java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer in java 1.6

Use:

((Long) userService.getAttendanceList(currentUser)).intValue();

instead.

The .intValue() method is defined in class Number, which Long extends.

The number of results can (theoretically) be greater than the range of an integer. I would refactor the code and work with the returned long value instead.