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Posted to users@tomcat.apache.org by paybackorfail <th...@hotmail.com> on 2009/02/14 20:45:34 UTC
starting and stoppping tomcat
Hi, I have written a web application in netbeans using java and jsp, and i am
hosting it on a server using tomcat, i need help on finding a way to start
and stop the server by the user clicking a button on a jsp page, do i have
to use the org.apache.catalina.ant.StartTask of the tomcat api? can anyone
help?
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Re: starting and stoppping tomcat
Posted by Rusty Wright <ru...@gmail.com>.
Instead of trying to stop and start tomcat, would it help if your app used a more functional scheduling system? For example, Quartz?
http://www.opensymphony.com/quartz/wikidocs/FAQ.html
paybackorfail wrote:
> Hi, thanks for replying, my application will take some data from a website
> and insert this data into a database and i schedule the application to do
> this every hour using contextlistener and timertask as a java servlet. At
> the moment it starts updating the database as soon as i upload the
> application to the server, I need a way to shutdown the server so it will
> stop updating the database
>
>
> Alan Chaney wrote:
>> I think you need to rethink your use cases here...
>>
>> Exactly WHY do you need to start and stop tomcat from a button on a web
>> page?
>> Or do you really need to enable/disable some kind of function?
>>
>> Generally speaking servers don't expect to be started or stopped by
>> their clients - well, ok, sometimes you can stop a service by a client
>> but almost by definition you can't start a service from a client...
>>
>> Typically tomcat provides a way of processing requests received from
>> remote web clients and arranges for the requests to be processed by a
>> web application. Your application may have state which can be controlled
>> by the request. This shouldn't normally affect tomcat's normal operation.
>>
>> HTH
>>
>> Alan Chaney
>>
>>
>> paybackorfail wrote:
>>> That's a good point, what if it was just an html page?
>>>
>>>
>>> Mark Thomas-18 wrote:
>>>
>>>> paybackorfail wrote:
>>>>
>>>>> Hi, I have written a web application in netbeans using java and jsp,
>>>>> and
>>>>> i am
>>>>> hosting it on a server using tomcat, i need help on finding a way to
>>>>> start
>>>>> and stop the server by the user clicking a button on a jsp page, do i
>>>>> have
>>>>> to use the org.apache.catalina.ant.StartTask of the tomcat api? can
>>>>> anyone
>>>>> help?
>>>>>
>>>> If Tomcat is stopped, how is it going to handle a user clicking on a
>>>> button on a JSP page to start it?
>>>>
>>>> Mark
>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>>
>>>>
>>>>
>>>>
>>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>
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Re: starting and stoppping tomcat
Posted by Alan Chaney <al...@compulsivecreative.com>.
My earlier point was that you need to think about it in a slightly
different way.
Starting and stopping the server is something that is normally done
rarely and anyway, you can't start something that is not already started
by using it to start itself!
What you should do is to add a boolean flag - a state variable to your
servlet. You can set or clear this flag with your page button.
Use this flag to condition your database access - so when the timer
event fires, it checks the state flag and then accesses the database.
Regards
Alan
paybackorfail wrote:
> Hi, thanks for replying, my application will take some data from a website
> and insert this data into a database and i schedule the application to do
> this every hour using contextlistener and timertask as a java servlet. At
> the moment it starts updating the database as soon as i upload the
> application to the server, I need a way to shutdown the server so it will
> stop updating the database
>
>
> Alan Chaney wrote:
>> I think you need to rethink your use cases here...
>>
>> Exactly WHY do you need to start and stop tomcat from a button on a web
>> page?
>> Or do you really need to enable/disable some kind of function?
>>
>> Generally speaking servers don't expect to be started or stopped by
>> their clients - well, ok, sometimes you can stop a service by a client
>> but almost by definition you can't start a service from a client...
>>
>> Typically tomcat provides a way of processing requests received from
>> remote web clients and arranges for the requests to be processed by a
>> web application. Your application may have state which can be controlled
>> by the request. This shouldn't normally affect tomcat's normal operation.
>>
>> HTH
>>
>> Alan Chaney
>>
>>
>> paybackorfail wrote:
>>> That's a good point, what if it was just an html page?
>>>
>>>
>>> Mark Thomas-18 wrote:
>>>
>>>> paybackorfail wrote:
>>>>
>>>>> Hi, I have written a web application in netbeans using java and jsp,
>>>>> and
>>>>> i am
>>>>> hosting it on a server using tomcat, i need help on finding a way to
>>>>> start
>>>>> and stop the server by the user clicking a button on a jsp page, do i
>>>>> have
>>>>> to use the org.apache.catalina.ant.StartTask of the tomcat api? can
>>>>> anyone
>>>>> help?
>>>>>
>>>> If Tomcat is stopped, how is it going to handle a user clicking on a
>>>> button on a JSP page to start it?
>>>>
>>>> Mark
>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>>
>>>>
>>>>
>>>>
>>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>
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Re: starting and stoppping tomcat
Posted by David Smith <dn...@cornell.edu>.
Your better off setting an application scope flag of some sort. Then
have a filter check the flag before letting the request through for
processing. If the flag is set, redirect to an unavailable page.
--David
paybackorfail wrote:
> Hi, thanks for replying, my application will take some data from a website
> and insert this data into a database and i schedule the application to do
> this every hour using contextlistener and timertask as a java servlet. At
> the moment it starts updating the database as soon as i upload the
> application to the server, I need a way to shutdown the server so it will
> stop updating the database
>
>
> Alan Chaney wrote:
>
>> I think you need to rethink your use cases here...
>>
>> Exactly WHY do you need to start and stop tomcat from a button on a web
>> page?
>> Or do you really need to enable/disable some kind of function?
>>
>> Generally speaking servers don't expect to be started or stopped by
>> their clients - well, ok, sometimes you can stop a service by a client
>> but almost by definition you can't start a service from a client...
>>
>> Typically tomcat provides a way of processing requests received from
>> remote web clients and arranges for the requests to be processed by a
>> web application. Your application may have state which can be controlled
>> by the request. This shouldn't normally affect tomcat's normal operation.
>>
>> HTH
>>
>> Alan Chaney
>>
>>
>> paybackorfail wrote:
>>
>>> That's a good point, what if it was just an html page?
>>>
>>>
>>> Mark Thomas-18 wrote:
>>>
>>>
>>>> paybackorfail wrote:
>>>>
>>>>
>>>>> Hi, I have written a web application in netbeans using java and jsp,
>>>>> and
>>>>> i am
>>>>> hosting it on a server using tomcat, i need help on finding a way to
>>>>> start
>>>>> and stop the server by the user clicking a button on a jsp page, do i
>>>>> have
>>>>> to use the org.apache.catalina.ant.StartTask of the tomcat api? can
>>>>> anyone
>>>>> help?
>>>>>
>>>>>
>>>> If Tomcat is stopped, how is it going to handle a user clicking on a
>>>> button on a JSP page to start it?
>>>>
>>>> Mark
>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>>
>
>
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Re: starting and stoppping tomcat
Posted by paybackorfail <th...@hotmail.com>.
Hi, thanks for replying, my application will take some data from a website
and insert this data into a database and i schedule the application to do
this every hour using contextlistener and timertask as a java servlet. At
the moment it starts updating the database as soon as i upload the
application to the server, I need a way to shutdown the server so it will
stop updating the database
Alan Chaney wrote:
>
> I think you need to rethink your use cases here...
>
> Exactly WHY do you need to start and stop tomcat from a button on a web
> page?
> Or do you really need to enable/disable some kind of function?
>
> Generally speaking servers don't expect to be started or stopped by
> their clients - well, ok, sometimes you can stop a service by a client
> but almost by definition you can't start a service from a client...
>
> Typically tomcat provides a way of processing requests received from
> remote web clients and arranges for the requests to be processed by a
> web application. Your application may have state which can be controlled
> by the request. This shouldn't normally affect tomcat's normal operation.
>
> HTH
>
> Alan Chaney
>
>
> paybackorfail wrote:
>> That's a good point, what if it was just an html page?
>>
>>
>> Mark Thomas-18 wrote:
>>
>>> paybackorfail wrote:
>>>
>>>> Hi, I have written a web application in netbeans using java and jsp,
>>>> and
>>>> i am
>>>> hosting it on a server using tomcat, i need help on finding a way to
>>>> start
>>>> and stop the server by the user clicking a button on a jsp page, do i
>>>> have
>>>> to use the org.apache.catalina.ant.StartTask of the tomcat api? can
>>>> anyone
>>>> help?
>>>>
>>> If Tomcat is stopped, how is it going to handle a user clicking on a
>>> button on a JSP page to start it?
>>>
>>> Mark
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>
>>>
>>>
>>>
>>
>>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
--
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Re: starting and stoppping tomcat
Posted by Alan Chaney <al...@compulsivecreative.com>.
I think you need to rethink your use cases here...
Exactly WHY do you need to start and stop tomcat from a button on a web
page?
Or do you really need to enable/disable some kind of function?
Generally speaking servers don't expect to be started or stopped by
their clients - well, ok, sometimes you can stop a service by a client
but almost by definition you can't start a service from a client...
Typically tomcat provides a way of processing requests received from
remote web clients and arranges for the requests to be processed by a
web application. Your application may have state which can be controlled
by the request. This shouldn't normally affect tomcat's normal operation.
HTH
Alan Chaney
paybackorfail wrote:
> That's a good point, what if it was just an html page?
>
>
> Mark Thomas-18 wrote:
>
>> paybackorfail wrote:
>>
>>> Hi, I have written a web application in netbeans using java and jsp, and
>>> i am
>>> hosting it on a server using tomcat, i need help on finding a way to
>>> start
>>> and stop the server by the user clicking a button on a jsp page, do i
>>> have
>>> to use the org.apache.catalina.ant.StartTask of the tomcat api? can
>>> anyone
>>> help?
>>>
>> If Tomcat is stopped, how is it going to handle a user clicking on a
>> button on a JSP page to start it?
>>
>> Mark
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>>
>
>
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Re: starting and stoppping tomcat
Posted by David Smith <dn...@cornell.edu>.
Still no good. Some active code has to respond to a request to start
the server.
--David
paybackorfail wrote:
> That's a good point, what if it was just an html page?
>
>
> Mark Thomas-18 wrote:
>
>> paybackorfail wrote:
>>
>>> Hi, I have written a web application in netbeans using java and jsp, and
>>> i am
>>> hosting it on a server using tomcat, i need help on finding a way to
>>> start
>>> and stop the server by the user clicking a button on a jsp page, do i
>>> have
>>> to use the org.apache.catalina.ant.StartTask of the tomcat api? can
>>> anyone
>>> help?
>>>
>> If Tomcat is stopped, how is it going to handle a user clicking on a
>> button on a JSP page to start it?
>>
>> Mark
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>>
>
>
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Re: starting and stoppping tomcat
Posted by André Warnier <aw...@ice-sa.com>.
My point below was that, to start Tomcat, you usually run a startup
script, as root.
If you want to do that via a html page, then your html page must have
something behind it - on the server - that runs as root to start Tomcat.
That's not a good idea.
But basically this is besides the point. As the other posters wrote,
what you need in your case is not to start and stop the whole Tomcat,
just to be able to start and stop /one application/ inside Tomcat. Or
simply tell it whent it should be active (loading data in the database)
or not.
André Warnier wrote:
> paybackorfail wrote:
>> That's a good point, what if it was just an html page?
>>
> Asking a question here is not really a substitute for thinking.
>
> How are you starting Tomcat now ?
>
>>
>> Mark Thomas-18 wrote:
>>> paybackorfail wrote:
>>>> Hi, I have written a web application in netbeans using java and jsp,
>>>> and
>>>> i am
>>>> hosting it on a server using tomcat, i need help on finding a way to
>>>> start
>>>> and stop the server by the user clicking a button on a jsp page, do i
>>>> have
>>>> to use the org.apache.catalina.ant.StartTask of the tomcat api? can
>>>> anyone
>>>> help?
>>> If Tomcat is stopped, how is it going to handle a user clicking on a
>>> button on a JSP page to start it?
>>>
>>> Mark
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>
>>>
>>>
>>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
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Re: starting and stoppping tomcat
Posted by André Warnier <aw...@ice-sa.com>.
paybackorfail wrote:
> That's a good point, what if it was just an html page?
>
Asking a question here is not really a substitute for thinking.
How are you starting Tomcat now ?
>
> Mark Thomas-18 wrote:
>> paybackorfail wrote:
>>> Hi, I have written a web application in netbeans using java and jsp, and
>>> i am
>>> hosting it on a server using tomcat, i need help on finding a way to
>>> start
>>> and stop the server by the user clicking a button on a jsp page, do i
>>> have
>>> to use the org.apache.catalina.ant.StartTask of the tomcat api? can
>>> anyone
>>> help?
>> If Tomcat is stopped, how is it going to handle a user clicking on a
>> button on a JSP page to start it?
>>
>> Mark
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>
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Re: starting and stoppping tomcat
Posted by paybackorfail <th...@hotmail.com>.
That's a good point, what if it was just an html page?
Mark Thomas-18 wrote:
>
> paybackorfail wrote:
>> Hi, I have written a web application in netbeans using java and jsp, and
>> i am
>> hosting it on a server using tomcat, i need help on finding a way to
>> start
>> and stop the server by the user clicking a button on a jsp page, do i
>> have
>> to use the org.apache.catalina.ant.StartTask of the tomcat api? can
>> anyone
>> help?
>
> If Tomcat is stopped, how is it going to handle a user clicking on a
> button on a JSP page to start it?
>
> Mark
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
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Re: starting and stoppping tomcat
Posted by Mark Thomas <ma...@apache.org>.
paybackorfail wrote:
> Hi, I have written a web application in netbeans using java and jsp, and i am
> hosting it on a server using tomcat, i need help on finding a way to start
> and stop the server by the user clicking a button on a jsp page, do i have
> to use the org.apache.catalina.ant.StartTask of the tomcat api? can anyone
> help?
If Tomcat is stopped, how is it going to handle a user clicking on a
button on a JSP page to start it?
Mark
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