Question

我正在尝试使用tomcat 8.5.23运行应用程序，但我一遍又一遍地得到同样的错误。每次我尝试启动tomcat并打开本地主机时，我都会收到HTTP状态500错误。这是错误：org.apache.jasper.JasperException：在第[19]行处理JSP页面[/index.jsp]时发生异常。这是我的文件（index.jsp和IntagramWB.java）

<html>    
<head>
<meta charset="UTF-8">
<meta name="description" content="Web Services">
<meta name="keywords" content="JSP, Bootstap, HTML5">

<!-- including the jQuery file to the bootstrap -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<!-- including the bootstrap file -->
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>

</head>
<title> My Restful API</title>
<body>
    <%@ page import = "com.mywebservices.InstagramWB" %>

    <% InstagramWB insta = new InstagramWB(); %>
    <% String details = insta.getDetails(); %>


    <script>
        var name = JSON.parse("<%= details %>");
            document.getElementById("name").innerHTML = details.data.full_name;

    </script>

    <h1 id = "name"> </h1>
    <h2>Last place: </h2>
</body>
</html>

我试图从java类调用一个方法。这是我的java文件：

package com.mywebservices;

import java.util.*;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;


public class InstagramWB
{
    public InstagramWB()
    {}

public static String getDetails()
{
    // Variable for the access token
    String accessToken = "269891473.1677ed0.a60ed893764d4c5";
    String replyInsta = "";
    String jsonInsta = "";
    URL url;
    HttpURLConnection connection = null;
    InputStream is = null;

    try
    {
        // Endpoint to get the details of the user
        String endpoint = "https://api.instagram.com/v1/users/self/?access_token="+accessToken;

        // establishing the connection to the endpoint
        url = new URL(endpoint);
        connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");
        connection.connect();
        is = connection.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));

        while ((replyInsta = reader.readLine()) != null)
        {
            jsonInsta = replyInsta;
        }
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }

    return jsonInsta;
}
}

如果需要，这里也是我的文件夹结构 Folders structure

和例外：
exceptions

Answer 1

查看堆栈跟踪的“根本原因”部分。实际错误是java.lang.NoClassDefFoundError：InstagramWB

基本上，在第19行，当你做...

InstagramWB insta = new InstagramWB();

...找不到InstagramWB的.class文件。

您确定您的war文件已正确创建，并且InstagramWB类在其中可用吗？尝试使用任何解压缩实用程序解压缩war文件，例如Winzip，WinRAR等，并检查是否可以在其中找到此类的.class文件。

HTTP状态500 - 尝试从java文件调用方法时出错

1 个答案: