An exception of this type indicates that a credential (such as a Kerberos ticket) necessary for login could not be found. This is not the same as presenting an invalid credential, which results in a FailedLoginException.

Figure 19-25. javax.security.auth.login.CredentialNotFoundException

public class CredentialNotFoundException extends CredentialException {
// Public Constructors
     public CredentialNotFoundException( );  
     public CredentialNotFoundException(String msg);  
}