Attachements with apache commons fileupload

Question

I'm using:
http://commons.apache.org/fileupload/
to write file on server side (Tomcat running on Windows with XP or 2003).
I'm sending data to servlet with doPost() as follows:
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            DiskFileItemFactory factory = new DiskFileItemFactory();
            factory.setSizeThreshold(4096);
            factory.setRepository(new File("test"));
            ServletFileUpload upload = new ServletFileUpload(factory);
            upload.setSizeMax(1000000);
            List fileItems = upload.parseRequest(request);
            Iterator i = fileItems.iterator();
            String comment = ((FileItem) i.next()).getString();
            FileItem fi = (FileItem) i.next();
            String fileName = fi.getName();
            // db
            fi.write(new File("C:/", fileName));
        } catch (Exception ex) {
            out.print(ex.getMessage());
        out.close();
    }but it's response is:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Servlet execution threw an exception
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
root cause
java.lang.NoClassDefFoundError: org/apache/commons/io/output/DeferredFileOutputStream
     org.apache.commons.fileupload.disk.DiskFileItemFactory.createItem(DiskFileItemFactory.java:196)
     org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:358)
     org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:126)
     Upload.doPost(Upload.java:69)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
root cause
java.lang.ClassNotFoundException: org.apache.commons.io.output.DeferredFileOutputStream
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1360)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1206)
     java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
     org.apache.commons.fileupload.disk.DiskFileItemFactory.createItem(DiskFileItemFactory.java:196)
     org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:358)
     org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:126)
     Upload.doPost(Upload.java:69)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.16 logs.
Apache Tomcat/6.0.16don't know why.. any ideas?

Answer 1

java.lang.ClassNotFoundException: org.apache.commons.io.output.DeferredFileOutputStreamThe mentioned class is missing in the runtime classpath.
Add it (in this specific case, the JAR file with the mentioned class) to the classpath and the problem will disappear.
This class is part of Commons IO. Read the dependencies page at FileUpload user guide which JAR's you all need.