How do I convert List<List<Object>> to a multi-dimensional array?

List<List<Object>> EventAll = new ArrayList<List<Object>>();

    List<Object> row = new ArrayList<Object>();
    /*EventAll.add(rs1.getRow(), row);*/

String[][] stringArray = EventAll.toArray(new String[EventAll.size()][]);//line 66

In the above example as you can see I have List<List<Object>> and I am adding column values to it in the while loop. It worked fine for me at this point.

But when I tried converting it into multi-dimensional array using toArray() method I am getting the following exception:

    at java.lang.System.arraycopy(Native Method)
    at java.util.ArrayList.toArray(Unknown Source)
    at DataFromMySql.main(**
Object[][] array = new Object[EventAll.size()][];

int i = 0;
for (List<Object> event : EventAll) {//each list
    array[i++] = event.toArray(new Object[event.size()]);

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