Java Programming

Hello,

I'm experiencing the strangest exception with an ArrayList. Here's the stack trace (partial):

java.lang.IndexOutOfBoundsException: Index: 0, Size: 18
at java.util.ArrayList.RangeCheck(ArrayList.java:547)
at java.util.ArrayList.get(ArrayList.java:322)
at prefuse.data.CascadedTable.getColumn(CascadedTable.java:442)
at prefuse.data.Table.getLong(Table.java:1097)
at prefuse.data.Graph.getSourceNode(Graph.java:887)
at prefuse.data.Graph.getAdjacentNode(Graph.java:929)
at prefuse.data.Graph.getAdjacentNode(Graph.java:953)

Notice the values of "index" and "size" in the message. Here's the source from ArrayList:

private void RangeCheck(int index) {
	if (index >= size)
	    throw new IndexOutOfBoundsException(
		"Index: "+index+", Size: "+size);
    }

Clearly, 0 < 18 (index < size), so, how in the heck am I getting this exception? Any ideas?

Thanks for any thoughts,

Chris