PalmOS: IndexOutOfBoundsException in DataInputStream.read

Question

Hi,
I'm getting IndexOutOfBoundsException when calling DataInputStream's readInt() in my midlet. The code works fine under J2MEwtk emulators, but with POSE (and on my Hansdpring too) I'll get the exception.
Method below tries to download a recordstore via HTTP.
The format of the file on webserver is simple:
<int><data><int><data>...
Where the int parameters specify size of data followed. The exception comes always at same place,
i.e. after some records are read.
Second mysterious thing is, why the exception object is null? So I can't call printStackTrace, while handling the exception...
Here is the code:
private void loadDatabase(String url, String storeName) {
        java.io.DataInputStream inStream = null;
        javax.microedition.rms.RecordStore store = null;
        byte[] buffer = new byte[512];
        try {
            int index = 0;
            int count = 0;
            inStream = Connector.openDataInputStream(url);          
            store = RecordStore.openRecordStore(storeName, true);
            while (true) {                       
                index++;
                try {
                    count = inStream.readInt();
                } catch (java.io.EOFException eofEx) {
                    /* This is normal situation
                     * Let's break the loop
                    break;
                } catch (IndexOutOfBoundsException iobEx) {
                    // Here comes the strange exception. BTW, iobEx == null !?
                    throw iobEx;
                if (count > buffer.length) {
                    buffer = null;
                    Runtime.getRuntime().gc();
                    buffer = new byte[count];
                inStream.readFully(buffer, 0, count);
                store.addRecord(buffer, 0, count);
        } catch (IOException e1) {
            e1.printStackTrace();
        } catch (RecordStoreException e2) {
            e2.printStackTrace();
        } finally {
            try {
                if (inStream != null)
                    inStream.close();
                inStream = null;
            } catch (IOException e3) {}
            try {
                if (store != null)
                    store.closeRecordStore();
                store = null;
            } catch (RecordStoreException e4) {}
    }regards,
- indrek

Answer 1

indrek,
I'm seeing the same exception raised in a similar context on a call to readFully Specifically, my application, like yours, loads a record store from a data file via http. My file format, too, is similar: <short> <short> <data bytes> <short> <short> <data bytes> ... In my read loop I make one call to readFully to read the two shorts into a 4-byte buffer, followed by another call to read the (360) data bytes into a large byte buffer. I always get the exception on the first readFully call in the 4th pass through the loop (interestingly, this is after reading just over 1024 bytes). I get the following stack trace:
java.lang.IndexOutOfBoundsException
     at com.sun.cldc.io.j2me.socket.PrivateInputStream.read(+42)
     at java.io.DataInputStream.read(+10)
     at com.sun.midp.io.j2me.http.Protocol.readBytes(+342)
     at com.sun.midp.io.BaseInputStream.read(+43)
     at java.io.DataInputStream.read(+10)
     at java.io.DataInputStream.readFully(+31)
     at java.io.DataInputStream.readFully(+8)
     at amazons8.midp.BookLoaderMIDlet.loadBook(+118)
     at amazons8.midp.BookLoaderMIDlet$2.run(+22)regards,
bob