Re: Fwd: tomcat 9.50 - rewrite rule question

[Rob Sargent]

On 3/24/22 13:27, Peter Chiu wrote:

Application builder->Your application->Shared Components->Application
Definition Attributes->Properties->Friendly URLs



And that does what, exactly?


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Re: Fwd: tomcat 9.50 - rewrite rule question

[Peter Chiu]

Application builder->Your application->Shared Components->Application
Definition Attributes->Properties->Friendly URLs

On Thu, Mar 24, 2022 at 3:25 PM rupali singh 
wrote:

> Hi,
>
> How we can enable friendly url in apex?
>
>
>
> On Fri, Mar 25, 2022, 12:48 AM Peter Chiu  wrote:
>
> > Have you consider doing the following
> > 1. custom URL/domain, and
> > 2. enable Friendly URLs in APEX
> >
> > On Thu, Mar 24, 2022 at 3:09 PM Felix Schumacher <
> > felix.schumac...@internetallee.de> wrote:
> >
> > >
> > > Am 24.03.22 um 19:23 schrieb rupali singh:
> > >
> > > hi,
> > >
> > > yes context name is apex.
> > >
> > > Good to know.
> > >
> > >  https://xyz.ae/apex/f?p=1001  <
> > https://xyz.com/apex/f?p=1001>   tohttps://xyz.ae/apex/myapp <
> > https://xyz.com/aorx/myapp> 
> > >
> > > we dont want to change xyz.ae that will name remain as it is , we want
> > to
> > > change f?p=1001  <
> > https://xyz.com/apex/f?p=1001> to myapp
> > >
> > > Sorry, I don't understand, what you meant by the above.
> > >
> > > I suspect, that you wanted to show, what the user enters into the
> browser
> > > and where the application listens. But it doesn't really makes sense to
> > me.
> > >
> > > Reading your first mail again, I think, that you have a loadbalancer
> that
> > > listens on xyz.ae and that proxies to xyz.com (you mentioned port
> 8080,
> > > which is left out in all your examples). Is that right?
> > >
> > > Apart from that, I wanted to know, what you tried on a technical level.
> > > Have you tried the curl command that I gave as an example?
> > >
> > > Felix
> > >
> > > On Wed, 23 Mar 2022 at 19:23, Felix Schumacher <
> > felix.schumac...@internetallee.de> wrote:
> > >
> > >
> > > Am 23. März 2022 12:14:25 MEZ schrieb rupali singh <
> > rupali.r.si...@gmail.com>:
> > >
> > > Hi Chris,
> > >
> > > I already tried with fully qualified name but its not working
> > >
> > > Can you be more specific, what you tried?
> > >
> > > Is Chris right and your context name is apex?
> > >
> > > Felix
> > >
> > > On Tue, Mar 22, 2022, 7:15 PM Christopher Schultz <
> > ch...@christopherschultz.net> wrote:
> > >
> > >
> > > All,
> > >
> > > On 3/21/22 10:19, Felix Schumacher wrote:
> > >
> > > Am 21.03.22 um 06:39 schrieb rupali singh:
> > >
> > > Hi Felix,
> > >
> > > location of context.xml file is
> > >
> > >   cat context.xml| grep RewriteValve
> > >   > >
> > > className="org.apache.catalina.valves.rewrite.RewriteValve"
> > >
> > > />
> > >
> > >   pwd
> > > /opt/tomcat/apache-tomcat-9.0.54/instance/conf
> > >
> > > That context.xml is thought to be a default template for all installed
> > > webapps. It will work, but remember, that every installed webapp will
> > > get its own copy of a rewrite valve.
> > >
> > > +1
> > >
> > > This is probably the problem.
> > >
> > >
> > > more
> > >
> > >
> > >
> >
> /opt/tomcat/apache-tomcat-9.0.54/instance/webapps/ROOT/WEB-INF/rewrite.config
> > >
> > > RewriteCond %{QUERY_STRING} p=10001
> > > RewriteRule ^/apex/f$ /apex/myapp [R,L]
> > >
> > > I think you want:
> > >
> > > RewriteCond %{QUERY_STRING} p=10001
> > > RewriteRule ^/f$ /myapp [R,L]
> > >
> > > The prefix /apex is already a part of the context-path and should be
> > > removed from the URL patterns being matched. If you want to redirect to
> > > another web application, you need a fully-qualified redirect like this:
> > >
> > > RewriteCond %{QUERY_STRING} p=10001
> > > RewriteRule ^/f$ https://www.google.com/ [R,L]
> > >
> > > -chris
> > >
> > > -
> > > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> > > For additional commands, e-mail: users-h...@tomcat.apache.org
> > >
> > >  -
> > > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> > > For additional commands, e-mail: users-h...@tomcat.apache.org
> > >
> > >
> >
>

Re: AW: Maybe a stupid (Windows related) question

[Rony G. Flatscher (Apache)]

Hi Konstantin,

On 23.03.2022 23:29, Konstantin Kolinko wrote:
> ср, 23 мар. 2022 г. в 14:12, Rony G. Flatscher (Apache) :
>> skip...
>>
>> startup.bat uses start to run catalina.bat in a new cmd window with:
>>
>> call "%EXECUTABLE%" start %CMD_LINE_ARGS%
>>
>> catalina.bat then starts Tomcat as:
>>
>> %_EXECJAVA% %CATALINA_LOGGING_CONFIG% %LOGGING_MANAGER% %JAVA_OPTS% 
>> %CATALINA_OPTS% %DEBUG_OPTS%
>> -D%ENDORSED_PROP%="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%"
>> -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%"
>> -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% 2>&1 1>
>> D:\orx.debug\work_rii_tomcat\test.log
>>
>> This does not work.
> (It does not matter, but you somehow lost "%ACTION%" at the end of the
> above line.)
>
> If I prefix the above line with "echo" to see what command is being
> executed, like this:
>
> echo %_EXECJAVA% %CATALINA_LOGGING_CONFIG% %LOGGING_MANAGER%
> %JAVA_OPTS% %CATALINA_OPTS% %DEBUG_OPTS%
> -D%ENDORSED_PROP%="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%"
> -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%"
> -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS%
> %ACTION% 1>>mylog.txt 2>&1
>
> then I get the following results:
>
> a) After calling "startup.bat" or "catalina.bat start" I see the
> following in mylog.txt:
>
> start "Tomcat" "C:\pathtojava\java.exe" .
> org.apache.catalina.startup.Bootstrap start
>
> b) After calling "catalina.bat run" I see the following:
>
> "C:\pathtojava\java.exe" . org.apache.catalina.startup.Bootstrap start
>
> Note the difference.
>
> It is the "start" command that creates a new window.  The "call"
> command that you mentioned is just a command to execute a different
> batch file and return to continue executing the original batch file.
>
> BTW, commands "help start" and "help call" print some reference for
> those commands.
>
>
> Looking at the reference for "start", I think your only option is to
> use "catalina.bat run" to start Tomcat. When I do so, the redirection
> works as expected.
>
>
> The following also works, without any modifications to the catalina.bat file:
>
> catalina.bat run 1>>mylog.txt 2>&1
>
> or with remote debugging being enabled:
>
> catalina.bat jpda run 1>>mylog.txt 2>&1

thank you very much for your information and explanations which solves this, 
many thanks!

(Was not aware of "catalina.bat run" and the like, adding to that your 
step-by-step explanations
made it a breeze to get this up and running as a result!)

Kudos!

---rony



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Re: Fwd: tomcat 9.50 - rewrite rule question

[rupali singh]

Hi,

How we can enable friendly url in apex?



On Fri, Mar 25, 2022, 12:48 AM Peter Chiu  wrote:

> Have you consider doing the following
> 1. custom URL/domain, and
> 2. enable Friendly URLs in APEX
>
> On Thu, Mar 24, 2022 at 3:09 PM Felix Schumacher <
> felix.schumac...@internetallee.de> wrote:
>
> >
> > Am 24.03.22 um 19:23 schrieb rupali singh:
> >
> > hi,
> >
> > yes context name is apex.
> >
> > Good to know.
> >
> >  https://xyz.ae/apex/f?p=1001  <
> https://xyz.com/apex/f?p=1001>   tohttps://xyz.ae/apex/myapp <
> https://xyz.com/aorx/myapp> 
> >
> > we dont want to change xyz.ae that will name remain as it is , we want
> to
> > change f?p=1001  <
> https://xyz.com/apex/f?p=1001> to myapp
> >
> > Sorry, I don't understand, what you meant by the above.
> >
> > I suspect, that you wanted to show, what the user enters into the browser
> > and where the application listens. But it doesn't really makes sense to
> me.
> >
> > Reading your first mail again, I think, that you have a loadbalancer that
> > listens on xyz.ae and that proxies to xyz.com (you mentioned port 8080,
> > which is left out in all your examples). Is that right?
> >
> > Apart from that, I wanted to know, what you tried on a technical level.
> > Have you tried the curl command that I gave as an example?
> >
> > Felix
> >
> > On Wed, 23 Mar 2022 at 19:23, Felix Schumacher <
> felix.schumac...@internetallee.de> wrote:
> >
> >
> > Am 23. März 2022 12:14:25 MEZ schrieb rupali singh <
> rupali.r.si...@gmail.com>:
> >
> > Hi Chris,
> >
> > I already tried with fully qualified name but its not working
> >
> > Can you be more specific, what you tried?
> >
> > Is Chris right and your context name is apex?
> >
> > Felix
> >
> > On Tue, Mar 22, 2022, 7:15 PM Christopher Schultz <
> ch...@christopherschultz.net> wrote:
> >
> >
> > All,
> >
> > On 3/21/22 10:19, Felix Schumacher wrote:
> >
> > Am 21.03.22 um 06:39 schrieb rupali singh:
> >
> > Hi Felix,
> >
> > location of context.xml file is
> >
> >   cat context.xml| grep RewriteValve
> >   >
> > className="org.apache.catalina.valves.rewrite.RewriteValve"
> >
> > />
> >
> >   pwd
> > /opt/tomcat/apache-tomcat-9.0.54/instance/conf
> >
> > That context.xml is thought to be a default template for all installed
> > webapps. It will work, but remember, that every installed webapp will
> > get its own copy of a rewrite valve.
> >
> > +1
> >
> > This is probably the problem.
> >
> >
> > more
> >
> >
> >
> /opt/tomcat/apache-tomcat-9.0.54/instance/webapps/ROOT/WEB-INF/rewrite.config
> >
> > RewriteCond %{QUERY_STRING} p=10001
> > RewriteRule ^/apex/f$ /apex/myapp [R,L]
> >
> > I think you want:
> >
> > RewriteCond %{QUERY_STRING} p=10001
> > RewriteRule ^/f$ /myapp [R,L]
> >
> > The prefix /apex is already a part of the context-path and should be
> > removed from the URL patterns being matched. If you want to redirect to
> > another web application, you need a fully-qualified redirect like this:
> >
> > RewriteCond %{QUERY_STRING} p=10001
> > RewriteRule ^/f$ https://www.google.com/ [R,L]
> >
> > -chris
> >
> > -
> > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> > For additional commands, e-mail: users-h...@tomcat.apache.org
> >
> >  -
> > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> > For additional commands, e-mail: users-h...@tomcat.apache.org
> >
> >
>

Re: Fwd: tomcat 9.50 - rewrite rule question

[Peter Chiu]

Have you consider doing the following
1. custom URL/domain, and
2. enable Friendly URLs in APEX

On Thu, Mar 24, 2022 at 3:09 PM Felix Schumacher <
felix.schumac...@internetallee.de> wrote:

>
> Am 24.03.22 um 19:23 schrieb rupali singh:
>
> hi,
>
> yes context name is apex.
>
> Good to know.
>
>  https://xyz.ae/apex/f?p=1001  
>    tohttps://xyz.ae/apex/myapp 
>  
>
> we dont want to change xyz.ae that will name remain as it is , we want to
> change f?p=1001  
>  to myapp
>
> Sorry, I don't understand, what you meant by the above.
>
> I suspect, that you wanted to show, what the user enters into the browser
> and where the application listens. But it doesn't really makes sense to me.
>
> Reading your first mail again, I think, that you have a loadbalancer that
> listens on xyz.ae and that proxies to xyz.com (you mentioned port 8080,
> which is left out in all your examples). Is that right?
>
> Apart from that, I wanted to know, what you tried on a technical level.
> Have you tried the curl command that I gave as an example?
>
> Felix
>
> On Wed, 23 Mar 2022 at 19:23, Felix Schumacher 
>  wrote:
>
>
> Am 23. März 2022 12:14:25 MEZ schrieb rupali singh :
>
> Hi Chris,
>
> I already tried with fully qualified name but its not working
>
> Can you be more specific, what you tried?
>
> Is Chris right and your context name is apex?
>
> Felix
>
> On Tue, Mar 22, 2022, 7:15 PM Christopher Schultz 
>  wrote:
>
>
> All,
>
> On 3/21/22 10:19, Felix Schumacher wrote:
>
> Am 21.03.22 um 06:39 schrieb rupali singh:
>
> Hi Felix,
>
> location of context.xml file is
>
>   cat context.xml| grep RewriteValve
>  
> className="org.apache.catalina.valves.rewrite.RewriteValve"
>
> />
>
>   pwd
> /opt/tomcat/apache-tomcat-9.0.54/instance/conf
>
> That context.xml is thought to be a default template for all installed
> webapps. It will work, but remember, that every installed webapp will
> get its own copy of a rewrite valve.
>
> +1
>
> This is probably the problem.
>
>
> more
>
>
> /opt/tomcat/apache-tomcat-9.0.54/instance/webapps/ROOT/WEB-INF/rewrite.config
>
> RewriteCond %{QUERY_STRING} p=10001
> RewriteRule ^/apex/f$ /apex/myapp [R,L]
>
> I think you want:
>
> RewriteCond %{QUERY_STRING} p=10001
> RewriteRule ^/f$ /myapp [R,L]
>
> The prefix /apex is already a part of the context-path and should be
> removed from the URL patterns being matched. If you want to redirect to
> another web application, you need a fully-qualified redirect like this:
>
> RewriteCond %{QUERY_STRING} p=10001
> RewriteRule ^/f$ https://www.google.com/ [R,L]
>
> -chris
>
> -
> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> For additional commands, e-mail: users-h...@tomcat.apache.org
>
>  -
> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> For additional commands, e-mail: users-h...@tomcat.apache.org
>
>

Re: Fwd: tomcat 9.50 - rewrite rule question

[Felix Schumacher]

Am 24.03.22 um 19:23 schrieb rupali singh:

hi,

yes context name is apex.

Good to know.


  https://xyz.ae/apex/f?p=1001  to
https://xyz.ae/apex/myapp  

we dont want to change xyz.ae that will name remain as it is , we want to
change f?p=1001  to myapp


Sorry, I don't understand, what you meant by the above.

I suspect, that you wanted to show, what the user enters into the 
browser and where the application listens. But it doesn't really makes 
sense to me.


Reading your first mail again, I think, that you have a loadbalancer 
that listens on xyz.ae and that proxies to xyz.com (you mentioned port 
8080, which is left out in all your examples). Is that right?


Apart from that, I wanted to know, what you tried on a technical level. 
Have you tried the curl command that I gave as an example?


Felix




On Wed, 23 Mar 2022 at 19:23, Felix Schumacher <
felix.schumac...@internetallee.de> wrote:



Am 23. März 2022 12:14:25 MEZ schrieb rupali singh <
rupali.r.si...@gmail.com>:

Hi Chris,

I already tried with fully qualified name but its not working

Can you be more specific, what you tried?

Is Chris right and your context name is apex?

Felix

On Tue, Mar 22, 2022, 7:15 PM Christopher Schultz <
ch...@christopherschultz.net> wrote:


All,

On 3/21/22 10:19, Felix Schumacher wrote:

Am 21.03.22 um 06:39 schrieb rupali singh:

Hi Felix,

location of context.xml file is

   cat context.xml| grep RewriteValve
  
className="org.apache.catalina.valves.rewrite.RewriteValve"

/>

   pwd
/opt/tomcat/apache-tomcat-9.0.54/instance/conf

That context.xml is thought to be a default template for all installed
webapps. It will work, but remember, that every installed webapp will
get its own copy of a rewrite valve.

+1

This is probably the problem.


more


/opt/tomcat/apache-tomcat-9.0.54/instance/webapps/ROOT/WEB-INF/rewrite.config

RewriteCond %{QUERY_STRING} p=10001
RewriteRule ^/apex/f$ /apex/myapp [R,L]


I think you want:

RewriteCond %{QUERY_STRING} p=10001
RewriteRule ^/f$ /myapp [R,L]

The prefix /apex is already a part of the context-path and should be
removed from the URL patterns being matched. If you want to redirect to
another web application, you need a fully-qualified redirect like this:

RewriteCond %{QUERY_STRING} p=10001
RewriteRule ^/f$https://www.google.com/  [R,L]

-chris

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Re: Apex SSO

[Peter Chiu]

I will email you directly. For the group knowledge, there is nothing
special you need to do on Tomcat if it is not behind a proxy.

On Thu, Mar 24, 2022 at 1:51 PM rupali singh 
wrote:

> Hi Peter,
>
> Are u using apache web server with tomcat or its only tomcat  .
> if possible can you please share steps for azure AD with me on
> rupali.r.si...@gmail.com
>
>
>
> On Thu, 24 Mar 2022 at 21:21, Peter Chiu  wrote:
>
> > I have a working APEX SSO against Azure AD or On-Permise AD.
> >
> > On Thu, Mar 24, 2022 at 1:13 PM rupali singh 
> > wrote:
> >
> > > HI Team,
> > >
> > > We are using apex 21.1 with tomcat 9.54.
> > > we want to implement SSO for application deployed in Apex  with IDCS
> > > reference URL :
> > >
> > >
> >
> https://www.ateam-oracle.com/post/integrating-apex-with-oracle-identity-cloud-service
> > >
> > > but apex is not at all redirecting to IDCS URL and as per Oracle issue
> is
> > > with tomcat .
> > >
> > > anyone successfully implemented APEX SSO( webserver : apache tomcat)
> > with
> > > Oracle IDCS
> > > or  APEX SSO( webserver : apache tomcat)  with Microsoft Azure AD.
> > > can you please assist us with steps.
> > >
> > > --
> > > Thanks and Regards,
> > > Rupali
> > >
> >
>
>
> --
> Thanks and Regards,
> Rupali
>

Re: Fwd: tomcat 9.50 - rewrite rule question

[rupali singh]

hi,

yes context name is apex.

 https://xyz.ae/apex/f?p=1001    to
https://xyz.ae/apex/myapp 

we dont want to change xyz.ae that will name remain as it is , we want to
change f?p=1001  to myapp



On Wed, 23 Mar 2022 at 19:23, Felix Schumacher <
felix.schumac...@internetallee.de> wrote:

>
>
> Am 23. März 2022 12:14:25 MEZ schrieb rupali singh <
> rupali.r.si...@gmail.com>:
> >Hi Chris,
> >
> >I already tried with fully qualified name but its not working
>
> Can you be more specific, what you tried?
>
> Is Chris right and your context name is apex?
>
> Felix
> >
> >On Tue, Mar 22, 2022, 7:15 PM Christopher Schultz <
> >ch...@christopherschultz.net> wrote:
> >
> >> All,
> >>
> >> On 3/21/22 10:19, Felix Schumacher wrote:
> >> >
> >> > Am 21.03.22 um 06:39 schrieb rupali singh:
> >> >> Hi Felix,
> >> >>
> >> >> location of context.xml file is
> >> >>
> >> >>   cat context.xml| grep RewriteValve
> >> >>   className="org.apache.catalina.valves.rewrite.RewriteValve"
> >> />
> >> >>   pwd
> >> >> /opt/tomcat/apache-tomcat-9.0.54/instance/conf
> >> > That context.xml is thought to be a default template for all installed
> >> > webapps. It will work, but remember, that every installed webapp will
> >> > get its own copy of a rewrite valve.
> >>
> >> +1
> >>
> >> This is probably the problem.
> >>
> >> >> more
> >> >>
> >>
> /opt/tomcat/apache-tomcat-9.0.54/instance/webapps/ROOT/WEB-INF/rewrite.config
> >> >> RewriteCond %{QUERY_STRING} p=10001
> >> >> RewriteRule ^/apex/f$ /apex/myapp [R,L]
> >>
> >>
> >> I think you want:
> >>
> >> RewriteCond %{QUERY_STRING} p=10001
> >> RewriteRule ^/f$ /myapp [R,L]
> >>
> >> The prefix /apex is already a part of the context-path and should be
> >> removed from the URL patterns being matched. If you want to redirect to
> >> another web application, you need a fully-qualified redirect like this:
> >>
> >> RewriteCond %{QUERY_STRING} p=10001
> >> RewriteRule ^/f$ https://www.google.com/ [R,L]
> >>
> >> -chris
> >>
> >> -
> >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> >> For additional commands, e-mail: users-h...@tomcat.apache.org
> >>
> >>
>
> -
> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> For additional commands, e-mail: users-h...@tomcat.apache.org
>
>

-- 
Thanks and Regards,
Rupali

Re: Apex SSO

[rupali singh]

Hi Peter,

Are u using apache web server with tomcat or its only tomcat  .
if possible can you please share steps for azure AD with me on
rupali.r.si...@gmail.com



On Thu, 24 Mar 2022 at 21:21, Peter Chiu  wrote:

> I have a working APEX SSO against Azure AD or On-Permise AD.
>
> On Thu, Mar 24, 2022 at 1:13 PM rupali singh 
> wrote:
>
> > HI Team,
> >
> > We are using apex 21.1 with tomcat 9.54.
> > we want to implement SSO for application deployed in Apex  with IDCS
> > reference URL :
> >
> >
> https://www.ateam-oracle.com/post/integrating-apex-with-oracle-identity-cloud-service
> >
> > but apex is not at all redirecting to IDCS URL and as per Oracle issue is
> > with tomcat .
> >
> > anyone successfully implemented APEX SSO( webserver : apache tomcat)
> with
> > Oracle IDCS
> > or  APEX SSO( webserver : apache tomcat)  with Microsoft Azure AD.
> > can you please assist us with steps.
> >
> > --
> > Thanks and Regards,
> > Rupali
> >
>


-- 
Thanks and Regards,
Rupali

Re: Apex SSO

[Peter Chiu]

I have a working APEX SSO against Azure AD or On-Permise AD.

On Thu, Mar 24, 2022 at 1:13 PM rupali singh 
wrote:

> HI Team,
>
> We are using apex 21.1 with tomcat 9.54.
> we want to implement SSO for application deployed in Apex  with IDCS
> reference URL :
>
> https://www.ateam-oracle.com/post/integrating-apex-with-oracle-identity-cloud-service
>
> but apex is not at all redirecting to IDCS URL and as per Oracle issue is
> with tomcat .
>
> anyone successfully implemented APEX SSO( webserver : apache tomcat)  with
> Oracle IDCS
> or  APEX SSO( webserver : apache tomcat)  with Microsoft Azure AD.
> can you please assist us with steps.
>
> --
> Thanks and Regards,
> Rupali
>

Apex SSO

[rupali singh]

HI Team,

We are using apex 21.1 with tomcat 9.54.
we want to implement SSO for application deployed in Apex  with IDCS
reference URL :
https://www.ateam-oracle.com/post/integrating-apex-with-oracle-identity-cloud-service

but apex is not at all redirecting to IDCS URL and as per Oracle issue is
with tomcat .

anyone successfully implemented APEX SSO( webserver : apache tomcat)  with
Oracle IDCS
or  APEX SSO( webserver : apache tomcat)  with Microsoft Azure AD.
can you please assist us with steps.

-- 
Thanks and Regards,
Rupali

Re: What causes "client errors" with mod_jk

[Rainer Jung]

Hi Chris,

client errors in jk log are always errors occurring when mod_jk tries to 
write back what it got from the backend using web server APIs to the 
client of the web server (user, browser etc.). So they point to a 
problem between and including the web server and something in front of it.


Especially during performance problems, client errors are expected as a 
consequence, because whenever people try to reload, the browser closes 
the original connection and sending back response data via this 
connection later fails.


Best regards,

Rainer

Am 23.03.2022 um 13:08 schrieb Christopher Schultz:

All,

What kinds of things will cause a "client error" in mod_jk's accounting? 
Does that mean things like unexpected disconnects on the part of the 
remote client (i.e. web browser), or does it mean failure of the jk 
module itself to connect (as a client) to the back-end Tomcat?


I'm starting to see situations where we have small numbers of client 
errors occurring "all the time", meaning that we accumulate maybe 10-20 
per day. If that's web browser disconnects then I don't care at all. If 
it's a problem I have with my internal networking and 
resource-allocation, then it's something I have to adjust.


Thanks,
-chris


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AW: Question to possible memory leak by Threadlocal variable

[Thomas Hoffmann (Speed4Trade GmbH)]

> -Ursprüngliche Nachricht-
> Von: Mark Thomas 
> Gesendet: Donnerstag, 24. März 2022 09:32
> An: users@tomcat.apache.org
> Betreff: Re: Question to possible memory leak by Threadlocal variable
> 
> On 24/03/2022 07:57, Thomas Hoffmann (Speed4Trade GmbH) wrote:
> 
> 
> 
> > Is it correct, that every spawned thread must call tl.remove() to cleanup 
> > all
> the references to prevent the logged warning (and not only the main
> thread)?
> 
> Yes. Or the threads need to exit.
> 
> > Second question is: How might it cause a memory leak?
> > The threads are terminated and hold a reference to this static variable. But
> on the other side, that class A is also eligible for garbage collection after
> undeployment.
> > So both, the thread class and the class A are ready to get garbage
> > collected. Maybe I missed something (?)
> 
> It sounds as if the clean-up is happening too late. Tomcat expects clean-up to
> be completed once contextDestroyed() has returned for all
> ServLetContextListeners. If the clean-up is happening asynchronously (e.g.
> the call is made to stop the threads but doesn't wait until the threads have
> stopped) you could see this message.
> 
> In this case it sounds as if you aren't going to get a memory leak but Tomcat
> can't tell that at the point it checks.
> 
> Mark
> 
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Hello Mark,
thanks for the information.
The shutdown of the framework is currently placed within the destroy() method 
of a servlet (with load on startup).
At least the debugger shows that servlet-->destroy() is executed before the 
method checkThreadLocalMapForLeaks() runs.
I will take a look, whether the threads already exited.

Thanks!
Thomas

Re: Question to possible memory leak by Threadlocal variable

[Mark Thomas]

On 24/03/2022 07:57, Thomas Hoffmann (Speed4Trade GmbH) wrote:




Is it correct, that every spawned thread must call tl.remove() to cleanup all 
the references to prevent the logged warning (and not only the main thread)?


Yes. Or the threads need to exit.


Second question is: How might it cause a memory leak?
The threads are terminated and hold a reference to this static variable. But on 
the other side, that class A is also eligible for garbage collection after 
undeployment.
So both, the thread class and the class A are ready to get garbage collected. 
Maybe I missed something (?)


It sounds as if the clean-up is happening too late. Tomcat expects 
clean-up to be completed once contextDestroyed() has returned for all 
ServLetContextListeners. If the clean-up is happening asynchronously 
(e.g. the call is made to stop the threads but doesn't wait until the 
threads have stopped) you could see this message.


In this case it sounds as if you aren't going to get a memory leak but 
Tomcat can't tell that at the point it checks.


Mark

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Question to possible memory leak by Threadlocal variable

[Thomas Hoffmann (Speed4Trade GmbH)]

Hello,

we are using a 3rd party lib/framework in our application.
During undeployment we see a warning about a possible memory leak:

org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks 
The web application [ROOT] created a ThreadLocal with key of type 
[java.lang.ThreadLocal.SuppliedThreadLocal] (value 
[java.lang.ThreadLocal$SuppliedThreadLocal@1a14329f]) and a value of type 
[org.apache.xxx] (value [org.apache.xxx]) but failed to remove it when the web 
application was stopped. Threads are going to be renewed over time to try and 
avoid a probable memory leak.

I dug into the sources and found a class A which has a static ThreadLocal 
variable (let's call it tl). During undeployment there is a tl.remove() in the 
shutdown method.
The warning is logged despite that. The framework is spawning several threads 
which might use class A and its threadlocal variable.
Is it correct, that every spawned thread must call tl.remove() to cleanup all 
the references to prevent the logged warning (and not only the main thread)?

Second question is: How might it cause a memory leak?
The threads are terminated and hold a reference to this static variable. But on 
the other side, that class A is also eligible for garbage collection after 
undeployment.
So both, the thread class and the class A are ready to get garbage collected. 
Maybe I missed something (?)

Before filing a bug report to the maintainer of this lib, I would need to 
understand the cause and background of this log entry.

Thanks in advance!
Thomas