public String getJavaFullName()
    {
        StringBuilder buffer = new StringBuilder();
        if (isNested())
            buffer.append(parentMessage.getJavaFullName()).append('.').append(name);
        else
            buffer.append(getProto().getJavaPackageName()).append('.').append(name);
        return buffer.toString();
    }
Disabled by default (the earlier protoc 2.x versions enabled this by default, but was changed later on).
protostuff-parser/src/main/java/io/protostuff/parser/EnumGroup.java