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POFileNotFound (Access is denied) Exception on java.io
 

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    <p>Why do I get this error when I run this program? This occurs after random iterations. Usually after the 8000th iteration.</p> <pre><code>public static void main(String[] args) { FileWriter writer = null; try { for(int i = 0; i &lt; 10000; i++) { File file = new File("C:\\Users\\varun.achar\\Desktop\\TODO.txt"); if(file.exists()) { System.out.println("File exists"); } writer = new FileWriter(file, true); writer.write(i); System.out.println(i); writer.close(); if(!file.delete()) { System.out.println("unable to delete"); } //Thread.sleep(10); //writer = null; //System.gc(); } } catch(IOException e) { e.printStackTrace(); } finally { if(writer != null) { try { writer.close(); } catch(IOException e) { e.printStackTrace(); } } } } </code></pre> <p>After the exception occurs, the file isn't present. That means the it is deleting, but FIleWriter tries to acquire the lock before that, even though it isn't a multi threaded program. Is it because the Windows isn't deleting the file fast enough, and hence the FileWriter doesn't get a lock? If so, then file.delete() method returns before windows actually deletes it?</p> <p>How do i resolve it, since i'm getting a similar issue during load testing my application.</p> <p>EDIT 1: Stacktrace:</p> <pre><code>java.io.FileNotFoundException: C:\Users\varun.achar\Desktop\TODO.txt (Access is denied) at java.io.FileOutputStream.openAppend(Native Method) at java.io.FileOutputStream.&lt;init&gt;(FileOutputStream.java:192) at java.io.FileOutputStream.&lt;init&gt;(FileOutputStream.java:116) at java.io.FileWriter.&lt;init&gt;(FileWriter.java:61) </code></pre> <p><strong>EDIT 2</strong> : Added file.exists() and file.delete conditions in the program. and the new stacktrace:</p> <pre><code>7452 java.io.FileNotFoundException: C:\Users\varun.achar\Desktop\TODO.txt (Access is denied) at java.io.FileOutputStream.openAppend(Native Method) at java.io.FileOutputStream.&lt;init&gt;(FileOutputStream.java:192) at java.io.FileWriter.&lt;init&gt;(FileWriter.java:90) at com.TestClass.main(TestClass.java:25) </code></pre> <p><strong>EDIT 3</strong> Thread dump</p> <pre><code>TestClass [Java Application] com.TestClass at localhost:57843 Thread [main] (Suspended (exception FileNotFoundException)) FileOutputStream.&lt;init&gt;(File, boolean) line: 192 FileWriter.&lt;init&gt;(File, boolean) line: 90 TestClass.main(String[]) line: 24 C:\Users\varun.achar\Documents\Softwares\Java JDK\JDK 6.26\jdk\jre\bin\javaw.exe (09-Nov-2011 11:57:34 PM) </code></pre> <p><strong>EDIT 4</strong> : Program runs successfully on different machine with same OS. Now how do i ensure that the app with run successfully in the machine it is deployed in?</p>
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    1. COPls. post Stacktrace also.
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    2. COwhat is the exception, also what are you trying to test?
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    3. COThe `Thread.sleep()` seems to help, but i can't put that in the program, otherwise it'll take a century and a half to complete execution. I could try a acquiring lock until it succeeds, but is there a better way?
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