SQL & PL/SQL

CREATE OR REPLACE procedure testblobwrite as
  l_header     raw(32767);
  lengte       integer;
  v_blob2      BLOB;
begin
  l_header := utl_raw.cast_to_raw('hallo.txt' || chr(0));
  lengte := length(l_header);
  dbms_lob.createtemporary(v_blob2, TRUE, dbms_lob.session);
  dbms_lob.open(v_blob2, dbms_lob.lob_readwrite);

  dbms_lob.write(v_blob2, lengte, 1, l_header);
end;
/

begin
  testblobwrite;
end;
ORA-21560: argument 2 is null, invalid, or out of range
ORA-06512: at "SYS.DBMS_LOB", line 811
ORA-06512: at "RIGHTSHOP.TESTBLOBWRITE", line 11
ORA-06512: at line 2