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POfile overwrite in java -- user-mapped section open error
 

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  1. POfile overwrite in java -- user-mapped section open error
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    <p>The following function in a java program is written with the intent to read from a file and overwrite back to the same file after.</p> <pre><code>public static void readOverWrite(File dir) throws IOException { for (File f : dir.listFiles()) { String[] data = readFile(f).split("\n"); try (BufferedWriter writer = new BufferedWriter(new FileWriter(f))) { for (int i = 0; i &lt; data.length; i++) { writer.write((data[i]+"\n")); } writer.close(); } } } </code></pre> <p>The error message on trying to run the program is:</p> <pre><code>Exception in thread "main" java.io.FileNotFoundException: ..\..\data\AQtxt\APW19980807.0261.tml (The requested operation cannot be performed on a file with a user-mapped section open) at java.io.FileOutputStream.open(Native Method) at java.io.FileOutputStream.&lt;init&gt;(Unknown Source) at java.io.FileOutputStream.&lt;init&gt;(Unknown Source) at java.io.FileWriter.&lt;init&gt;(Unknown Source) at General.SplitCreationDate.splitLine(SplitCreationDate.java:37) at General.SplitCreationDate.main(SplitCreationDate.java:53) </code></pre> <p>Request help in resolving the error.</p> <hr> <p>Code for readFile</p> <pre><code>protected static String readFile(File fullPath) throws IOException { try(FileInputStream stream = new FileInputStream(fullPath)) { FileChannel fc = stream.getChannel(); MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size()); stream.close(); return Charset.defaultCharset().decode(bb).toString(); } } </code></pre> <hr> <p>Read in another thread that this is a windows issue and so MappedByteBuffer in the readFile method was the cause of the problem. Re-wrote the readFile method as below. It works!</p> <pre><code>protected static String readFile(File fullPath) throws IOException { String string = ""; try (BufferedReader in = new BufferedReader(new FileReader(fullPath))) { String str; while ((str = in.readLine()) != null) { string += str + "\n"; } } return string; } </code></pre>
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    1. USleba-lev
    1. USleba-lev
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      1. POfile overwrite in java -- user-mapped section open error
      1. USJohn Watts
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    1. CODo you have correct file permissions? I've found on goolge a guy that had the same problem but moving to another directory solved it.
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      1. POfile overwrite in java -- user-mapped section open error
      1. USJorge Fuentes González
    2. COCan we see the code for readFile?
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      1. POfile overwrite in java -- user-mapped section open error
      1. USJohn Watts
    3. COThe file permissions seem fine to me, Jorge.
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      1. USleba-lev
 

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