REM Recompile any invalid objects after applying patches.  You can do this from adadmin, or use this script 
REM from Metalink document REL11i ADPATCH BASICS, Doc ID: 181665.1: 
REM Following are examples of the recompile scripts and instructions on implementing 
REM Recompile:

REM Instructions
REM 1.     create recompile and recompile.sql scripts from the above examples.
REM 2.     Modify recompile file, putting the correct address on your system where you are storing recompile.sql
REM 3.     chmod 777 recompile  (or make recompile an executable file)
REM 4.     run recompile
REM        $ recompile [return]
REM sqlplus system/manager 
REM rm -Rf /tmp/recompile_objects.sql

REM recompile_objects.sql
column owner format a1 noprint
column object_name format a1 noprint
column order_col format a1 noprint
column cmd format a132
 
set heading off
set pagesize 0
set linesize 180
set echo off
set feedback off
 
spool recompile_objects_sql.sql
 
select 'set echo on' from dual;
select 'spool recompile_objects.lis' from dual;
 
select distinct 'alter session set current_schema=' || owner || ';' cmd,
    owner, 1 order_col, NULL object_name
from dba_objects
where status = 'INVALID'
  and object_type in ('PACKAGE','PACKAGE BODY','VIEW','PROCEDURE',
                      'FUNCTION','TRIGGER','TYPE','TYPE BODY','INDEXTYPE',
                      'JAVA CLASS')
union
select 'ALTER ' ||
    decode(object_type, 'PACKAGE BODY', 'PACKAGE', 'TYPE BODY', 'TYPE',
    object_type) || ' ' || owner || '.' || '"' || object_name || '"' || ' COMPILE' ||
    decode(object_type, 'PACKAGE BODY', ' BODY', 'TYPE BODY', ' BODY', '') ||
    ';' cmd, owner,2 order_col, object_name
from dba_objects outer
where status = 'INVALID'
  and object_type in ('PACKAGE','PACKAGE BODY','VIEW','PROCEDURE',
                      'FUNCTION','TRIGGER','TYPE','TYPE BODY','INDEXTYPE',
                      'JAVA CLASS')
  and (object_type <> 'PACKAGE BODY'
       or not exists
             (select null
              from dba_objects
              where owner = outer.owner
                and object_name = outer.object_name
                and object_type = 'PACKAGE'
                and status = 'INVALID'))
  and (object_type <> 'TYPE BODY'
       or not exists
             (select null
              from dba_objects
              where owner = outer.owner
                and object_name = outer.object_name
                and object_type = 'TYPE'
                and status = 'INVALID'))
order by 2,3,4
/
 
select 'exit;' from dual;
spool off;
 
set heading on
set feedback on
set pagesize 9999
set linesize 80
 
@recompile_objects_sql.sql