Program: 101902
Project: 101902
Buggy source:
@Override public Document<T> mapping(final Class<? extends T> aType){
  if (document != null)   throw new IllegalStateException("String_Node_Str");
  return document=new Document<T>(){
    private Class<?> intermediate;
    private List<Content<?>> content=NO_CONTENT;
    private Converter<Object,T> converter;
    private ReflectorFactory reflector=new ReflectorFactory();
    private Class<? extends T> type=reflector.getProxy(aType);
    @Override public Document<T> with(    Content<?>... aContent){
      content=new ArrayList<Content<?>>();
      for (      Content<?> _c : aContent) {
        _c.onAttach(type,reflector,JsonDocumentDefinition.this);
        content.add(_c);
      }
      return this;
    }
    @Override public <I>Document<I> via(    Class<I> anIntermediateType){
      intermediate=reflector.getProxy(anIntermediateType);
      converter=(Converter<Object,T>)getConverter(anIntermediateType,type);
      return (Document<I>)this;
    }
    @Override public <I>Document<I> via(    Class<I> anIntermediateType,    Converter<I,? extends T> aConverter){
      intermediate=reflector.getProxy(anIntermediateType);
      converter=(Converter<Object,T>)aConverter;
      return (Document<I>)this;
    }
    @Override @SuppressWarnings("String_Node_Str") public Builder<T> newBuilder(){
      List<Builder<?>> _nested=new ArrayList<Builder<?>>();
      for (      Content<?> _c : content)       _nested.add(_c.newBuilder());
      return new ReflectiveBuilder(Name.MISSING,aType,intermediate,converter,reflector.newReflector(),_nested);
    }
  }
;
}

Fixed version (ground truth):
@Override public Document<T> mapping(final Class<? extends T> aType){
  if (document != null)   throw new IllegalStateException("String_Node_Str");
  return document=new Document<T>(){
    private Class<?> intermediate;
    private List<Content<?>> content=NO_CONTENT;
    private Converter<Object,T> converter;
    private ReflectorFactory reflector=new ReflectorFactory();
    private Class<? extends T> type=ReflectorFactory.maybeConvertToProxy(aType);
    @Override public Document<T> with(    Content<?>... aContent){
      content=new ArrayList<Content<?>>();
      for (      Content<?> _c : aContent) {
        _c.onAttach(type,reflector,JsonDocumentDefinition.this);
        content.add(_c);
      }
      return this;
    }
    @Override public <I>Document<I> via(    Class<I> anIntermediateType){
      intermediate=ReflectorFactory.maybeConvertToProxy(anIntermediateType);
      converter=(Converter<Object,T>)getConverter(anIntermediateType,type);
      return (Document<I>)this;
    }
    @Override public <I>Document<I> via(    Class<I> anIntermediateType,    Converter<I,? extends T> aConverter){
      intermediate=ReflectorFactory.maybeConvertToProxy(anIntermediateType);
      converter=(Converter<Object,T>)aConverter;
      return (Document<I>)this;
    }
    @Override @SuppressWarnings("String_Node_Str") public Builder<T> newBuilder(){
      List<Builder<?>> _nested=new ArrayList<Builder<?>>();
      for (      Content<?> _c : content)       _nested.add(_c.newBuilder());
      return new ReflectiveBuilder(Name.MISSING,aType,intermediate,converter,reflector.newReflector(),_nested,false);
    }
  }
;
}