Question

I want my request parameter map in my custom map like

Map<String, String> reqMap =(HashMap<String, String>)request.getParameterMap();

Above statement gives me following exception

java.lang.ClassCastException: java.util.Collections$UnmodifiableMap

Can any one guide me how can I get all request parameters in my custom map?
Don’t want to write for loop to get parameters one by one which cause me performance issue.

Answer 1

Map<String, String> reqMap = request.getParameterMap();
CustomMap<String, String> customMap = new CustomMap<String,String>();
customMap.putAll(reqMap);

Of course, you may need to iterate through the map elements in your putAll() implementation. Otherwise it is not possible.

UPDATE:
Just saw your comment, Thai is easy then,

Map<String, String> reqMap = request.getParameterMap();
Map<String, String> newMap= new HashMap<String,String>();
newMap.putAll(reqMap);

or, you can even pass the reqMap as a constructor argument to new HashMap<String, String>(reqMap);