using java language in as/400

Question 1:
i am trying to open cash drawer using java code with the help of batch file Serial2.bat.

Serial2.bat
MODE COM1 96,N,8,1
ECHO ^G>COM1

Java program in As/400
PUBLIC CLASS TEST {                                          
  PUBLIC STATIC VOID MAIN(STRING[] ARGS) THROWS EXCEPTION {  
    PROCESS P = RUNTIME.GETRUNTIME().EXEC(                  
         "C:\WINDOWS\Serial2.bat");                              
    P.WAITFOR();                                            
  }                                                          
}          

while running this java program it is giving error java.io.IOException: the path is not found.
Is there any way to access the batch file in the C: drive using java program in AS/400.

Question2:
I have tried through CL language using STRPCCMD with the help of batch file serial2.bat it is opening the cash drawer but Dos prompt is displaying in AS/400 screen.  But i don't want to display the dos prompt.  

the aim is to open cash drawer without displaying the Dos prompt in AS/400 screen.
                                       


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