Calling Stored procedures

I am trying to create my first stored procedure(which I have done), but
now I am trying to use it in java.  I am getting an error on the last
statement which is "An undefined column name was detected".

Can anyone see anything that I am doing wrong?  

  DriverManager.registerDriver(new
com.ibm.as400.access.AS400JDBCDriver());
Connection myConnection =
DriverManager.getConnection("jdbc:as400://S104M74M","","");
  Statement myStatement = myConnection.createStatement();
  String SQLString = new String("{CALL SBGDTATEST.TEST}");
  CallableStatement cs = myConnection.prepareCall(SQLString);   
  cs.execute();
String Column = new String("CUSTOMER_NAME");  
System.out.println( "Got from stored procedure: " + cs.getString(Column)
);

Could it be something in my stored procedure?  I wanted to try something
easy so I only selected two columns in my stored procedure and without
any parameters.  Here is how I created it:

CREATE PROCEDURE SBGDTATEST.TEST ( ) 
        LANGUAGE SQL 
        SPECIFIC SBGDTATEST.TEST 
        NOT DETERMINISTIC 
        READS SQL DATA 
        CALLED ON NULL INPUT 

        BEGIN 
        DECLARE VAR1 CHAR ; 
        DECLARE VAR2 CHAR ; 
        SELECT CUSTOMER_NUMBER, CUSTOMER_NAME INTO VAR1, VAR2 FROM
SBGDTATEST.CUSTOMER_MASTER ; 

        END  ; 

I would appreciate any suggestions.

Thanks,

Curt VanCalster
Lead Programmer
Smithfield Beef Group., - Green Bay, WI
(920) 406-1174
curt.vancalster@xxxxxxxxxx