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    <pre><code> private void sendData() throws Exception { DatagramPacket data = new DatagramPacket(outgoingData, outgoingData.length, clientAddress, clientPort); InputStream fis = new FileInputStream(responseData); int a; while((a = fis.read(outgoingData,0,512)) != -1) { data.setLength(a); //'a' is the number of bytes read setLength(int) lets you set the length of bytes you want to sent serverSocket.send(data); Thread.sleep(5); } } </code></pre> <p><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/net/DatagramPacket.html#setLength%28int%29" rel="nofollow">setLength(int) Method DatagramPacket</a> on the receiving end now, you do something like this:</p> <pre><code>byte[]buffer = new byte[512]; DatagramPacket packet = new DatagramPacket(buffer,buffer.length); while(socket.isBound() &amp;&amp; !socket.isClosed()){ socket.receive(packet); system.out.println("Packet Length: "+packet.getLength()); //code here } </code></pre> <p><strong>FIX:</strong> IN Server.java</p> <pre><code>private void sendResponse(String res) throws Exception { if(res.equals("Y")) { // Send ACK -&gt; Send File DatagramPacket x = new DatagramPacket(outgoingData, outgoingData.length, clientAddress, clientPort); serverSocket.send(x); //&lt;&lt;SEND ACK sendData(); } else { String error = "ERROR: The file you requested does not exist."; outgoingData = error.getBytes(); DatagramPacket err = new DatagramPacket(outgoingData, outgoingData.length, clientAddress, clientPort); serverSocket.send(err); } } </code></pre> <p>I noticed your not sending an ack and the client is expecting it, that seems to be your only problem. the first packet currently does nothing for you. now you just need to set the ack packet to what you want. I just sent it while it doesn't contain the string "ERROR" in it.</p>
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    1. POJava reading files via FIO
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    1. COIt is exactly how i have it written apart from sys.out being a output stream. However any block smaller than 512 from what i guess is not being passed.
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    2. COTry printing out `packet.getLength()`, I want to see what it says.
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    3. COSays 512 even tho what it had passed was only about 20 bytes. My code http://www.copypastecode.com/180187/ <- Server http://www.copypastecode.com/180191/ <- Clientode:
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