Rem create.sql
connect &1/&2

create or replace package empbyref as 
  function getemp (empno in number) return number;
  function empsal (empid in number) return number;
  procedure raiseemp (empid in number, percent in number);
  procedure updateemp (empid in number);
end;
/

show errors

create or replace package body empbyref as 
  function getemp (empno in number) return number
    as language java name 
       'EmployeeByRef.getEmployee (java.lang.Integer) return java.lang.Integer';

  function empsal (empid in number) return number
    as language java name 
       'EmployeeByRef.employeeSalary (java.lang.Integer) return java.lang.Integer';

  procedure raiseemp (empid in number, percent in number)
    as language java name 
       'EmployeeByRef.raiseEmployee (java.lang.Integer, float)';

  procedure updateemp (empid in number)
    as language java name 
       'EmployeeByRef.updateEmployee (java.lang.Integer)';
end;
/

show errors
exit