Object[] cannot not be converted to String[] in jsp

<%
    ArrayList aList=(ArrayList)request.getAttribute("read");
    String[] write =aList.toArray(new String[aList.size()]);
%>

in above code, i am getting

incompatible types: Object[] cannot be converted to String[].

if i cast only i will get the answer what i wish, i google and got lot of solution, but nothing gave me a solution, help me to find out of this problem. thanks in advance for your replies.

Jon Skeet
people
quotationmark

The problem is that the type of aList is the raw type ArrayList. That means all trace of generics is removed from it - even from the generic method toList.

It's simple to fix though - just use ArrayList<?> instead:

ArrayList<?> aList = (ArrayList<?>)request.getAttribute("read");

Raw types are a pain in the neck in general, and were really only included for backward compatibility - try to avoid them where possible.

people

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