anybody has some voldemort examples

Question

examples of persisting java objects in voldemort.as well as configuration.

I am curious why online examples are few. thanks

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moved and formated from a comment by the OP:

e.x I want to persist a jpg file in my web service. here is my code

File img = new File("a.jpg"); 
DataSource ds = new FileDataSource(img);  
DataHandler dh = new DataHandler(ds);  
ByteArrayOutputStream s = new ByteArrayOutputStream(100000);  
try{ 
   dh.writeTo(s); 
} 
catch(IOException ioe){  
   ioe.printStackTrace(); 
}  
StoreClient<String, ByteArrayOutputStream> client = factory.getStoreClient("test"); 
client.put("key", s); 

ByteArrayOutputStream cannot be cast to java.lang.String can anybody tell me why? I edit my stores.xml file