asked on

restore from saved objects?

Hi nice folks,

I'm writing some code relevant to object I/O. The program saves
three objects, a Long, a Vector of some self defined class, and a
Hashset of some self defined class, to a file. Later on it reads
out those objects from the saved file. Problem occurs right here.
It throws out a file.java.io.EOFException when reading the very
first objects. Does anybody have any clue what's wrong here? BTW,
the java compiler is a 1.3 version one. Thanks.

SR

TimYates

You'll have to post your source code :-)

Tim

FaithNoMore

If you posted your current code, it might give us a better idea.

FaithNoMore

Sorry for extra post, Tim just beat me :)

TimYates

Hee hee :-)

summer_soccer

ASKER

Actually it's part of a big package. Actually, now I've tried as follows:

try{
String storedStatesFile = "hoststates-data";
ObjectOutputStream outToStatesFile = new ObjectOutputStream(new FileOutputStream(storedStatesFile));
outToStatesFile.writeLong(System.currentTimeMillis());
outToStatesFile.close();

ObjectInputStream inFromStatesFile = new ObjectInputStream(new FileInputStream(storedStatesFile));

Long lastSaveTime = inFromStatesFile.readLong();
}
catch(Exception e) {
System.out.println("Exception: "+e);
}

The program threw out an EOFException when it tries to readLong from storedStatesFile.

Does anybody have any clue on this? Thanks a lot.

SR

ASKER CERTIFIED SOLUTION

TimYates

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

TimYates

and don't forget:

inFromStatesFile.close() ;

FaithNoMore

Could try this:

outToStatesFile.writeObject(new Long(System.currentTimeMillis()));

Long lastSaveTime = (Long)inFromStatesFile.readObject();

also, inFromStatesFile.readLong(); returns a 'long' value, not Long.

TimYates

Yeah...like I said ;-)

glottis

if that doesnt help (which i am pretty sure IT WILL) see if the object is ever written to the file

Mayank S

No offence, folks, but I'd prefer saving 3 different kinds of objects into 3 different files, or else make another class which would wrap these 3 objects in it, and then write that one to the file.

Cheers,

Mayank.

glottis

easy doing that also. save all your objects into a vector and save vector in the file. next time load the vector and cast the elements back to your own objects

FaithNoMore

Tim your too fast for me ;).