rem create.sql
connect &1/&2
alter java class "Hello" compile;
create or replace package HELLO as
  function WORLD return VARCHAR2;
  pragma restrict_references(WORLD, wnds);
end;
/
create or replace package body HELLO as
  function WORLD return VARCHAR2 as
  language java name 'Hello.world() return java.lang.String';
end;
/

show errors
exit