Tested with following environment:
* Product Version: NetBeans IDE Dev (Build 200807101204)
* Java: 1.6.0_10-beta; Java HotSpot(TM) Client VM 11.0-b11
* System: Linux version 2.6.24-19-generic running on i386; UTF-8; en_US (nb)
* Userdir: /home/josin/.netbeans/dev

There are components with potential mnemonics conflict with mnemonic 'S': "Select..." button and "Skip" button.
Hereafter there are components with mnemonic 'C': "Close" button and "Code:" label.

Full output from accessibility tester:
=========================================== 
Tested Window title : Internationalize 
===========================================

Doesn't implement Accessible : - none.

No Accessible name : - none.

No Accessible description : - none.

Label with LABEL_FOR not set : - none.

Components with no LABEL_FOR pointing to it : - none.

Components with no mnemonic : - none.

Components with wrong mnemonic (mnemonic isn't ASCII , label doesn't contain mnemonic): - none.

Components with potential mnemonics conflict: - components with mnemonic 'S' :

Class
    javax.swing.JButton { Select... | N/A } 
Class
    javax.swing.JButton { Skip | N/A } 

- components with mnemonic 'C' :

Class
    javax.swing.JButton { Close | N/A } 
Class
    javax.swing.JLabel { Code: | } 

Components not reachable with tab traversal : - none.