CreateProcess error 2 The system cannot find the file specified

Question

I am writing a program in java which would execute winrar and unzip a jar file for me placed in h  myjar jar into the folder h  new  My java code goes something like this  import java io File  import java io IOException   public class MainClass        public static void main String   args             Runtime r   Runtime getRuntime            Process p   null           try               File dir   new File  C  Program Files WinRAR                p   r exec  winrar x h   myjar jar     h   new   null  dir             catch  IOException e                e printStackTrace                        When I execute this  I am getting this error  java io IOException  Cannot run program  winrar   in directory  C  Program Files WinRAR    CreateProcess error 2  The system cannot find the file specified     at java lang ProcessBuilder start Unknown Source      at java lang Runtime exec Unknown Source      at java lang Runtime exec Unknown Source      at MainClass main MainClass java 16  Caused by  java io IOException  CreateProcess error 2  The system cannot find the file specified     at java lang ProcessImpl create Native Method      at java lang ProcessImpl  lt init gt  Unknown Source      at java lang ProcessImpl start Unknown Source          4 more   Can anyone tell me why am I encountering such a problem  What is the change I need to incorporate in code so that it works

User · Answer

I used ProcessBuilder but had the same issue. The issue was with using command as one String line (like I would type it in cmd) instead of String array. In example from above. If I ran

ProcessBuilder pb = new ProcessBuilder("C:/Program Files/WinRAR/winrar x myjar.jar *.* new");
pb.directory(new File("H:/"));
pb. redirectErrorStream(true);

Process p = pb.start();

I got an error. But if I ran

ProcessBuilder pb = new ProcessBuilder("C:/Program Files/WinRAR/winrar", "x", "myjar.jar", "*.*", "new");
pb.directory(new File("H:/"));
pb. redirectErrorStream(true);

Process p = pb.start();

everything was OK.

User · Answer

My recomendation is to keep the getRuntime   exec because exec uses the ProcessBuilder   Try   p r exec new String     winrar    x    h   myjar jar           h   new    null  dir

User · Answer

The complete first argument of exec is being interpreted as the executable  Use  p   rt exec new String     winrar exe    x    h   myjar jar           h   new                null               dir

User · Answer

The dir you specified is a working directory of running process - it doesn t help to find executable  Use cmd  c winrar     to run process looking for executable in PATH or try to use absolute path to winrar

User · Answer

Assuming that winrar exe is in the PATH  then Runtime exec is capable of finding it  if it is not  you will need to supply the fully qualified path to it  for example  assuming winrar exe is installed in C  Program Files WinRAR you would need to use something like     p r exec  C  Program Files WinRAR winrar x h   myjar jar     h   new      Personally  I would recommend that you use ProcessBuilder as it has some additional configuration abilities amongst other things   Where possible  you should also separate your command and parameters into separate String elements  it deals with things like spaces much better then a single String variable  for example     ProcessBuilder pb   new ProcessBuilder       C  Program Files WinRAR winrar        x        myjar jar                   new    pb directory new File  H       pb  redirectErrorStream true    Process p   pb start      Don t forget to read the contents of the InputStream from the process  as failing to do so may stall the process

[java] CreateProcess error=2, The system cannot find the file specified

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