Problem adding ArrayList to List

[Tom Henricksen]

This method is throwing an java.lang.UnsupportedOperationException
when I unit test it. It comes from the line with the list.add(inList);

 
public long createRecord(String[] data) throws DuplicateKeyException {
List list = Arrays.asList(this.data);
ArrayList inList = new ArrayList();
for (int i = 0; i < data.length; i++) {
inList.add(data[i]);
}
inList.add((new String(new Integer(recNo).toString())));
list.add(inList);  // THis is the problem
this.data = (String[][]) list.toArray(new String[list.size()][]);
int createdRecNo = recNo;
recNo++;
return createdRecNo;
 
}

Any suggestions?
Thanks,
Tom
[ September 20, 2005: Message edited by: Tom Henricksen ]

[Henry Wong]

The Arrays.asList() does not return a fully functional list... Quoted from the Java Docs...

Returns a fixed-size list backed by the specified array.

Since the list that is return is backed by the specified array, it can't change in size. This means add and remove operations do not work.

Henry

[Layne Lund]

One possible way to fix this is with the following:

List list = new ArrayList(Arrays.asList(this.data));

This will create a new List that you CAN modify. It also adds all the elements from the List that is created by the asList() method.

HTH

Layne