[Bug classpath/25313] New: InetAddress objects do not serialize/deserialize

[Josh at allDucky dot com]

When attempting to serialize an InetAddress to a byte array and subsequently
deserialize the array to reconstruct a new InetAddress, the result is always a
null Object.

This operation works properly using Sun Java 1.5:
   java version "1.5.0_06"
   Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
   Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)

I tested the following combinations:
   sun compiler, sun jvm/classpath --> success
   sun compiler, gij jvm/classpath --> failed
   gcj compiler, gij jvm/classpath --> failed
   gcj compiler, sun jvm/classpath --> success
   gcj compiler to a.out --> failed

Thus, I think its pretty clear the the problem lies in the gnu classpath
libraries.

Here is the source code that I used to produce the problem.

===============================================================================
GCJBug.java
===============================================================================
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.InetAddress;

/**
 * @author jdanziger
 *
 */
public class GCJBug
{

   /**
    * @param args   (duh)
    */
   public static void main(String[] args)
   {
      InetAddress addr, copy ;
      byte[] serialized_data ;

      try { addr = InetAddress.getLocalHost() ; }
      catch (Exception e) { throw new RuntimeException(e) ; }

      serialized_data = serializeObject(addr) ;
      copy = (InetAddress) deserializeObject(serialized_data) ;

      System.out.println("serialized_data length: " + serialized_data.length +
                         " bytes.") ;
      System.out.println("addr: " + addr) ;
      System.out.println("copy: " + copy) ;


   } // end public static void main(String[] args)


   /**
    * Converts the object to a serialized byte array, which saves us the
    * trouble of making a binary format for sending the data across the
    * network
    * 
    * There is a possibility that this function causes deadlock if the size
    * of the serialized object is greater than the allocated byte buffer,
    * but I am not sure if there is an easy way to fix it.  For now, we assume
    * that everything that we try to seralize is less than that size, or
    * else it would never make it across the network.
    * 
    * @return a byte array representing the serialized version of this object
    */
   public static byte[] serializeObject(Object o)
   {
      /* we try to make the buffer large enough to avoid deadlock */
      ByteArrayOutputStream byte_out = new ByteArrayOutputStream(1024) ;
      ObjectOutputStream obj_out ;

      try
      {
         obj_out = new ObjectOutputStream(byte_out) ;
         obj_out.writeObject(o) ;
      }
      catch (IOException e)
      {
         throw new RuntimeException(e) ;
      }

      return byte_out.toByteArray() ;

   } // end public static byte[] serializeObject(Object o)

   /**
    * Converts a byte stream created by serializeObject() to an object.  Its
    * real type can be determined using the instanceof operator.
    *  
    * @see serializeObject() 
    * @return the object represented by the byte array
    */
   public static Object deserializeObject(byte[] b)
   {
      ByteArrayInputStream bis = new ByteArrayInputStream(b) ;
      ObjectInputStream ois ;
      Object o ;

      try
      {
         ois = new ObjectInputStream(bis) ;
         o = ois.readObject() ;
      }
      catch (Exception e)
      {
         throw new RuntimeException("Error deserializing object") ;
      }

      return o ;

   } // end public static Object deserializeObject(byte[] b)

} // end class

===============================================================================
END GCJBug.java
===============================================================================


-- 
           Summary: InetAddress objects do not serialize/deserialize
           Product: classpath
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: classpath
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: Josh at allDucky dot com
 GCC build triplet: i386-redhat-linux
  GCC host triplet: i386-redhat-linux
GCC target triplet: i386-redhat-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25313