How to solve this java.lang.NoClassDefFoundError: org/apache/commons/io/output/DeferredFileOutputStream?
servlets, tomcat5.5, upload
Solution
The particular exception message is telling you that the mentioned class is missing in the classpath. As the `org.apache.commons.io` package name hints, the mentioned class is part of the `http://commons.apache.org/io` project.
And indeed, Commons FileUpload has Commons IO as a dependency. You need to download and drop `commons-io.jar` in the `/WEB-INF/lib` as well.
See also:
- How to upload files to server using JSP/Servlet?
- How to add JAR libraries to WAR project without facing java.lang.ClassNotFoundException? Classpath vs Build Path vs /WEB-INF/lib
- How do I import the javax.servlet API in my Eclipse project?
Problem
I am using the below code to upload a file in to tomcat5.5 and it gives me the following exception `java.lang.NoClassDefFoundError: org/apache/commons/io/output/DeferredFileOutputStream` could you please help me to find it out? ``` import java.io.File; import java.io.IOException; import java.util.Iterator; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileItemFactory; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; /** * Servlet implementation class FileUploadServlet */ public class FileUploadServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public FileUploadServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ @SuppressWarnings("rawtypes") protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub boolean isMultipart = ServletFileUpload.isMultipartContent(request); System.out.println("Status : "+isMultipart); if (isMultipart) { FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); try { List items = upload.parseRequest(request); Iterator iterator = items.iterator(); while (iterator.hasNext()) { FileItem item = (FileItem) iterator.next(); if (!item.isFormField()) { String fileName = item.getName(); String root = getServletContext().getRealPath("/"); File path = new File(root + "/uploads"); if (!path.exists()) { boolean status = path.mkdirs(); } File uploadedFile = new File(path + "/" + fileName); System.out.println(uploadedFile.getAbsolutePath()); item.write(uploadedFile); } } } catch (FileUploadException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } response.sendRedirect("upload.jsp"); } } ``` this is the jar i use `commons-fileupload-1.2.2.jar`