Why would a file rename fail in java
<p>I have the following snippet of java code:</p>

<pre><code>File directoryToMoveTo = new File(file.getParent()+"_TEMP");
boolean success = file.renameTo(new File(directoryToMoveTo,file.getName()));
if (!success){
    logger.warn("Failed to move [%s] to temp Directory.");
}
</code></pre>

<p>file is passed in as an argument to the method and is one of an array of files obtained like this:</p>

<pre><code>File[] files = directory.listFiles(new FilenameFilter() {
    @Override
    public boolean accept(File dir, String name) {
        logger.debug(String.format("Testing file [%s]",name));
        boolean passed = name.endsWith(getFileDescription().getFilePattern());
        logger.debug(String.format("Passed [%s]",passed));
        return passed;
    }
});
</code></pre>

<p>Why would success by false in the first snippet?</p>

<p>I tried this code in isolation on a different file and it seems to work.</p>
