HashMap serialization does not work

[Stepan Koltsov]

>Submitter-Id:  net
>Originator:    Stepan Koltsov
>Organization:  
>Confidential:  no
>Synopsis: HashMap serialization does not work
>Severity: serious
>Priority:      medium
>Category:      libgcj
>Class:         sw-bug
>Release:       3.3.1 20030722 (Debian prerelease) (Debian testing/unstable)
>Environment:
System: Linux banana.mx1.ru 2.4.18 #3 Thu Jun 27 17:31:10 UTC 2002 i686 
GNU/Linux
Architecture: i686

        
host: i386-pc-linux-gnu
build: i386-pc-linux-gnu
target: i386-pc-linux-gnu
configured with: ../src/configure -v 
--enable-languages=c,c++,java,f77,pascal,objc,ada,treelang --prefix=/usr 
--mandir=/usr/share/man --infodir=/usr/share/info 
--with-gxx-include-dir=/usr/include/c++/3.3 --enable-shared --with-system-zlib 
--enable-nls --without-included-gettext --enable-__cxa_atexit 
--enable-clocale=gnu --enable-debug --enable-java-gc=boehm 
--enable-java-awt=xlib --enable-objc-gc i386-linux
>Description:

Library serialize class HashMap incorrectly -- it reads empty map from stream.

>How-To-Repeat:

Source code:

===
import java.io.*;
import java.util.*;

public class Main {
        public static void main(String[] args) throws Exception {
                ObjectOutputStream oo =
                                new ObjectOutputStream(new 
FileOutputStream("1"));
                Map m = new HashMap();
                m.put("12", "13");
                m.put("45", "67");
                System.out.println(m);
                oo.writeObject(m);
                oo.close();
                
                ObjectInputStream ii =
                                new ObjectInputStream(new FileInputStream("1"));
                Object n = ii.readObject();
                System.out.println(n);
        }
}
===

Prints 

{12=13, 45=67}
{}

when invoking class with gij or after compiling with gcj, on Linux and FreeBSD.
It should print

{12=13, 45=67}
{12=13, 45=67}

this is output of Sun's Java.

>Fix:

I don't know.