Help! Problem with reading objects from file

Question

I wrote a "Library" program for an assignment, and one of the requirements is that the library store all of its information to file upon exit, and reload this information from file when run.
Well, the writing to file part is working. I'm using a FileOutputStream object and an ObjectOutputStream object. I can tell from the file size of the .dat file that information is going into it.
But what I can't do is read from file. For that, I'm using a FileInputStream and an ObjectInputStream. I keep getting this exception:
java.io.EOFException
     at java.io.DataInputStream.readInt(Unknown Source)
     at java.io.ObjectInputStream$BlockDataInputStream.readInt(Unknown Source)
     at java.io.ObjectInputStream.readInt(Unknown Source)
     at Library.readDataFromFile(Library.java:350)
     at Library.<init>(Library.java:63)
     at LibraryDriver.main(LibraryDriver.java:6)I looked this exception up and it says it's thrown when a data input stream unexpectedly ends....But I am instantiating the input streams just before I try to read from file:
                        fileInStream = new FileInputStream(libraryFile);
               objInStream = new ObjectInputStream(fileInStream);
               Object[] objectArray = new Object[objInStream.readInt()];Both input streams have methods that "return the number of bytes that can be read from this file input stream without blocking". Just for kicks, I tried writing that number to the console.
For the FileInputStream, I get 404 bytes.
For the ObjectInputStream, I get 0 bytes.
So I guess it's a problem with the ObjectInputStream? Anyone have any suggestions as to how I can fix this, please?

Answer 1

Yep, here's the relevant code from the writeToFile() method:
                      for (int i = 0; i < libraryAuthors.length; i++) {
                    currentAlphaAuthorList = libraryAuthors;
                    for (int j = 0; j < currentAlphaAuthorList.size(); j++) {
                         currentAuthor = (Author) currentAlphaAuthorList.get(j);
                         objOutStream.writeObject(currentAuthor);
               objOutStream.flush();
               objOutStream.close();