This one[1] from .Net comes quite close. Though, it was almost decade ago, they might have passed Java on class name length by now.
[1]http://weblogs.asp.net/rchartier/archive/2004/02/05/68350.as...
[1]http://weblogs.asp.net/rchartier/archive/2004/02/05/68350.as...
Interesting. It's long, but it's also pretty clear on what it does, and doesn't have any repeated words.
Reading this, I would guess that it's a notification of when the user starts editing a column, and indeed that's what it does. "Informs the System.Windows.Forms.DataGrid that the user has begun editing the column." is the official description in the API.
Anyways, we are shaming Java here because of one obviously automatically generated internal class.