json map to string failure in java -

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In Java, I am trying to convert a map into a json string. Using the code given below throws IOException 

  Send a private zeroSessions (map & lt; string, string & gt; feedback map) to IOException {PrintStream ps = new PrintStream (clientSocket.getOutputStream ()); JSONObject json = New JSONObject (responseMap); Ps.println (json.toString ()); }   
 Variable  
  JS value result {"empty": wrong} added valid key values ​​to the map   
 There are such values ​​in the map  
  responseMap.put ("response", "right"); ResponseMap.put ("versionname", "Dummy"); ResponseMap.put ("versioncode", "Dummy"); ResponseMap.put ("package", "dummy"); ResponseMap.put ("deviceid", "unknown"); ResponseMap.put ("devicename", "dummy"); ResponseMap.put ("Synchronization", blank); ResponseMap.put ("Additional", "");   
 The code I am using  
 Why is it not by any idea?   
 
 
 Map to Jason, Jason to map? I do not have any problem using  Gson  lib.  
 Map for Jason String  
  GSOnGSN = New GSN Builder (). SetPrettyPrinting () Create (); Maps & lt; String, string & gt; Map = new hashmap & lt; String, string & gt; (); Map.put ("111", "AAAAAAA"); Map.put ("222", "BBBBB"); String Map String = gson.toJson (map); Println (mapString);    
 output  
  {"222": "BBBBB", "111": "AAAAAA"}   
 Jason String Map  
  GSON GSN = New GSOnBiller (). Satty Printing () Create (); String mapstrings = "{\" 222 \ ": \" BBBBB \ ", \" 111 \ ": \" AAAAAAA \ "}"; Maps & lt; String, string & gt; Map = gson.fromJson (map string, map.clash); Println (map.get ("111"));   
 Output  
  AAAAA

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