在jsp页面中嵌入java代码报错

showMessage.jsp:
<%@ page language="java" import="java.util.*,demo2.Message"
pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

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.line { border-bottom-width: 1px; border-bottom-style: dashed; border-bottom-color: #666; height: 10px; } body { margin-right: auto; margin-left: auto; text-align: center; max-width: 960px; } #main { border: 3px solid #999; background-color: #f5f5f5; padding: 1px; margin-right: auto; margin-left: auto; width: 960px; } #main table tr td { white-space: normal; }

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1) { prep = p - 1; } if (!messageList.isEmpty()) { for (int i = 0; i

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"); } %>

Mseeage.java:
package demo2;

public class Message {
private int id;
private String name;
private String title;
private String content;
private String time;

public String getTime() {
    return time;
}

public void setTime(String time) {
    this.time = time;
}

public String getContent() {
    return content;
}

public void setContent(String content) {
    this.content = content;
}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getName() {
    return name;
}

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

public String getTitle() {
    return title;
}

public void setTitle(String title) {
    this.title = title;
}

}
图片说明

messagelist这个变量为null，上面类型转换可能不正确

nlp了，调试调试就知道了

空指针就看变量的问题