I am encountering problem while generating mapping file

after all the things while i try to generate hbm file from by just clicking on the right click button on table using hibernate reversing Engneering..... (which is used to sets all the POJO class,DAO class) and also configured all the table and columns with default values and after that i am getting a error called"


an pop up window has come like"the selected packagemight contain files that will be overwritten by articraft generations"
and if select yesss




i get a pop window called AN INTERNAL ERROR OCCURED during"GENERATING ARTICRAFTS"


please solve this..........
and if i try it in the classpath is not at all setting........
how to run a small apllication without using IDE...........
which classpath to be set..........