ORA-29532 when executing java source stored procedure

Hello,

we are using Oracle 12.1.0.2.0 database on Windows 2016 64 bit. We have following java source:

CREATE OR REPLACE AND COMPILE JAVA SOURCE NAMED Command 

AS

import java.io.*;

import java.util.*;

public class Command{

public static void run(String cmdText) 

           throws IOException, InterruptedException

{

 int rtn;

    Runtime rt = Runtime.getRuntime();

 Process prcs = rt.exec(cmdText);

 rtn = prcs.waitFor();

}

};

and following stored procedure:

CREATE OR REPLACE PROCEDURE runoscommand(cmd IN VARCHAR2)

AS LANGUAGE JAVA

NAME 'Command.run(java.lang.String)';

/

Occasionally the following error happens when executing "runoscommand":

ORA-29532: Java call terminated by uncaught Java exception: java.io.IOException: Cannot run program....