제목이랑 콘텐츠 입력해도 '입력 안된 사항 있다고 뜹니다'

혹시 봐주실 수 있으신가요? 저는 아무래도 모르겠습니다ㅜㅜ

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ page import="bbs.BbsDAO" %>
<%@ page import="java.io.PrintWriter" %>
<% request.setCharacterEncoding("UTF-8"); %>
<jsp:useBean id="bbs" class="bbs.Bbs" scope="page" />
<jsp:setProperty name="bbs" property="bbsTitle" />
<jsp:setProperty name="bbs" property="bbsContent" />
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>JSP 게시판 웹 사이트</title>
</head>
<body>
	<%
		String userID = null;
		if (session.getAttribute("userID") != null) {
			userID = (String) session.getAttribute("userID");
		}
		if (userID == null) {
			PrintWriter script = response.getWriter();
			script.println("<script>");
			script.println("alert('로그인을 하세요.')");
			script.println("</script>");
			script.println("<script>");
			script.println("location href='login.jsp'");
			script.println("</script>");
		} else {
			if (bbs.getBbsTitle() == null || bbs.getBbsContent() == null) {
				PrintWriter script = response.getWriter();
				script.println("<script>");
				script.println("alert('입력이 안 된 사항이 있습니다.')");
				script.println("</script>");
				script.println("<script>");
				script.println("history.back()");
				script.println("</script>");
			} else {
				BbsDAO bbsDAO = new BbsDAO();
				int result = bbsDAO.write(bbs.getBbsTitle(), userID, bbs.getBbsContent());
				if (result == -1) {
					PrintWriter script = response.getWriter();
					script.println("<script>");
					script.println("alert('글쓰기에 실패했습니다.')");
					script.println("</script>");
					script.println("<script>");
					script.println("history.back()");
					script.println("</script>");
				} else {
					PrintWriter script = response.getWriter();
					script.println("<script>");
					script.println("location.href='bbs.jsp'");
					script.println("</script>");
				}
			}
		}
	%>
</body>
</html>

인프런 커뮤니티 질문&답변