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Posted to users@tomcat.apache.org by Dave <dj...@maccormack.net> on 2013/07/17 19:38:07 UTC
Using addFilter and addServlet
I'm using Tomcat 7.0.42. Most examples of ServletContext.addFilter() and
ServletContext.addServlet() show it being used from a contextInitialized()
event handler, however, the Servlet 3.0 spec doesn't limit the use of
addServlet/addFilter to contextInitialized() (unless it is in there
somewhere and I missed it).
I have successfully used addServlet() from the init() method of a Servlet
(e.g. I've dynamically created several servlets from a servlet that I
specify in a web.xml), however, I have not successfully been able to use
addFilter() from my Servlet init method (although I have done so from a
contextInitialized event handler).
My questions are:
1) am I totally off the mark in thinking it is OK to use addServlet() from
the the init() method of a Servlet? Should I expect this feature to exist
in future releases or is it a side-effect that could disappear at anytime?
2) should I be able to use addFilter() from an init() method or is that
crazy.
Thanks,
Dave
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Re: Using addFilter and addServlet
Posted by Dave <dj...@maccormack.net>.
On Wed, 17 Jul 2013, Mark Thomas wrote:
> No problem. The expectation of the EG (this was before I was an EG
> member but I've chatted about this with Filip who was on the EG for
> Servlet 3.0) was that the adding was only for use during context start.
> There was some debate about adding during run-time but the conclusion
> was not to support that - I think due to potential complexity vs.
> benefit / minimal demand.
>
I can certainly understand that. I'm speculating that using addServlet()
from init() worked because of the Tomcat's support for lazy servlet init.
There's no analogous notion for filters so they never had a chance.
> If you have a use case, feel free to open a Jira for the Servlet EG to
> consider for 3.2. Contact details should be in the 3.1 spec.
>
My use case is pretty simple. I have a ``parent'' servlet that
instantiates a number of ``child'' servlets (there's no real hierarchy
here, once they're started they're all peers) based on the parent's
<init-param> values (e.g. query a database, read configs from a dir, etc).
And, I have multiple parents defined per web.xml file.
I have a reasonable work-around so it's not a big deal. It would just be
a little cleaner if I could do it the way I originally planned.
Dave
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Re: Using addFilter and addServlet
Posted by Mark Thomas <ma...@apache.org>.
On 17/07/2013 19:14, Questiony McAskerton From Queryville wrote:
> On Wed, 17 Jul 2013, Mark Thomas wrote:
>
>>
>> No, but not permitted by the spec.
>>
>> Mark
>>
>
> Mark,
>
> Thank you very much for the quick response.
No problem. The expectation of the EG (this was before I was an EG
member but I've chatted about this with Filip who was on the EG for
Servlet 3.0) was that the adding was only for use during context start.
There was some debate about adding during run-time but the conclusion
was not to support that - I think due to potential complexity vs.
benefit / minimal demand.
If you have a use case, feel free to open a Jira for the Servlet EG to
consider for 3.2. Contact details should be in the 3.1 spec.
Mark
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Re: Using addFilter and addServlet
Posted by Questiony McAskerton From Queryville <dj...@maccormack.net>.
On Wed, 17 Jul 2013, Mark Thomas wrote:
>
> No, but not permitted by the spec.
>
> Mark
>
Mark,
Thank you very much for the quick response.
Dave
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Re: Using addFilter and addServlet
Posted by Mark Thomas <ma...@apache.org>.
On 17/07/2013 18:38, Dave wrote:
>
> I'm using Tomcat 7.0.42. Most examples of ServletContext.addFilter()
> and ServletContext.addServlet() show it being used from a
> contextInitialized() event handler, however, the Servlet 3.0 spec
> doesn't limit the use of addServlet/addFilter to contextInitialized()
> (unless it is in there somewhere and I missed it).
>
> I have successfully used addServlet() from the init() method of a
> Servlet (e.g. I've dynamically created several servlets from a servlet
> that I specify in a web.xml), however, I have not successfully been able
> to use
> addFilter() from my Servlet init method (although I have done so from a
> contextInitialized event handler).
>
> My questions are:
>
> 1) am I totally off the mark in thinking it is OK to use addServlet()
> from the the init() method of a Servlet?
Yes.
> Should I expect this feature to exist in future releases
No.
> or is it a side-effect that could disappear at anytime?
Yes.
> 2) should I be able to use addFilter() from an init() method
No.
> or is that crazy.
No, but not permitted by the spec.
Mark
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Re: How to disable session completely
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Daniel,
On 7/17/13 4:02 PM, Daniel NAZARKIEWICZ wrote:
> What is the procedure to disable entirely the session (JSESSIONID)
> within tomcat 7 ?
Please don't hijack threads. If you would like to ask a new question,
create a new message to the list and don't reply to an existing one.
- -chris
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How to disable session completely
Posted by Daniel NAZARKIEWICZ <dn...@gmail.com>.
Hi,
What is the procedure to disable entirely the session (JSESSIONID)
within tomcat 7 ?
Thank you
Daniel
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