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09/17/2009 at 04:26PM PDT, ID: 24741867
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9.4

Using Process.waitFor() in Java

Asked by tmitch68 in Java Programming Language

Hello,

I'm writing a Java app in which the code runs an executable, and I keep running into a catch-22.
 
The result of running the executable is that it produces a text file.

My catch-22 problem is in using - or not using - the Process.waitFor() method after running the executable.

If I DON'T put in procwaitFor() (line 3), I get an exeption when I try to read in the file in line 4 - 'The process cannot access the file because it is being used by another process.'

If I DO put in proc.waitFor() (line 3), I can read from the file just fine.  Only problem is,when I try to delete or overwrite the file later on - I get the same problem - 'The file cannot be deleted because it is being used by another process.'

What I don't completely understand is why waitFor() allows you to read from the file - but then won't let you delete or overwite it later.

Here is the code.
Thanks in advance.

1) Runtime rt = Runtime.getRuntime();

2) Process proc = rt.exec(<executable command that produces a text file>);

3) proc.waitFor();  //If this is included, I can't delete or overwrite the file later.  If this is not included, line 4 throws an exception.

4) BufferedReader in = new BufferedReader(new FileReader(<path to file produced>))
[+][-]09/17/09 04:42 PM, ID: 25362140

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Zone: Java Programming Language
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Solution Provided By: CPColin
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Solution Grade: A
 
 
[+][-]09/17/09 04:48 PM, ID: 25362166

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[+][-]09/17/09 05:56 PM, ID: 25362365

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