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Posted to users@tomcat.apache.org by Aden Jones <ad...@gmail.com> on 2009/04/27 10:18:23 UTC
Scheduling tasks in Tomcat
Okay Iam new to Tomcat so please go easy on me.
Basically I've been given an assignment that employs JSF, Hibernate and
Tomcat as the servlet. Ive got everything else working but have two tasks
that need to be run at a certain time of the week. Searching online I've had
a lot of trouble finding anything coherent. My teacher seems to think that
the servlet itself can run the scheduled task by inserting something into my
web.xml file and it will run the classes that are the scheduled tasks.
Any help would be greatly appreciated.
Cheers
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Re: Scheduling tasks in Tomcat
Posted by Dan Armbrust <da...@gmail.com>.
The simplest way to do this is to learn the Timer API:
http://java.sun.com/j2se/1.4.2/docs/api/java/util/Timer.html
Then put your timer code into a new servlet that you add to your
webapp. Or add your code to an existing servlet in your webapp.
There are plenty of other open source scheduling API's as well, but
you probably don't need them for anything this simple.
Dan
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Re: Scheduling tasks in Tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Aden,
On 4/27/2009 4:18 AM, Aden Jones wrote:
> Ive got everything else working but have two tasks
> that need to be run at a certain time of the week.
Dan suggests using Java's Timer class. Lots of folks also use Quartz
(http://www.opensymphony.com/quartz/).
I'd like to recommend the use of good-old cron (or Windows Scheduler if
you're using Windows). If the webapp /must/ be self-contained, then so
be it, but I prefer to use cron so it's not tied to the webapp itself.
- -chris
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Re: Scheduling tasks in Tomcat
Posted by supareno <re...@free.fr>.
Hi,
if it is possible, you could use Spring and the scheduling Quartz
implementation
check out this
http://static.springframework.org/spring/docs/2.5.x/reference/scheduling.html
regards
supareno
> Hi
>
> I would suggest u to use the Listener tag instead of Load on startup
>
> <listener>
> <listener-class>
> org.quartz.ee.servlet.QuartzInitializerListener
> </listener-class>
> </listener>
>
> As per "Quartz Enterprise Job Scheduler API (1.6.2)"
>
> org.quartz.ee.servlet.QuartzInitializerServlet is deprecated
>
>
>
>
> with regards
> Karthik
>
>
> -----Original Message-----
> From: Aden Jones [mailto:adenjones@gmail.com]
> Sent: Tuesday, April 28, 2009 9:35 AM
> To: users@tomcat.apache.org
> Subject: RE: Scheduling tasks in Tomcat
>
>
>
>
> mgainty wrote:
>
>> javac .\org\quartz\ee\servlet\QuartzInitializerServlet.java
>> place .\org\quartz\ee\servlet\QuartzInitializerServlet.class to
>> WEB-INF/classes
>>
>> Okay so QuatzInitializerServlet.java is the class that I create for
>> scheduling the events.
>>
>> your web.xml will need to associate the Servlet class with url-pattern as
>> in this configuration:
>> <servlet>
>> <servlet-name>Servlet</servlet-name>
>>
>> <servlet-class>org.quartz.ee.servlet.QuartzInitializerServlet</servlet-class>
>>
>> It would be okay I suppose if I use my existing structure and reference
>> <servlet-class>com.timekeeper.util.QuartzInitializerServlet</servlet-class>
>> ?
>>
>>
>> <load-on-startup>1</load-on-startup>
>> </servlet>
>> <servlet-mapping>
>> <servlet-name>Servlet</servlet-name>
>> <url-pattern>*</url-pattern>
>>
>> Why would I need to add a url pattern if it only needs to be run on
>> startup?
>> </servlet-mapping>
>>
>> you will also need an startup display page index.jsp and configure
>> index.jsp as welcome-file e.g.
>>
>> <welcome-file-list>
>> <welcome-file>index.jsp</welcome-file>
>> </welcome-file-list>
>>
>> HTH
>> Martin
>> ______________________________________________
>> Disclaimer and Confidentiality/Verzicht und Vertraulichkeitanmerkung /
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>> This message is confidential. If you should not be the intended receiver,
>> then we ask politely to report. Each unauthorized forwarding or
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>> exchange of information and has no legal binding effect. Due to the easy
>> manipulation of emails we cannot take responsibility over the the
>> contents.
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>> les email peuvent facilement être sujets à la manipulation, nous ne
>> pouvons accepter aucune responsabilité pour le contenu fourni.
>>
>>
>>
>>
>>
>>
>>
>>> Date: Mon, 27 Apr 2009 17:52:16 -0700
>>> From: adenjones@gmail.com
>>> To: users@tomcat.apache.org
>>> Subject: Re: Scheduling tasks in Tomcat
>>>
>>>
>>> I will probably use quartz to schedule the actual task and add it to my
>>> webapp as my teacher would prefer that the servlet contains everything.
>>>
>>> What I don't understand is how or if (after I create my class that
>>> contains
>>> the scheduling code) Tomcat actually runs the code. Do I need to add
>>> something to web.xml to tell Tomcat to run it. Does Tomcat run every
>>> class
>>> in the servlet automatically.
>>>
>>>
>>>
>>>
>>> --
>>> View this message in context:
>>> http://www.nabble.com/Scheduling-tasks-in-Tomcat-tp23251939p23268143.html
>>> Sent from the Tomcat - User mailing list archive at Nabble.com.
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>
>>>
>> _________________________________________________________________
>> Rediscover Hotmail®: Now available on your iPhone or BlackBerry
>> http://windowslive.com/RediscoverHotmail?ocid=TXT_TAGLM_WL_HM_Rediscover_Mobile2_042009
>>
>>
>
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> View this message in context: http://www.nabble.com/Scheduling-tasks-in-Tomcat-tp23251939p23269777.html
> Sent from the Tomcat - User mailing list archive at Nabble.com.
>
>
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RE: Scheduling tasks in Tomcat
Posted by Karthik Nanjangude <ka...@xius-bcgi.com>.
Hi
I would suggest u to use the Listener tag instead of Load on startup
<listener>
<listener-class>
org.quartz.ee.servlet.QuartzInitializerListener
</listener-class>
</listener>
As per "Quartz Enterprise Job Scheduler API (1.6.2)"
org.quartz.ee.servlet.QuartzInitializerServlet is deprecated
with regards
Karthik
-----Original Message-----
From: Aden Jones [mailto:adenjones@gmail.com]
Sent: Tuesday, April 28, 2009 9:35 AM
To: users@tomcat.apache.org
Subject: RE: Scheduling tasks in Tomcat
mgainty wrote:
>
>
> javac .\org\quartz\ee\servlet\QuartzInitializerServlet.java
> place .\org\quartz\ee\servlet\QuartzInitializerServlet.class to
> WEB-INF/classes
>
> Okay so QuatzInitializerServlet.java is the class that I create for
> scheduling the events.
>
> your web.xml will need to associate the Servlet class with url-pattern as
> in this configuration:
> <servlet>
> <servlet-name>Servlet</servlet-name>
>
> <servlet-class>org.quartz.ee.servlet.QuartzInitializerServlet</servlet-class>
>
> It would be okay I suppose if I use my existing structure and reference
> <servlet-class>com.timekeeper.util.QuartzInitializerServlet</servlet-class>
> ?
>
>
> <load-on-startup>1</load-on-startup>
> </servlet>
> <servlet-mapping>
> <servlet-name>Servlet</servlet-name>
> <url-pattern>*</url-pattern>
>
> Why would I need to add a url pattern if it only needs to be run on
> startup?
> </servlet-mapping>
>
> you will also need an startup display page index.jsp and configure
> index.jsp as welcome-file e.g.
>
> <welcome-file-list>
> <welcome-file>index.jsp</welcome-file>
> </welcome-file-list>
>
> HTH
> Martin
> ______________________________________________
> Disclaimer and Confidentiality/Verzicht und Vertraulichkeitanmerkung /
> Note de déni et de confidentialité
> This message is confidential. If you should not be the intended receiver,
> then we ask politely to report. Each unauthorized forwarding or
> manufacturing of a copy is inadmissible. This message serves only for the
> exchange of information and has no legal binding effect. Due to the easy
> manipulation of emails we cannot take responsibility over the the
> contents.
> Diese Nachricht ist vertraulich. Sollten Sie nicht der vorgesehene
> Empfaenger sein, so bitten wir hoeflich um eine Mitteilung. Jede unbefugte
> Weiterleitung oder Fertigung einer Kopie ist unzulaessig. Diese Nachricht
> dient lediglich dem Austausch von Informationen und entfaltet keine
> rechtliche Bindungswirkung. Aufgrund der leichten Manipulierbarkeit von
> E-Mails koennen wir keine Haftung fuer den Inhalt uebernehmen.
> Ce message est confidentiel et peut être privilégié. Si vous n'êtes pas le
> destinataire prévu, nous te demandons avec bonté que pour satisfaire
> informez l'expéditeur. N'importe quelle diffusion non autorisée ou la
> copie de ceci est interdite. Ce message sert à l'information seulement et
> n'aura pas n'importe quel effet légalement obligatoire. Étant donné que
> les email peuvent facilement être sujets à la manipulation, nous ne
> pouvons accepter aucune responsabilité pour le contenu fourni.
>
>
>
>
>
>
>> Date: Mon, 27 Apr 2009 17:52:16 -0700
>> From: adenjones@gmail.com
>> To: users@tomcat.apache.org
>> Subject: Re: Scheduling tasks in Tomcat
>>
>>
>> I will probably use quartz to schedule the actual task and add it to my
>> webapp as my teacher would prefer that the servlet contains everything.
>>
>> What I don't understand is how or if (after I create my class that
>> contains
>> the scheduling code) Tomcat actually runs the code. Do I need to add
>> something to web.xml to tell Tomcat to run it. Does Tomcat run every
>> class
>> in the servlet automatically.
>>
>>
>>
>>
>> --
>> View this message in context:
>> http://www.nabble.com/Scheduling-tasks-in-Tomcat-tp23251939p23268143.html
>> Sent from the Tomcat - User mailing list archive at Nabble.com.
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>
> _________________________________________________________________
> Rediscover Hotmail®: Now available on your iPhone or BlackBerry
> http://windowslive.com/RediscoverHotmail?ocid=TXT_TAGLM_WL_HM_Rediscover_Mobile2_042009
>
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RE: Scheduling tasks in Tomcat
Posted by Aden Jones <ad...@gmail.com>.
mgainty wrote:
>
>
> javac .\org\quartz\ee\servlet\QuartzInitializerServlet.java
> place .\org\quartz\ee\servlet\QuartzInitializerServlet.class to
> WEB-INF/classes
>
> Okay so QuatzInitializerServlet.java is the class that I create for
> scheduling the events.
>
> your web.xml will need to associate the Servlet class with url-pattern as
> in this configuration:
> <servlet>
> <servlet-name>Servlet</servlet-name>
>
> <servlet-class>org.quartz.ee.servlet.QuartzInitializerServlet</servlet-class>
>
> It would be okay I suppose if I use my existing structure and reference
> <servlet-class>com.timekeeper.util.QuartzInitializerServlet</servlet-class>
> ?
>
>
> <load-on-startup>1</load-on-startup>
> </servlet>
> <servlet-mapping>
> <servlet-name>Servlet</servlet-name>
> <url-pattern>*</url-pattern>
>
> Why would I need to add a url pattern if it only needs to be run on
> startup?
> </servlet-mapping>
>
> you will also need an startup display page index.jsp and configure
> index.jsp as welcome-file e.g.
>
> <welcome-file-list>
> <welcome-file>index.jsp</welcome-file>
> </welcome-file-list>
>
> HTH
> Martin
> ______________________________________________
> Disclaimer and Confidentiality/Verzicht und Vertraulichkeitanmerkung /
> Note de déni et de confidentialité
> This message is confidential. If you should not be the intended receiver,
> then we ask politely to report. Each unauthorized forwarding or
> manufacturing of a copy is inadmissible. This message serves only for the
> exchange of information and has no legal binding effect. Due to the easy
> manipulation of emails we cannot take responsibility over the the
> contents.
> Diese Nachricht ist vertraulich. Sollten Sie nicht der vorgesehene
> Empfaenger sein, so bitten wir hoeflich um eine Mitteilung. Jede unbefugte
> Weiterleitung oder Fertigung einer Kopie ist unzulaessig. Diese Nachricht
> dient lediglich dem Austausch von Informationen und entfaltet keine
> rechtliche Bindungswirkung. Aufgrund der leichten Manipulierbarkeit von
> E-Mails koennen wir keine Haftung fuer den Inhalt uebernehmen.
> Ce message est confidentiel et peut être privilégié. Si vous n'êtes pas le
> destinataire prévu, nous te demandons avec bonté que pour satisfaire
> informez l'expéditeur. N'importe quelle diffusion non autorisée ou la
> copie de ceci est interdite. Ce message sert à l'information seulement et
> n'aura pas n'importe quel effet légalement obligatoire. Étant donné que
> les email peuvent facilement être sujets à la manipulation, nous ne
> pouvons accepter aucune responsabilité pour le contenu fourni.
>
>
>
>
>
>
>> Date: Mon, 27 Apr 2009 17:52:16 -0700
>> From: adenjones@gmail.com
>> To: users@tomcat.apache.org
>> Subject: Re: Scheduling tasks in Tomcat
>>
>>
>> I will probably use quartz to schedule the actual task and add it to my
>> webapp as my teacher would prefer that the servlet contains everything.
>>
>> What I don't understand is how or if (after I create my class that
>> contains
>> the scheduling code) Tomcat actually runs the code. Do I need to add
>> something to web.xml to tell Tomcat to run it. Does Tomcat run every
>> class
>> in the servlet automatically.
>>
>>
>>
>>
>> --
>> View this message in context:
>> http://www.nabble.com/Scheduling-tasks-in-Tomcat-tp23251939p23268143.html
>> Sent from the Tomcat - User mailing list archive at Nabble.com.
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>
> _________________________________________________________________
> Rediscover Hotmail®: Now available on your iPhone or BlackBerry
> http://windowslive.com/RediscoverHotmail?ocid=TXT_TAGLM_WL_HM_Rediscover_Mobile2_042009
>
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Re: Scheduling tasks in Tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Martin,
On 4/27/2009 9:39 PM, Martin Gainty wrote:
> javac .\org\quartz\ee\servlet\QuartzInitializerServlet.java
> place .\org\quartz\ee\servlet\QuartzInitializerServlet.class to WEB-INF/classes
>
> your web.xml will need to associate the Servlet class with url-pattern as in this configuration:
This is bad advice. It would be better to use a ServletContextListener
than a Servlet.
- -chris
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Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
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RE: Scheduling tasks in Tomcat
Posted by Martin Gainty <mg...@hotmail.com>.
javac .\org\quartz\ee\servlet\QuartzInitializerServlet.java
place .\org\quartz\ee\servlet\QuartzInitializerServlet.class to WEB-INF/classes
your web.xml will need to associate the Servlet class with url-pattern as in this configuration:
<servlet>
<servlet-name>Servlet</servlet-name>
<servlet-class>org.quartz.ee.servlet.QuartzInitializerServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Servlet</servlet-name>
<url-pattern>*</url-pattern>
</servlet-mapping>
you will also need an startup display page index.jsp and configure index.jsp as welcome-file e.g.
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
HTH
Martin
______________________________________________
Disclaimer and Confidentiality/Verzicht und Vertraulichkeitanmerkung / Note de déni et de confidentialité
This message is confidential. If you should not be the intended receiver, then we ask politely to report. Each unauthorized forwarding or manufacturing of a copy is inadmissible. This message serves only for the exchange of information and has no legal binding effect. Due to the easy manipulation of emails we cannot take responsibility over the the contents.
Diese Nachricht ist vertraulich. Sollten Sie nicht der vorgesehene Empfaenger sein, so bitten wir hoeflich um eine Mitteilung. Jede unbefugte Weiterleitung oder Fertigung einer Kopie ist unzulaessig. Diese Nachricht dient lediglich dem Austausch von Informationen und entfaltet keine rechtliche Bindungswirkung. Aufgrund der leichten Manipulierbarkeit von E-Mails koennen wir keine Haftung fuer den Inhalt uebernehmen.
Ce message est confidentiel et peut être privilégié. Si vous n'êtes pas le destinataire prévu, nous te demandons avec bonté que pour satisfaire informez l'expéditeur. N'importe quelle diffusion non autorisée ou la copie de ceci est interdite. Ce message sert à l'information seulement et n'aura pas n'importe quel effet légalement obligatoire. Étant donné que les email peuvent facilement être sujets à la manipulation, nous ne pouvons accepter aucune responsabilité pour le contenu fourni.
> Date: Mon, 27 Apr 2009 17:52:16 -0700
> From: adenjones@gmail.com
> To: users@tomcat.apache.org
> Subject: Re: Scheduling tasks in Tomcat
>
>
> I will probably use quartz to schedule the actual task and add it to my
> webapp as my teacher would prefer that the servlet contains everything.
>
> What I don't understand is how or if (after I create my class that contains
> the scheduling code) Tomcat actually runs the code. Do I need to add
> something to web.xml to tell Tomcat to run it. Does Tomcat run every class
> in the servlet automatically.
>
>
>
>
> --
> View this message in context: http://www.nabble.com/Scheduling-tasks-in-Tomcat-tp23251939p23268143.html
> Sent from the Tomcat - User mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
_________________________________________________________________
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http://windowslive.com/RediscoverHotmail?ocid=TXT_TAGLM_WL_HM_Rediscover_Mobile2_042009
Re: Scheduling tasks in Tomcat
Posted by Aden Jones <ad...@gmail.com>.
I will probably use quartz to schedule the actual task and add it to my
webapp as my teacher would prefer that the servlet contains everything.
What I don't understand is how or if (after I create my class that contains
the scheduling code) Tomcat actually runs the code. Do I need to add
something to web.xml to tell Tomcat to run it. Does Tomcat run every class
in the servlet automatically.
--
View this message in context: http://www.nabble.com/Scheduling-tasks-in-Tomcat-tp23251939p23268143.html
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Re: Scheduling tasks in Tomcat
Posted by Pid <p...@pidster.com>.
Aden Jones wrote:
> Okay Iam new to Tomcat so please go easy on me.
>
> Basically I've been given an assignment that employs JSF, Hibernate and
> Tomcat as the servlet.
Tomcat is the "Servlet Container".
You write or add Servlets to it.
> Ive got everything else working but have two tasks
> that need to be run at a certain time of the week. Searching online I've had
> a lot of trouble finding anything coherent. My teacher seems to think that
> the servlet itself can run the scheduled task by inserting something into my
> web.xml file and it will run the classes that are the scheduled tasks.
A Servlet coded to do such a thing could do.
Tomcat does not have a job scheduler built into it.
There are open source job scheduler libraries written in Java that are
easy to use with Servlet Containers. GIYF.
p
> Any help would be greatly appreciated.
>
> Cheers
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