Java ObjectInputStream java.io.EOFException

Question

I'm trying to pass data from MySQL to a client using a socket. For a List, I prefer using an array, but if I send an array using this:

InputStream input = client.getInputStream();
        OutputStream output = client.getOutputStream();
        ObjectOutputStream obOutput = new ObjectOutputStream(output);
        Statement statement = dataConnection.createStatement();
        ResultSet modList = statement.executeQuery("SELECT modID, downloads FROM modRegister");
        String[][] mods = new String[3][3];
        int column = 0;
        while (modList.next()) {
            mods[column][1] = modList.getString("modID");
            mods[column][2] = modList.getString("downloads");
            ++column;
        }

        System.out.println(mods[1][1]);

        PrintWriter printClient = new PrintWriter(output);
        printClient.println(column);
        printClient.close();
        obOutput.writeObject(mods);
        obOutput.flush();

and receive it from the client using this:

Socket server = new Socket("localhost", 25566);
    InputStream input = server.getInputStream();
    OutputStream output = server.getOutputStream();
    ObjectInputStream obInput = new ObjectInputStream(input);
    BufferedReader reader = new BufferedReader(new InputStreamReader(input));
    String s;
    int columns = 0;
    while((s = reader.readLine()) != null) {
        columns = Integer.parseInt(s);
        System.out.println(s);
    }
    String [][] mods;
    TimeUnit.SECONDS.sleep(10);
    mods = (String[][])obInput.readObject();

I get an EOFException, even with a time delay. The array IS valid. I tested printing out all the data in it. Here is the exception:

Caused by: java.io.EOFException
at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2601)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1319)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
at layout.MainStoreController.initialize(MainStoreController.java:36)
... 32 more

could you post the code for `layout.MainStoreController.initialize`? Where in the stack is the code you did post executed? — Blake Yarbrough, Jul 27 '15 at 19:23
Well, thats actually the second code, nothing morein this method. — dav20011, Jul 27 '15 at 19:30
Could you post the entire method definition with; brackets, names, arguments, class names and class paths? — Blake Yarbrough, Jul 27 '15 at 19:35
It's just public void initialize(){theStuff above}, the throwing exceptions are included, the basic initialize method of JavaFX — dav20011, Jul 27 '15 at 20:18

score 2 · Answer 1 · answered Jul 27 '15 at 19:35

2

I suspect that closing the PrintWriter closes the OutputStream it writes to.

PrintWriter printClient = new PrintWriter(output);
printClient.println(column);
printClient.close();

When the stream is closed, then the socket is closed, and the other end will observe End-Of-File as it reads.

answered Jul 27 '15 at 19:35

dsh

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Sure? I dont get any Error in The Server, so I think its sending it – dav20011 Jul 27 '15 at 20:15
You can use wireshark to capture the traffic and see what is actually sent. I am sure you'll see a FIN packet there that closes the connection. – dsh Jul 27 '15 at 20:17
Nahh, replaced the close with a flush to prevent that, still the same error, and poorly, I'm using Windows, which actually doesn't support localhost with Wireshark, don't want to compile everything just to try it on my Ubuntu server. – dav20011 Jul 27 '15 at 21:06

Java ObjectInputStream java.io.EOFException

1 Answers1