java.io.IOException: error=2, No such file or directory

[NARs]

hello :
I'm trying to execute command (//root//Cexe//test) from java application but get the error msg :

java.io.IOException: Cannot run program "//root//Cexe//test": java.io.IOException: error=2, No such file or directory

but i can execute the command //root//Cexe//test from command line window , it's my part of code :

String filename="result";
      BufferedWriter bw = new BufferedWriter(new FileWriter(filename));
      Datum datum = null;
      
      String[] cmd={"sudo //root//Cexe//test ",id1};
      
      Process p =null;
      try{
      ProcessBuilder pb = new ProcessBuilder(cmd);
       p = pb.start();
      }
      catch (Exception e)
      {
      bw.write(e.toString()+'\n');  
      bw.write("startprocess----");
      bw.write(cmd[0]);
      bw.write(cmd[1]);
      bw.flush();
      bw.close();
      }

Any idea why?

thanks in advance,

[JosAH]

Why are you using double slashes? Only backslashes need to be escaped by another backslash.

kind regards,

Jos

[NARs]

Why are you using double slashes? Only backslashes need to be escaped by another backslash.

kind regards,

Jos

hi Jos :
but when i modify the cmd as follows
String[] cmd={"sudo /root/Cexe//test ",id1};

the same error msg again !

[JosAH]

I can still see a double slash character there; but what if the sudo command requires a password? I don't see your code supplying one ...

kind regards,

Jos

[NARs]

hi Jos :
these if part of my code, i have check the cmd array have save my command (/root/progdir/test arg1)

try{
      String filename="result";
      BufferedWriter bw = new BufferedWriter(new FileWriter(filename));
      Datum datum = null;
      String path ="/root/progdir/test  ";
      String[] cmd={path,arg1};
      bw.write(cmd[0]);  //command 
      bw.write(cmd[1]);
      
      try{
        
             ProcessBuilder pb = new ProcessBuilder(cmd);
                 p = pb.start();
              
          
          bw.flush();
          bw.close();
 
      }
      catch (Exception e)
      {
      bw.write(e.toString()+'\n');  
      bw.write("startprocess----");
      bw.write(cmd[0]);
      bw.write(cmd[1]);
      bw.flush();
      bw.close();
      }

but still can't execute the command using ProcessBuilder .
Any idea will be appreciated!
cheers ,

[JosAH]

Don't use trailing spaces in your path or any of the argument parameters. Read the API documentation for the Process class or any of the Runtime.exec( ... ) methods.

kind regards,

Jos