在Java中處理「java.lang.NoClassDefFoundError」

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我試圖通過我的java代碼執行文件附件操作。但它在我的控制檯輸出中返回「java.lang.NoClassDefFoundError」。你能幫我解決這個問題嗎？在我的代碼中沒有任何問題。在Java中處理「java.lang.NoClassDefFoundError」

以下是我的代碼：

import java.io.BufferedReader; 
import java.io.File; 
import java.io.InputStreamReader; 
import java.nio.charset.Charset; 

import org.apache.http.HttpEntity; 

import org.apache.http.HttpResponse; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpPost; 

import org.apache.http.entity.mime.HttpMultipartMode; 
import org.apache.http.entity.mime.MultipartEntity; 
import org.apache.http.entity.mime.content.FileBody; 
import org.apache.http.entity.mime.content.StringBody; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.protocol.HTTP; 


    public static void main(String[] args) throws Exception { 
      HttpClient httpClient = new DefaultHttpClient(); 
      HttpPost httpPost = new HttpPost("http://watsonexp-stg.corp.adobe.com/watson/api/bug/addAttachmentAPI.jsp"); 

      //to make a multipart POST request 
      MultipartEntity multipartEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE, null, Charset.forName(HTTP.UTF_8)); 
      multipartEntity.addPart("appGUID", new StringBody("e2513b90-f327-4cc0-8c07-2d79a1b6eddd")); 
      multipartEntity.addPart("userId", new StringBody("karansha")); 
      multipartEntity.addPart("password", new StringBody("RGVsbCUxMDA=")); 
      multipartEntity.addPart("bugId", new StringBody("3402114")); 

      multipartEntity.addPart("fileDescription", new StringBody("trying to attach a file")); 
      multipartEntity.addPart("external", new StringBody("false")); 
      multipartEntity.addPart("Filedata", new FileBody(new File("C:/Users/karansha/Desktop/test.jpg"))); 

      httpPost.setEntity(multipartEntity); 

      HttpResponse res= httpClient.execute(httpPost); 

      //following lines will print out the respose from the server on attempting to upload a file. 

      HttpEntity httpEntity = res.getEntity(); 
      BufferedReader br = new BufferedReader(new InputStreamReader(httpEntity.getContent())); 
      String line = ""; 
      while ((line = br.readLine()) != null){ 
       System.out.println(line); 
      } 
     } 
    }

來源

2013-04-16 Sonu Krishan

發佈完整的堆棧跟蹤 – Apurv

您是否介意顯示您的'import'行 – arajek

@SonuKrishan上述代碼中的哪一行是拋出異常並不清楚。請像Apurv詢問那樣發佈完整的堆棧跟蹤。 – Philipp

這意味着，有一些類，你必須在編譯時以某種方式在運行時失蹤。在編譯期間記下你的類路徑並將其與運行時環境進行比較。這應該可以幫助你找到你失蹤的班級。

來源

2013-04-16 12:19:37 Tom

在Java中處理「java.lang.NoClassDefFoundError」

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