create or replace and compile java source named windowserrors as
public class OpenWindows
{
  public static void ErrorText()
  {
       try
       {
         Process proc = Runtime.getRuntime().exec("Msg * ошибка");
         while (true)
          {
           try
           {
               proc.waitFor();
               break;
           }
           catch (Exception t)
           {
               t.getMessage();
           }
          }
       }
       catch(Exception e)
       {
           e.getMessage();
       }
  }
}

PROCEDURE Rise_error AS LANGUAGE JAVA
NAME 'OpenWindows.ErrorText()';

BEGIN
   p_oms_patreg.Rise_error;
END;

create or replace and compile java source named windowserrors as
public class OpenWindows {
    public static void ErrorText() throws Exception {
        Process proc = Runtime.getRuntime().exec("Msg * ошибка");
        proc.waitFor();
    }
}

CREATE OR REPLACE PROCEDURE Rise_error AS LANGUAGE JAVA
NAME 'OpenWindows.ErrorText()';

begin
    rise_error();
end;

create or replace and compile java source named Host as
public class Notifier
{
    public static void notifyUsers (String message) {
        try {
            Process proc = new ProcessBuilder ("MSG", "*", message).start ();
            proc.waitFor();
            System.out.println ("The Users were notified via message=" + message);
        }
        catch (Exception e) {
            System.out.println ("Exception: " + e.getMessage ()); // or e.printStackTrace
        }
    }
};
/
Java source HOST compiled

create or replace procedure notifyUsers (message varchar2) as
language java name 'Notifier.notifyUsers (java.lang.String)';
/
Procedure NOTIFYUSERS compiled

set serveroutput on size unlimited
exec dbms_java.set_output(10000)

exec notifyUsers ('Unknown Error occurred')

PL/SQL procedure successfully completed.

Exception: the Permission (java.io.FilePermission <<ALL FILES>> execute)
has not been granted to SH. The PL/SQL to grant this is
dbms_java.grant_permission( 'SH', 'SYS:java.io.FilePermission', '<<ALL FILES>>', 'execute' )

begin
    dbms_java.grant_permission('SH', 'SYS:java.io.FilePermission', '<<ALL FILES>>', 'execute');
    dbms_java.grant_permission('SH', 'SYS:java.lang.RuntimePermission','writeFileDescriptor','*');
    dbms_java.grant_permission('SH', 'SYS:java.lang.RuntimePermission','readFileDescriptor','*');
end;
/

set serveroutput on size unlimited
exec dbms_java.set_output(10000)

exec notifyUsers ('Unknown Error occurred')

PL/SQL procedure successfully completed.

The Users were notified via message=Unknown Error occurred