Java Process

[ahsan786]

execProcess = rt.exec("cmd /c C:/prg.exe < C:/in.txt > C:/pout.txt",null, "C:/");
while((System.currentTimeMillis() < (startTime + maxAllowTime))){ //for each test case
try{
if(execProcess.exitValue() == 0){
break;
}else{
break;//terminate the process abnormal???
}
}catch(IllegalThreadStateException itse){ //the process hasn't finished
}
}
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execProcess = rt.exec("cmd /c C:/prg.exe < C:/in.txt > C:/pout.txt",null, "C:/");

Tomcat server is used.
When many clients do the request at the same time the pout.txt files is output empty.
i dont know why?

 

[sedj]

Probably because you are opening many output streams and file handles to that file object, and it is screwing the OS's IO. You should only ever write to a file with once process at a time.

You should either write to different out files, or synchronize the operation within the servlet.

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