how to change user password　

I try to change password of exist user .

but it is occurred exception. ( Your password must be at least 8 characters long. )

I want to ignore the password Rule using my JSP Service.

Can any one help me on this?

My code (Change password):

boObjects = boStore.query("SELECT SI_ID From CI_SYSTEMOBJECTS Where SI_PROGID='CrystalEnterprise.User' and SI_NAME = '" + userId + "'");

boUser = (IUser)boObjects.get(0);

boUser.setNewPassword(userPasswd );

boStore.commit(boObjects); //-> Exception occurred.

Additional Information:

Version : XI4.0

Environment : Windows2008 Enterprise R2

                       Tomcat 6 (included in BusinessObjects CD)

I can create new user with short password using my JSP Service (Create new user).

Why does this happen only when the Password change?

code (Create new user) :

boPluginMgr = boStore.getPluginMgr();

boUserPlugin = boPluginMgr.getPluginInfo("CrystalEnterprise.User");

boObjects = boStore.newInfoObjectCollection();

boNewUser = boObjects.add(boUserPlugin);

boUser = (IUser)boNewUser;

boUser.setNewPassword(userPasswd );

boStore.commit(boObjects);