Java Stored Procedure em Oracle

begin
        dbms_java.grant_permission
        ('ICD',
         'java.io.FilePermission',
         '/usr/bin/ps',
         'execute');

        dbms_java.grant_permission
        ('ICD',
        'java.lang.RuntimePermission',
        '*',
        'writeFileDescriptor' );
end;
/

create or replace and compile
   java source named "Util"
   as
   import java.io.*;
   import java.lang.*;

   public class Util extends Object {
     public static int RunThis(String[] args) {
     Runtime rt = Runtime.getRuntime();
     int        rc = -1;
     try {
        Process p = rt.exec(args[0]);

        int bufSize = 4096;
        BufferedInputStream bis =
         new BufferedInputStream(p.getInputStream(), bufSize);
        int len;
        byte buffer[] = new byte[bufSize];

        // Echo back what the program spit out
        while ((len = bis.read(buffer, 0, bufSize)) != -1)
           System.out.write(buffer, 0, len);

        rc = p.waitFor();
     }
     catch (Exception e) {
        e.printStackTrace();
        rc = -1;
     }
     finally {
        return rc;
     }
     }
   }
/

create or replace
    function RUN_CMD( p_cmd  in varchar2) return number
    as
    language java
    name 'Util.RunThis(java.lang.String[]) return integer';
/

create or replace procedure RC(p_cmd in varchar2)
    as
      x number;
    begin
      x := run_cmd(p_cmd);
    end;
/

set serveroutput on size 1000000
exec dbms_java.set_output(1000000)
exec rc('/usr/bin/pwd');