when I use the HSSFRegionUtil,the program output a error!

[jinxianhe]

When I read quick-guide (hssf),

With Using the Convenience Functions,the sample code:

The Jbuilder9 error :

"Report.java": cannot access
org.apache.commons.lang.exception.NestableException,org.apache.commons.lang.
exception.NestableException at line 494, column 24


I can’t find org.apache.commons.lang.exception.NestableException


Whey？