Ok, I got it. Instead of using transit-clj I can user the java library 
directly. The reader automatically returns ArrayList and HashMap. Great!

On Thursday, August 7, 2014 8:11:50 PM UTC+2, Thomas Heller wrote:
>
> Both Transit and fressian take a Handler map as arguments to the 
> reader/writer functions/constructors. So its pretty straightforward to 
> replace the default handlers with handlers that do what you want. 
>
> I have no example handy but it should be documented in both libraries. 
> Transit has something called mapBuilder, not sure about fressian.
>
> HTH,
> /thomas
>
> On Thursday, August 7, 2014 2:48:20 PM UTC+2, Islon Scherer wrote:
>>
>> Hi,
>>
>> I have a program I wrote who needs to serialize java HashMaps and 
>> ArrayLists to and from disk but AFAIK (and after some simple tests) it 
>> seems fressian writes those maps/lists correctly but read them back as 
>> clojure maps and lists (persistent).
>> Is there a way to tell fressian (could be transit too) to read them back 
>> as java maps/lists?
>> Just for some context, it's a huge amount of data and it should be 
>> serialized in binary format/non-human readable way for performance and 
>> space considerations. All the data is composed of simple types (maps, 
>> lists, strings, numbers, keywords only. No complex objects)
>> I'm thinking about maybe just using some java serialization library if 
>> fressian/transit doesn't support that.
>>
>> Thanks in advance.
>>
>

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