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POJava Memory Management with FileChannels
 

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  1. POJava Memory Management with FileChannels
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    <p>I'm using the checkForErrors method shown below to check for errors in a txt file. The method performs an expected, expect that the OS File Handle associated with method parameter f is not being released. This causes a downstream external .exe to fail with the error message "The process cannot access the file because it is being used by another process."</p> <p>Are they any obvious memory management issues that I failed to address?</p> <pre><code>private boolean checkForErrors(File f) { FileInputStream fis = null; FileChannel fc = null; try { if (!f.exists()) { return true; } // get a Channel for the source file fis = new FileInputStream(f); fc = fis.getChannel(); Pattern errorPattern = Pattern.compile("ERROR"); Pattern eoPattern = Pattern.compile("END OF OUTPUT "); // get a CharBuffer from the source file ByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, (int) fc.size()); Charset cs = Charset.forName("8859_1"); CharsetDecoder cd = cs.newDecoder(); CharBuffer cb = cd.decode(bb); // check for the presence of the ERROR keyword Matcher eP = errorPattern.matcher(cb); if (eP.find()) { return true; } // check for the ABSENCE of the end of output keywords Matcher eoP = eoPattern.matcher(cb); if (!eoP.find()) { return true; } } catch (IOException ex) { LOG.log(Level.INFO, null, ex); return true; } finally { try { if (fc != null) { fc.close(); fc = null; } if (fis != null) { fis.close(); fis = null; } } catch (IOException ex) { LOG.log(Level.INFO, null, ex); } } return false; } </code></pre>
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    1. USjavacavaj
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    1. COI could not replicate this on Ubuntu 10.04. Maybe your OS is causing the issue as was suggested [here](http://forums.oracle.com/forums/thread.jspa?threadID=2201775)
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    2. COappears to be related to the use of FileChannel's map method to obtain a memory-mapped byte buffer. Replaced the mapped byte buffer with a start wrapped buffer and the problem went away.
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    3. CO@javacavaj: can you please answer the question yourself and then accept that answer? Also, you need to accept answers to previous questions if they fix your problem.
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      1. USZecas
 

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