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• i was facing the same problem,"UnsupportedOperationException while removing or adding elements from List."
  what i did was took the arrays.aslist result in new Arraylist and used addAll method to add in it..then we can perform the add/remove from newly created and populated list.

  //Customer_Orders was converted to list by using Arrays.aslist
  //was giving exception on remove

  (Arrays.asList(customer_Orders)

  //what i did was

  List list1= new ArrayList();
  list1.addAll(Arrays.asList(customer_Orders)) ;

  //perform operation on list1
  list1.remove(j);

• Thanks, this surly helped me.

• What do you mean by "By the time you get to the remove(i) statement, list is no longer a java.util.ArrayList."?
  A. It crashes before that line
  B. list was never a java.util.ArrayList

• More easy solution is to replace :
  List myNewList = Array.asList(someArrayOfLong);
  by :
  List myNewList = new ArrayList(Array.asList(someArrayOfLong));
  I think it resoled the problem

• Thank you so muck your post is resolved my problem

• i'm getting some exception when doing add operation on Collections.unmodifiableList like unsupported operation.can you pls provide a solution for this?

• Collections.unmodifiableList(new ArrayList(map.values()))
  getting unsupportedException
  pls help

• Thank You So much for the solution