@Override
	public void validate() {
		super.validate();
		if (SUBMIT.equals(getSubmit())) {
			if (StringUtils.isBlank(issueBookVO.getStudentID())
					//|| !(StringUtils.isAlphanumeric(issueBookVO.getStudentID()))
			) {
				addFieldError("issueBookVO.studentID", "Enter valid student ID");
			}

			if (StringUtils.isBlank(issueBookVO.getBookID())
					|| !(StringUtils.isAlphanumeric(issueBookVO.getBookID()))) {
				addFieldError("issueBookVO.bookID", "Enter valid book ID");
			}

			if (StringUtils.isBlank(getAction())) {
				addFieldError("action", "Please select Option");
			}
		}
	}