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Author Topic: java.io.NotSerializableException  (Read 6834 times)

Abhilash K

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  • Posts: 64
java.io.NotSerializableException
« on: December 13, 2006, 05:57:57 AM »

Hii,

      I tried to connect to a URL from my client and tried to extract information from it.  Thing is that I can display the contents in node termila but its working continuously and the task is not finishing up.  The log file erros are as follows.
-------------------------------------------------------------------------
2006-12-13 10:00:34,921 [INFO ][org.jppf.node.NodeLauncher.main(63)]: starting node
2006-12-13 10:00:59,406 [ERROR][org.jppf.server.node.JPPFNode.run(152)]: sun.net.www.protocol.http.HttpURLConnection$HttpInputStream
java.io.NotSerializableException: sun.net.www.protocol.http.HttpURLConnection$HttpInputStream
   at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1081)
   at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
   at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
   at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
   at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
   at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
   at org.jppf.utils.ObjectSerializerImpl.serialize(ObjectSerializerImpl.java:55)
   at org.jppf.utils.SerializationHelperImpl.writeNextObject(SerializationHelperImpl.java:174)
   at org.jppf.server.node.JPPFNode.writeResults(JPPFNode.java:373)
   at org.jppf.server.node.JPPFNode.perform(JPPFNode.java:198)
   at org.jppf.server.node.JPPFNode.run(JPPFNode.java:143)
   at org.jppf.node.NodeLauncher.main(NodeLauncher.java:71)

----------------------------------------------------------
pls get me a solution for the same.

           my taks code is as follows.
----------------------------------------------------------
package sample.hello;

import org.jppf.server.protocol.JPPFTask;
import java.net.*;
import java.io.*;

public class FileDownloadTestTask extends JPPFTask
{   
   URL url;
   InputStream is;
   String str=null;
   
   public FileDownloadTestTask(URL url) throws MalformedURLException{
      this.url=url;
      System.out.println("Constructing Task... ");
      System.out.println("First : "+url.getPort());
   }
   public void run(){
      try{
            int c,k=0;
           is=url.openStream();
         char[] ch=new char[is.available()];
         if(is.available()>0){
            int i=is.available();
            while(((c=is.read())!= -1)&&(--i > 0)){
               ch[k++]=(char)c;
            }
         }
         // BufferedReader br=new BufferedReader(new InputStreamReader(is));
           // str=br.readLine();
         str=new String(ch);
           System.out.println(str);
         
            }
            catch(Exception e){
              e.printStackTrace();
            }
      }
   
   public Object getResult(){
       return str;
    }
}
----------------------------------------------------------------
 pls get me a solution.

regds - abhilash
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lolo

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  • Posts: 2262
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java.io.NotSerializableException
« Reply #1 on: December 13, 2006, 03:34:17 PM »

Hell Abhilash,

The problem comes from the input stream that you declared as an instance variable in your task:
Code: [Select]
InputStream is;
In the JDK, streams are not serializable. So you need to make it transient:
Code: [Select]
transient inputStream is;
This way, JPPF won't try to serialize/deserialize it when you submit the task or when its results are sent back.

-Laurent
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Abhilash K

  • JPPF Grand Master
  • ****
  • Posts: 64
Thanx
« Reply #2 on: December 19, 2006, 11:00:56 AM »

Hii Laurent,

         Thanks for the information.  now its working fine.  thanks a lot.

regds,
         abhilash
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