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    <p>You're trying to read and write to the same file at the same time. While there may be a way of getting that to work, it's going to be fiddly.</p> <p>I suggest you read from file A and write to file B - and if you want to effectively replace the input file, then you can do that with a sequence of moves and deletes at the end.</p> <p>A few other suggestions:</p> <ul> <li>You should have try/finally blocks to close both the input and the output at the end.</li> <li>You don't need to use a <code>DataInputStream</code> - you're not using anything from it. Just wrap the input stream directly.</li> <li>I suggest you specify the encoding explicitly both for input and output rather than trusting the default encoding. (I wish <code>FileWriter</code> and <code>FileReader</code> accepted encodings in their constructors.)</li> <li>It's more robust to use <code>OutputStreamWriter</code> (or something similar) rather than <code>PrintWriter</code> - currently you're not going to detect if anything goes wrong when you're writing.</li> </ul> <p>So something like this:</p> <pre><code>// Ideally have this as a constant somewhere. Charset utf8 = Charset.forName("UTF-8"); BufferedReader reader = new BufferedReader(new InputStreamReader( new FileInputStream(inputFile), utf8); try { try { BufferedWriter writer = new BufferedWriter(new OutputStreamWriter( new FileOutputStream(outputFile), utf8); String line; while ((line = reader.readLine()) != null) { if (!line.contains(name)) { writer.write(line); writer.newLine(); } } } finally { writer.close(); } } finally { reader.close(); } // Now if you want to shift files around, do it here </code></pre> <p>It's a shame that Java makes this so fiddly with the try/finally blocks. Oh for C#'s <code>using</code> statements...</p>
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