Запросить всю коллекцию в джонго

Я пытаюсь получить все результаты из этой коллекции, и они пытаются напечатать первый:

MongoCollection musics = JNDIManager.getJongoCollection("musics");
Iterable<MusicObject> all = musics.find().as(MusicObject.class);

где класс MusicObject:

public class MusicObject {
    @Id
    private final String _id; // refers to directory
    private String name;
    private String directory;

    MusicObject() {};
}

и db.musics.find() приводит к

{"_id": ObjectId("..."), "name": " Certain Name", "directory" : "C:\\..."}
{"_id": ObjectId("..."), "name": " Certain Name 2", "directory" : "C:\\..."}
{"_id": ObjectId("..."), "name": " Certain Name 3", "directory" : "C:\\..."}

с полной трассировкой стека исключений

org.jongo.marshall.MarshallingException: Unable to unmarshall result to class br.com.evans.dao.musics.MusicObject from content {"_id": ObjectId("..."), "name": " Certain Name", "directory" : "C:\\..."}
at org.jongo.marshall.jackson.JacksonEngine.unmarshall(JacksonEngine.java:45)
at org.jongo.ResultHandlerFactory$ResultUnmarshallingHandler.map(ResultHandlerFactory.java:43)
at org.jongo.MongoIterator.next(MongoIterator.java:44)
at br.com.evans.jdni.music.MusicPlayer.setMusicListFromDB(MusicPlayer.java:52)
at br.com.evans.command.repository.CommandRepository.proccesNode(CommandRepository.java:47)
at br.com.evans.behavior.nodes.core.MusicBehavior.execute(MusicBehavior.java:40)
at br.com.evans.servlets.behavior.BehaviorExecution.doPost(BehaviorExecution.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at br.com.evans.servlet.filters.SessionFilter.doFilter(SessionFilter.java:55)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.io.CharConversionException: Invalid UTF-32 character 0x64695f07(above 10ffff)  at char #1, byte #7)
at com.fasterxml.jackson.core.io.UTF32Reader.reportInvalid(UTF32Reader.java:155)
at com.fasterxml.jackson.core.io.UTF32Reader.read(UTF32Reader.java:109)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.loadMore(ReaderBasedJsonParser.java:122)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._skipWSOrEnd(ReaderBasedJsonParser.java:1651)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:552)
at com.fasterxml.jackson.databind.ObjectReader._initForReading(ObjectReader.java:1293)
at com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:1199)
at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:862)
at org.jongo.marshall.jackson.JacksonEngine.unmarshall(JacksonEngine.java:42)
... 27 more

Как это исправить? Я просмотрел документацию по джонго и понял, что неправильно сопоставляю свой MusicObject, просто не знаю, что мне делать. Пробовал @Id, длинный, String, @ObjectId

Изменить: также удален уникальный индекс, который был в столбце каталога.