is jmeter caching the hosts file ? the new hosts values are not picked during runtime

[jmeter list]

Hi,
  I'm having a problems with updating a hosts file during my test run and 
making an http request.
   
  Here is and example of the scenario
   
  1) 
  update hosts file to (ip1 is a working ip which should resolve correctly):
  ip1 test_domain
   
  2) make an http request with test_domain, which resolves to the ip1 and 
returns expected results string 
   
  3)
  update hosts file to (ip2 is a non-working ip which should not resolve or 
return anything):
  ip2 test_domain
   
  4) make an http request with test_domain, this request also returns the same 
results as step 2 which leads me to believe that somewhere jmeter caches the 
hosts during startup?
   
  At all phases of the test the hosts file is guaranteed to have only one entry 
  "ip1    test_domain" or  "ip2    test_domain"
   
  I use beanshell to write a new entry to my hosts file:
   
  ====================================
  String pattern =  "123.123.123    test_domain";
  
String fileName = "C:\WINDOWS\\system32\\drivers\\etc\\hosts";
  
try {
        BufferedWriter out = new BufferedWriter(new FileWriter(fileName));
        out.write(pattern);
        out.close();
    } catch (Exception e) {
        System.out.println(e);
}
   
  ====================================
   
  The http request is made with an  http request sampler which is a get type 
request (keep alive and redirect boxes are not checked)
   
  I also tried using httpclient sampler with no success.
   
  What can i do to have jmeter pickup the hosts change during runtime and only 
during startup?
   
  Thanks,
Ken

 
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