By libprotobuf.jar I assume you mean the classes compiled during
installation?
I have them in the build path, and they work on the java tutorial
project from the protobuf site.
Is there any other reason it wouldn't find the class?
On Nov 28, 5:48 am, Kenton Varda <ken...@google.com> wrote:
> Looks like libprotobuf.jar is missing. The code generated by protoc depends
> on this library.
>
> On Fri, Nov 27, 2009 at 5:06 AM, Hershiv Haria <darkmaste...@gmail.com>wrote:
>
> > I am trying out protocol buffers for the first time, and have written
> > a simple client and servlet to send and receive the PB. It will run on
> > App Engine. However every time I try it hits a NoClassDefFoundError
> > for GeneratedMessages.
>
> > The error is:
>
> > ov 27, 2009 12:54:38 PM com.google.apphosting.utils.jetty.JettyLogger
> > warn
> > WARNING: Error for /testfileupload
> > java.lang.NoClassDefFoundError: com/google/protobuf/GeneratedMessage
> > at java.lang.ClassLoader.defineClass1(Native Method)
> > at java.lang.ClassLoader.defineClass(ClassLoader.java:700)
> > at
> > java.security.SecureClassLoader.defineClass(SecureClassLoader.java:
> > 124)
> > at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
> > at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
> > at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
> > at java.security.AccessController.doPrivileged(Native Method)
> > at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> > at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
> > at
> > com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass
> > (IsolatedAppClassLoader.java:151)
> > at java.lang.ClassLoader.loadClass(ClassLoader.java:254)
> > at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:399)
> > at my.testfiletransfer.TestFileUploadServlet.doGet
> > (TestFileUploadServlet.java:28)
> > at my.testfiletransfer.TestFileUploadServlet.doPost
> > (TestFileUploadServlet.java:20)
> > at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
> > at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
> > at
> > org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
> > 487)
> > at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
> > (ServletHandler.java:1093)
> > at
> > com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
> > (TransactionCleanupFilter.java:43)
> > at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
> > (ServletHandler.java:1084)
> > at com.google.appengine.tools.development.StaticFileFilter.doFilter
> > (StaticFileFilter.java:121)
> > at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
> > (ServletHandler.java:1084)
> > at org.mortbay.jetty.servlet.ServletHandler.handle
> > (ServletHandler.java:360)
> > at org.mortbay.jetty.security.SecurityHandler.handle
> > (SecurityHandler.java:216)
> > at org.mortbay.jetty.servlet.SessionHandler.handle
> > (SessionHandler.java:181)
> > at org.mortbay.jetty.handler.ContextHandler.handle
> > (ContextHandler.java:712)
> > at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
> > 405)
> > at
> > com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle
> > (DevAppEngineWebAppContext.java:54)
> > at org.mortbay.jetty.handler.HandlerWrapper.handle
> > (HandlerWrapper.java:139)
> > at com.google.appengine.tools.development.JettyContainerService
> > $ApiProxyHandler.handle(JettyContainerService.java:342)
> > at org.mortbay.jetty.handler.HandlerWrapper.handle
> > (HandlerWrapper.java:139)
> > at org.mortbay.jetty.Server.handle(Server.java:313)
> > at
> > org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
> > 506)
> > at org.mortbay.jetty.HttpConnection$RequestHandler.content
> > (HttpConnection.java:844)
> > at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
> > at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
> > at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
> > at org.mortbay.io.nio.SelectChannelEndPoint.run
> > (SelectChannelEndPoint.java:396)
> > at org.mortbay.thread.BoundedThreadPool$PoolThread.run
> > (BoundedThreadPool.java:442)
> > Caused by: java.lang.ClassNotFoundException:
> > com.google.protobuf.GeneratedMessage
> > at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
> > at java.security.AccessController.doPrivileged(Native Method)
> > at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> > at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
> > at
> > com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass
> > (IsolatedAppClassLoader.java:151)
> > at java.lang.ClassLoader.loadClass(ClassLoader.java:254)
> > at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:399)
> > ... 39 more
>
> > ------------------------------------------------------------------------------------------------------
>
> > The client is:
>
> > package my.testfiletransfer;
>
> > import java.io.BufferedReader;
> > import java.io.File;
> > import java.io.FileReader;
> > import java.io.IOException;
> > import java.io.InputStreamReader;
> > import java.net.URL;
> > import java.net.URLConnection;
>
> > import my.tft.protos.RandomMessageProtos.Note;
> > import my.tft.protos.RandomMessageProtos.RandomMessage;
>
> > public class TestFileUploadClient {
>
> > public static void main(String[] args) {
>
> > BufferedReader in = null;
> > try {
> > System.out.println("starting client");
> > File source = new
> > File("/Users/darkmaster108/Documents/blarg.txt");
> > URL url = new URL("
> >http://localhost:8080/testfileupload";);
> > URLConnection urlc = url.openConnection();
> > urlc.setDoOutput(true);
> > urlc.connect();
>
> > RandomMessage.Builder randomMessage =
> > RandomMessage.newBuilder();
> > Note.Builder note = Note.newBuilder();
> > note.setName(source.getName());
> > StringBuffer sb = new StringBuffer();
>
> > in = new BufferedReader(new FileReader(source));
>
> > String line;
> > while ((line = in.readLine()) != null)
> > sb.append(line);
>
> > note.setMessage(sb.toString());
>
> > randomMessage.addNote(note);
>
> > randomMessage.build().writeTo(urlc.getOutputStream());
> > urlc.getOutputStream().close();
>
> > BufferedReader rd = new BufferedReader(new
> > InputStreamReader(urlc
> > .getInputStream()));
>
> > System.out.println("Respose is:");
> > while ((line = rd.readLine()) != null) {
> > System.out.println(line);
> > }
> > rd.close();
>
> > } catch (Exception e) {
> > e.printStackTrace();
> > } finally {
> > if (in != null) {
> > try {
> > in.close();
> > } catch (IOException e) {
> > e.printStackTrace();
> > }
> > }
> > } // finally
> > }
> > }
>
> > ------------------------------------------------------------------------------------------------------
> > The server is:
>
> > package my.testfiletransfer;
>
> > import java.io.IOException;
> > import java.io.InputStream;
> > import java.io.PrintWriter;
>
> > import javax.servlet.http.HttpServlet;
> > import javax.servlet.http.HttpServletRequest;
> > import javax.servlet.http.HttpServletResponse;
>
> > import my.tft.protos.RandomMessageProtos.RandomMessage;
>
> > @SuppressWarnings("serial")
> > public class TestFileUploadServlet extends HttpServlet {
>
> > public void doPost(HttpServletRequest req, HttpServletResponse resp)
> > throws IOException {
> > doGet(req, resp);
> > }
>
> > public void doGet(HttpServletRequest req, HttpServletResponse resp)
> > throws IOException {
>
> > try {
> > InputStream is = req.getInputStream();
> > RandomMessage randomMessage =
> > RandomMessage.parseFrom(is);
> > is.close();
>
> > System.err.println("Name: " +
> > randomMessage.getNote(1).getName());
> > System.err.println("Message: " +
> > randomMessage.getNote(1).getMessage
> > ());
>
> > PrintWriter out = resp.getWriter();
> > out.println("ok");
> > out.close();
> > } catch(Exception e) {
> > System.err.println(e.getMessage());
> > }
> > }
> > }
>
> > Any help would be much appreciated, I'm sure I'm making a silly little
> > mistake.
>
> > --
>
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> > .
> > For more options, visit this group at
> >http://groups.google.com/group/protobuf?hl=en.
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