Logon failure after upgrade Windows 2003 domain functional level and schema

Before upgrade:

Windows 2003 Std server: Domain functional level 2000, Schema verion 30

Crystal Report XI R2: Authentication: Windows AD

Logon OK.

After Upgrade:

Windows 2003 Std + Windows 2008: Domain functional level 2003, Schema verion 44

Crystal Report XI R2: Authentication: Windows AD

Logon Error: An error has occurred: java.lan.NullPointerException

Is it a Tomcat problem? OR Java runtime problem? OR XI R2 problem?

Anyone can help to fix it!? Thanks!!