質問編集履歴
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コードを質問本文に記載しました
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File without changes
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@@ -4,8 +4,127 @@
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画像では、関数の結果（H2 Databaseより値を取得）を配列に渡し、その結果をリクエストセッションに設定しているのですが、
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5
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Nullで設定されjspでNullPointerExceptionとなります。
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7
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+
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8
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Nullになる理由はなぜでしょうか。
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10
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開発環境：Eclipse
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12
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コードは以下となります。
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```Java
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15
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・サーブレット
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16
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@WebServlet("/Main")
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public class Main extends HttpServlet {
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private static final long serialVersionUID = 1L;
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/**
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* @see HttpServlet#HttpServlet()
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*/
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public Main() {
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super();
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// TODO Auto-generated constructor stub
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}
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/**
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* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
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*/
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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// TODO Auto-generated method stub
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33
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GetMutterListLogic getMutterListLogic = new GetMutterListLogic();
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34
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List<Mutter> mutterList = getMutterListLogic.execute();
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35
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request.setAttribute("mutterList", mutterList);
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HttpSession session = request.getSession();
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39
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User loginUser = (User) session.getAttribute("loginUser");
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40
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if(loginUser == null) {
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response.sendRedirect("/docoTsubu/");
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}else {
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RequestDispatcher dispatcher = request.getRequestDispatcher("/WEB-INF/jsp/main.jsp");
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dispatcher.forward(request, response);
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}
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}
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/**
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* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
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*/
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protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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// TODO Auto-generated method stub
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-
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request.setCharacterEncoding("UTF-8");
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String text = request.getParameter("text");
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if(text !=null && text.length() !=0) {
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HttpSession session = request.getSession();
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User loginUser = (User)session.getAttribute("loginUser");
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Mutter mutter = new Mutter(loginUser.getName(),text);
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PostMutterLogic postMutterLogic = new PostMutterLogic();
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postMutterLogic.execute(mutter);
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64
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} else {
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request.setAttribute("errorMsg", "入力されていません");
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}
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GetMutterListLogic getMutterListLogic = new GetMutterListLogic();
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List<Mutter> mutterList = getMutterListLogic.execute();
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request.setAttribute("mutterList", mutterList);
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RequestDispatcher dispatcher = request.getRequestDispatcher("/WEB-INF/jsp/main.jsp");
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dispatcher.forward(request, response);
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}
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}
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・JSP
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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<%@ page import="model.User,model.Mutter,java.util.List" %>
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<%
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User loginUser = (User) session.getAttribute("loginUser");
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List<Mutter>mutterList = (List<Mutter>) application.getAttribute("mutterList");
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%>
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86
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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90
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<title>test</title>
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</head>
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<body>
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<h1>どこつぶメイン</h1>
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<p>
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<%= loginUser.getName() %>さん、ログイン中
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<a href = "/docoTsubu/Logout">ログアウト</a>
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</p>
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<p><a href= "/docoTsubu/Main">更新</a></p>
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<form action = "/docoTsubu/Main" method="post">
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<input type="text" name = "text">
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<input type="submit" value= "つぶやく">
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</form>
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<% for(Mutter mutter : mutterList) {%>
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<p><%= mutter.getName() %>:<%= mutter.getText() %></p>
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<%} %>
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106
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</body>
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107
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</html>
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108
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109
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・クラス
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110
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public class Mutter implements Serializable{
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111
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112
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private String userName;
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113
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private String text;
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114
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private int id;
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115
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+
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116
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public Mutter() {}
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117
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public Mutter(String userName,String text) {
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118
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this.userName = userName;
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119
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this.text = text;
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120
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}
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121
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public Mutter(int id,String userName,String text) {
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122
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this.id = id;
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123
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this.userName = userName;
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124
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this.text = text;
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125
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}
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126
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public int getId() {return id;}
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127
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public String getName() {return userName;}
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128
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public String getText() {return text;}
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129
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}
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130
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+
```
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