Request Scope

▪️Human2.java
package model;

import java.io.Serializable;

public class Human2 implements Serializable {
    private static final long serialVersionUID = 1L;
    private String name;
    private int age;

    public Human2() {

    }

    public Human2(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

}

▪️Test13Jsp.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ page import="model.Human2"%>
<%
    Human2 human2 = new Human2("湊", 23);
    //リクエストスコープからインスタンスを取得
    Human2 h2 = (Human2) request.getAttribute("human2");
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>JSPでリクエストスコープ</title>
</head>
<body>
    <p>
        <%=h2.getName()%>さんは<%=h2.getAge()%>歳です
    </p>
</body>
</html>

▪️Error Log
HTTPステータス 500 - An exception occurred processing JSP page /Test13Jsp.jsp at line 17

type 例外レポート

メッセージ An exception occurred processing JSP page /Test13Jsp.jsp at line 17

説明 The server encountered an internal error that prevented it from fulfilling this request.

例外

org.apache.jasper.JasperException: An exception occurred processing JSP page /Test13Jsp.jsp at line 17

14: </head>
15: <body>
16:     <p>
17:         <%=h2.getName()%>さんは<%=h2.getAge()%>歳です
18:     </p>
19: </body>
20: </html>


Stacktrace:
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:575)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
原因

java.lang.NullPointerException
    org.apache.jsp.Test13Jsp_jsp._jspService(Test13Jsp_jsp.java:100)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
注意 原因のすべてのスタックトレースは、Apache Tomcat/7.0.67のログに記録されています