Is serialization broken?

[Barnet Wagman <wagman at enteract dot com>]

I'm getting an erroneous ClassCastException deserializing an object with
gcj,  gcc version 2.97 20010117 (experimental).

With the test program SerTest.java (below), I do the following
 

> bash-2.03$ gcj -C SerTest.java
> bash-2.03$ gcj --main=SerTest SerTest.class
> bash-2.03$ a.out S
> 1000  1000  1000.0 10
The serialization file gets created, but on deserialization:
> bash-2.03$ a.out D
> IOException from util.SerializeU.deserializeObject(): java.io.IOException
> Exception in thread "main" java.lang.ClassCastException
>    at 0x401991ca: java::lang::Throwable::Throwable()
> (/usr/local/gcc/lib/libgcj.so.1)
>    at 0x4018cc9d: java::lang::Exception::Exception()
> (/usr/local/gcc/lib/libgcj.so.1)
>    at 0x401911dd: java::lang::RuntimeException::RuntimeException()
> (/usr/local/gcc/lib/libgcj.so.1)
>    at 0x4018af5d: java::lang::ClassCastException::ClassCastException()
> (/usr/local/gcc/lib/libgcj.so.1)
>    at 0x401782ab: _Jv_CheckCast (/usr/local/gcc/lib/libgcj.so.1)
>    at 0x0804c484: SerTest::main(JArray<java::lang::String*>*)
> (/home/moi/GCJ_JavaTree/SerTest.class:0)
>    at 0x4017498b: gnu::gcj::runtime::FirstThread::run()
> (/usr/local/gcc/lib/libgcj.so.1)
>    at 0x4017facb: java::lang::Thread::run_(java::lang::Object*)
> (/usr/local/gcc/lib/libgcj.so.1)
>    at 0x402a0d5a: _Jv_ThreadStart(java::lang::Thread*,
> int*, void (*)(java::lang::Thread*)) (/usr/local/gcc/lib/libgcj.so.1)
>    at 0x4017fbff: java::lang::Thread::start() (/usr/local/gcc/lib/libgcj.so.1)
>    at 0x4015dea2: JvRunMain (/usr/local/gcc/lib/libgcj.so.1)
>    at 0x0804cea3: main (/tmp/ccJoVWObmain.i:0)
>    at 0x40473a5e: __libc_start_main (/lib/libc.so.6)
>    at 0x08049a91: _start (??:0)
Any thoughts or suggestions?

Thanks,

Barnet

---

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

public class SerTest implements Serializable {

    HashMap hm;
    double[] v;

    public SerTest() {
        hm = new HashMap();
        v = new double [1000];

        for ( int i = 0; i < v.length; i++ ) {
            v[i] = ((double) i) * 100.0;
            hm.put(new Integer(i), new Integer(i));
        }
    }

    public static void main(String[] argv) {
        SerTest st = null;
        if ( argv.length == 1 ) {
            if ( argv[0].equals("S") ) {
                st = new SerTest();
                serializeObject(st,"/home/moi/GCJ_JavaTree/xxx.ser");
            }
            else if ( argv[0].equals("D") ) {
                st = (SerTest) deserializeObject("/home/moi/GCJ_JavaTree/xxx.ser");
            }
            System.err.println(st.hm.size() + "  " + st.v.length + "  " + st.v[10] + " "
                               + st.hm.get(new Integer(10)) );
        }
    }

    public static boolean serializeObject(Object obj, String filename) {
             // If the file already exists, delete it.
        File f = new File(filename);
        if ( f.exists() )
            f.delete();
        try {
             FileOutputStream fos = new FileOutputStream(filename);
             ObjectOutputStream oos = new ObjectOutputStream(fos);
             oos.writeObject(obj);
             oos.flush();
             fos.close();
         }
         catch (IOException e) {
             System.err.println("IOException " + e );
             return(false);
         }
         return(true);
    }

 
    public static Object deserializeObject(String filename) {
        try {
            FileInputStream fis = new FileInputStream(filename);
            ObjectInputStream ois = new ObjectInputStream(fis);
            Object obj = ois.readObject();
            ois.close();
            return(obj);
         }
         catch (FileNotFoundException e) {
             System.err.println("FileNotFoundException " + e );
         }
         catch (IOException ex) {
             System.err.println("IOException " + ex );
         }
         catch (ClassNotFoundException ec) {
             System.err.println("ClassNotFoundException " + ec );
         }
         return(new Object());
    }
}