgs","repos_url":"https://api.github.com/users/Fuzion24/repos","events_url":"https://api.github.com/users/Fuzion24/events{/privacy}","received_events_url":"https://api.github.com/users/Fuzion24/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":5,"created_at":"2013-12-10T18:32:04Z","updated_at":"2015-02-25T10:18:22Z","closed_at":null,"body":"I am using version 3.2.6 and scala 2.10.3..\r\nThis does not occur on older versions of json4s\r\n```\r\norg.json4s.package$MappingException: Can't find ScalaSig for class java.lang.Object\r\n\tat org.json4s.reflect.ScalaSigReader$.findClass(ScalaSigReader.scala:42)\r\n\tat org.json4s.reflect.ScalaSigReader$.org$json4s$reflect$ScalaSigReader$$read$1(ScalaSigReader.scala:36)\r\n\tat org.json4s.reflect.ScalaSigReader$.org$json4s$reflect$ScalaSigReader$$read$1(ScalaSigReader.scala:36)\r\n\tat org.json4s.reflect.ScalaSigReader$.readField(ScalaSigReader.scala:38)\r\n\tat org.json4s.reflect.Reflector$ClassDescriptorBuilder$$anonfun$3.apply(Reflector.scala:66)\r\n\tat org.json4s.reflect.Reflector$ClassDescriptorBuilder$$anonfun$3.apply(Reflector.scala:65)\r\n\tat scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)\r\n\tat scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)\r\n\tat scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)\r\n\tat scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)\r\n\tat scala.collection.TraversableLike$class.map(TraversableLike.scala:244)\r\n\tat scala.collection.AbstractTraversable.map(Traversable.scala:105)\r\n\tat org.json4s.reflect.Reflector$ClassDescriptorBuilder.fields(Reflector.scala:65)\r\n\tat org.json4s.reflect.Reflector$ClassDescriptorBuilder.properties(Reflector.scala:82)\r\n\tat org.json4s.reflect.Reflector$ClassDescriptorBuilder.result(Reflector.scala:159)\r\n\tat org.json4s.reflect.Reflector$.createDescriptor(Reflector.scala:50)\r\n\tat org.json4s.reflect.Reflector$$anonfun$describe$1.apply(Reflector.scala:44)\r\n\tat org.json4s.reflect.Reflector$$anonfun$describe$1.apply(Reflector.scala:44)\r\n\tat org.json4s.reflect.package$Memo.apply(package.scala:39)\r\n\tat org.json4s.reflect.Reflector$.describe(Reflector.scala:44)\r\n\tat org.json4s.Extraction$.internalDecomposeWithBuilder(Extraction.scala:140)\r\n\tat org.json4s.Extraction$.internalDecomposeWithBuilder(Extraction.scala:114)\r\n\tat org.json4s.Extraction$.decomposeWithBuilder(Extraction.scala:67)\r\n\tat org.json4s.native.Serialization$.write(Serialization.scala:44)\r\n\tat org.json4s.native.Serialization$.write(Serialization.scala:38)\r\n```"},"comment":{"url":"https://api.github.com/repos/json4s/json4s/issues/comments/75936514","html_url":"https://github.com/json4s/json4s/issues/83#issuecomment-75936514","issue_url":"https://api.github.com/repos/json4s/json4s/issues/83","id":75936514,"user":{"login":"raimohanska","id":292964,"avatar_url":"https://avatars.githubusercontent.com/u/292964?v=3","gravatar_id":"","url":"https://api.github.com/users/raimohanska","html_url":"https://github.com/raimohanska","followers_url":"https://api.github.com/users/raimohanska/followers","following_url":"https://api.github.com/users/raimohanska/following{/other_user}","gists_url":"https://api.github.com/users/raimohanska/gists{/gist_id}","starred_url":"https://api.github.com/users/raimohanska/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/raimohanska/subscriptions","organizations_url":"https://api.github.com/users/raimohanska/orgs","repos_url":"https://api.github.com/users/raimohanska/repos","events_url":"https://api.github.com/users/raimohanska/events{/privacy}","received_events_url":"https://api.github.com/users/raimohanska/received_events","type":"User","site_admin":false},"created_at":"2015-02-25T10:18:22Z","updated_at":"2015-02-25T10:18:22Z","body":"Oh, in fact there was more info in the log:\r\n\r\norg.json4s.package$MappingException: No usable value for kieli\r\n25-Feb-2015 10:33:27\tNo usable value for $outer\r\n25-Feb-2015 10:33:27\tCan't find ScalaSig for class java.lang.Object\r\n\r\nTurned out to be a serialization problem with Enums in case the input value was not a valid enum value. We are using EnumNameSerializer here. I think the error message could be better of course."}}