Tomcat - HTTP Status 500 - System Unavailable. Please try again later.

Question

HI,
I installed ORACLE XE + TOMCAT 7 + ORACLE XE on windows XP.
All seems to work under debug session but on normal session I found the following message only when I put a specific parameter on my query.
The same query with the same parameter runs in the sqldev client whitout errors
Here below the massages:
HTTP Status 500 - System Unavailable. Please try again later.
type Status report
message System Unavailable. Please try again later.
description The server encountered an internal error (System Unavailable. Please try again later.) that prevented it from fulfilling this request.
Apache Tomcat/7.0.2
and in the log file:
2011-02-23 18:04:19 Commons Daemon procrun stdout initialized
APEX Listener version : 1.0.2.238.15.24
APEX Listener server info: Apache Tomcat/7.0.2
Using Config file:C:\Programmi\Apache Software Foundation\Tomcat 7.0\temp\apex\apex-config.xml
-- listing properties --
PropertyCheckInterval=60
ValidateConnection=true
MinLimit=1
MaxLimit=10
InitialLimit=3
AbandonedConnectionTimeout=900
MaxStatementsLimit=10
InactivityTimeout=1800
MaxConnectionReuseCount=50000
***********ERROR***********
init: # headers=46
declare nm owa.vc_arr := ?;
     vl owa.vc_arr := ?;
begin
owa.init_cgi_env( ?, nm, vl );
htp.init; htp.HTBUF_LEN := 63;
? := sys_context('USERENV','SID');
end;
SID:18
CALL:
begin
f(p=>?);
commit;
end;
BINDS
p:106:3:4503262208013405:::::PAGE CALL:
declare
nlns number := 999999;
l_clob CLOB;
lines htp.htbuf_arr;
l_buff varchar2(32767);
l_clob_init boolean:= false;
l_file varchar2(5);
begin
OWA.GET_PAGE(lines, nlns);
if (nlns > 1) then
for i in 1..nlns loop
if ( length(lines(i)) > 0 ) then
if ( ( lengthb(l_buff) + lengthb(lines(i))) > 32767) then
               if (NOT l_clob_init) then
                    dbms_lob.createtemporary(l_clob, TRUE);
                    dbms_lob.open(l_clob, dbms_lob.lob_readwrite);
                    l_clob_init:=true;
               end if;
dbms_lob.writeappend(l_clob,length(l_buff),l_buff);
l_buff := lines(i);
else
l_buff := l_buff || lines(i);
end if;
end if;
end loop;
end if;
if (l_clob_init) then
dbms_lob.writeappend(l_clob,length(l_buff),l_buff);
l_buff := '';
end if;
? := l_clob;
? := l_buff;
if (wpg_docload.is_file_download) then l_file:='TRUE'; else l_file := 'FALSE'; end if; ? := l_file;
end;
get_page FAILED:ORA-06502: PL/SQL: errore : buffer della stringa di caratteri troppo piccolo di numero o valore
ORA-06512: a line 32
^^^^^^^^^^^^ERROR^^^^^^^^
ORA-06502: PL/SQL: errore : buffer della stringa di caratteri troppo piccolo di numero o valore
ORA-06512: a line 32
***********ERROR***********
init: # headers=46
declare nm owa.vc_arr := ?;
     vl owa.vc_arr := ?;
begin
owa.init_cgi_env( ?, nm, vl );
htp.init; htp.HTBUF_LEN := 63;
? := sys_context('USERENV','SID');
end;
SID:18
CALL:
begin
f(p=>?);
commit;
end;
BINDS
p:106:3:3777982020408238:::::PAGE CALL:
declare
nlns number := 999999;
l_clob CLOB;
lines htp.htbuf_arr;
l_buff varchar2(32767);
l_clob_init boolean:= false;
l_file varchar2(5);
begin
OWA.GET_PAGE(lines, nlns);
if (nlns > 1) then
for i in 1..nlns loop
if ( length(lines(i)) > 0 ) then
if ( ( lengthb(l_buff) + lengthb(lines(i))) > 32767) then
               if (NOT l_clob_init) then
                    dbms_lob.createtemporary(l_clob, TRUE);
                    dbms_lob.open(l_clob, dbms_lob.lob_readwrite);
                    l_clob_init:=true;
               end if;
dbms_lob.writeappend(l_clob,length(l_buff),l_buff);
l_buff := lines(i);
else
l_buff := l_buff || lines(i);
end if;
end if;
end loop;
end if;
if (l_clob_init) then
dbms_lob.writeappend(l_clob,length(l_buff),l_buff);
l_buff := '';
end if;
? := l_clob;
? := l_buff;
if (wpg_docload.is_file_download) then l_file:='TRUE'; else l_file := 'FALSE'; end if; ? := l_file;
end;
get_page FAILED:ORA-06502: PL/SQL: errore : buffer della stringa di caratteri troppo piccolo di numero o valore
ORA-06512: a line 32
^^^^^^^^^^^^ERROR^^^^^^^^
ORA-06502: PL/SQL: errore : buffer della stringa di caratteri troppo piccolo di numero o valore
ORA-06512: a line 32
Could you kindly help me.
Thanks in advance for your help
Best Regards

Answer 1

Hi Paolo,
which APEX version do you use?
There are only a few reasons that might lead to the behaviour you describe. These are
- configured header size for Tomcat Connector is too small
- configured character encoding for Tomcat Connector doesn't fit for APEX (you need UTF-8)
- you don't have the required version of OWA_UTIL in your XE if you upgraded to a more recent APEX release (e.g. APEX 4.0)
Have you configured the Tomcat's HTTP Connector to use the appropriate header size and character encoding?
(see {thread:id=2174509})
If you've upgraded your XEs APEX, e.g. to 4.0, you also have to update the OWA_UTIL in your XE. APEX versions from 3.0 onwards require at least 10.1.2.0.6, which is the version provided in the installation package. You may just update to that version by changing to the subdirectory owa of your APEX installation package and running
@owainst.sqlas sys (just like in the steps before).
You can check if you have the appropriate version of OWA_UTIL installed by running
select owa_util.get_version from dual;In addition you may also want to check if you performed all steps of this small [url http://www.oracle.com/technetwork/developer-tools/apex/upgrade-apex-for-xe-154969.html]HowTo for the upgrade of APEX in XE databases.
-Udo