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Posted to users@tomcat.apache.org by Randhir Singh <ra...@sterlite.com> on 2014/05/15 09:17:02 UTC

Tomcat dependency on application server

Hi,

We have JBoss as the application server & Tomcat as the web server in our
production & developmental setup which is on Red Hat Linux 5.X. We have
tomcat 6.X. My query is that if I need to restart tomcat, do I need to
restart JBoss & Tomcat both or just restarting Tomcat would be enough. I am
asking this query because I had killed the tomcat process using kill -9 and
while restarting tomcat it was not starting but when I killed JBoss &
tomcat and then restarted, Tomcat was up.

I hope my query is clear whether Tomcat is dependent on JBoss.

Regards

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RE: Tomcat dependency on application server

Posted by P Manchanda <ma...@yahoo.com>.
JBoss uses Tomcat as its Servlet container, so there should be no need for a separate tomcat. 

Can you let us know for what purpose you are using a separate tomcat. 

___________________ 
Thks & brgds 
P Manchanda



--------------------------------------------
On Sun, 18/5/14, Terence M. Bandoian <te...@tmbsw.com> wrote:

 Subject: RE: Tomcat dependency on application server
 To: "Tomcat Users List" <us...@tomcat.apache.org>
 Date: Sunday, 18 May, 2014, 2:00
 
 On 5/17/2014 4:35 AM,
 Randhir Singh wrote:
 > I have 1
 observation. In our developmental environment, I killed the
 Tomcat
 > process and started the Tomcat
 it worked. But in the production environment,
 > starting Tomcat was not enough and I had
 to restart JBoss & Tomcat in
 >
 sequence for Tomcat to be up. Could it mean that JVM is
 crashing or
 > something because of OOME
 in Tomcat.
 >
 > I could
 try to increase the heap & Permgen memory in Tomcat,
 would that
 > help?
 >
 > Requesting a
 reply.
 >
 > Regards
 >
 > -----Original
 Message-----
 > From: Randhir Singh
 [mailto:randhir.singh@sterlite.com]
 > Sent: Saturday, May 17, 2014 11:00 AM
 > To: 'Tomcat Users List'
 > Subject: RE: Tomcat dependency on
 application server
 >
 >
 Thanks Chris for your answer. There were separate PID's
 on Linux for JBoss &
 > Tomcat and I
 killed the Tomcat process. Would killing a Tomcat process
 also
 > kill the JVM process? I had
 another related question of how to know the
 > number of JVM's running, I mean the
 count of the number of JVM's.
 >
 > I hope, my query has been put across
 correctly.
 >
 >
 Requesting a reply.
 >
 > Regards
 >
 > -----Original Message-----
 > From: Christopher Schultz [mailto:chris@christopherschultz.net]
 > Sent: Saturday, May 17, 2014 1:59 AM
 > To: Tomcat Users List
 >
 Subject: Re: Tomcat dependency on application server
 >
 > -----BEGIN PGP SIGNED
 MESSAGE-----
 > Hash: SHA256
 >
 > Randhir,
 >
 > On 5/15/14, 3:17 AM,
 Randhir Singh wrote:
 >> Hi,
 >>
 >> We have JBoss
 as the application server & Tomcat as the web server
 in
 >> our production &
 developmental setup which is on Red Hat Linux 5.X. We
 >> have tomcat 6.X. My query is that if I
 need to restart tomcat, do I
 >> need
 to restart JBoss & Tomcat both or just restarting Tomcat
 would be
 >> enough. I am asking this
 query because I had killed the tomcat process
 >> using kill -9 and while restarting
 tomcat it was not starting but when
 >>
 I killed JBoss & tomcat and then restarted, Tomcat was
 up.
 >>
 >> I hope
 my query is clear whether Tomcat is dependent on JBoss.
 > I'm fairly sure that there is only a
 single JVM for JBoss/Tomcat. If you
 >
 killed one, you've killed the other.
 >
 > - -chris
 
 
  From what
 I've read, JBoss is based on a forked version of Tomcat
 and 
 shouldn't need a separate instance
 of Tomcat to function.  Are you using 
 them
 together to serve separate content?  If so, why?
 
 -Terence Bandoian
 
 
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RE: Tomcat dependency on application server

Posted by "Terence M. Bandoian" <te...@tmbsw.com>.
On 5/17/2014 4:35 AM, Randhir Singh wrote:
> I have 1 observation. In our developmental environment, I killed the Tomcat
> process and started the Tomcat it worked. But in the production environment,
> starting Tomcat was not enough and I had to restart JBoss & Tomcat in
> sequence for Tomcat to be up. Could it mean that JVM is crashing or
> something because of OOME in Tomcat.
>
> I could try to increase the heap & Permgen memory in Tomcat, would that
> help?
>
> Requesting a reply.
>
> Regards
>
> -----Original Message-----
> From: Randhir Singh [mailto:randhir.singh@sterlite.com]
> Sent: Saturday, May 17, 2014 11:00 AM
> To: 'Tomcat Users List'
> Subject: RE: Tomcat dependency on application server
>
> Thanks Chris for your answer. There were separate PID's on Linux for JBoss &
> Tomcat and I killed the Tomcat process. Would killing a Tomcat process also
> kill the JVM process? I had another related question of how to know the
> number of JVM's running, I mean the count of the number of JVM's.
>
> I hope, my query has been put across correctly.
>
> Requesting a reply.
>
> Regards
>
> -----Original Message-----
> From: Christopher Schultz [mailto:chris@christopherschultz.net]
> Sent: Saturday, May 17, 2014 1:59 AM
> To: Tomcat Users List
> Subject: Re: Tomcat dependency on application server
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Randhir,
>
> On 5/15/14, 3:17 AM, Randhir Singh wrote:
>> Hi,
>>
>> We have JBoss as the application server & Tomcat as the web server in
>> our production & developmental setup which is on Red Hat Linux 5.X. We
>> have tomcat 6.X. My query is that if I need to restart tomcat, do I
>> need to restart JBoss & Tomcat both or just restarting Tomcat would be
>> enough. I am asking this query because I had killed the tomcat process
>> using kill -9 and while restarting tomcat it was not starting but when
>> I killed JBoss & tomcat and then restarted, Tomcat was up.
>>
>> I hope my query is clear whether Tomcat is dependent on JBoss.
> I'm fairly sure that there is only a single JVM for JBoss/Tomcat. If you
> killed one, you've killed the other.
>
> - -chris


 From what I've read, JBoss is based on a forked version of Tomcat and 
shouldn't need a separate instance of Tomcat to function.  Are you using 
them together to serve separate content?  If so, why?

-Terence Bandoian


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Re: Tomcat dependency on application server

Posted by Neven Cvetkovic <ne...@gmail.com>.
On Sat, May 17, 2014 at 7:05 PM, Leon Rosenberg <ro...@gmail.com>wrote:

> Really, there are about 1 gazzillion valid ways to setup an application
> consisting of n number of tomcats and m number of jbosses, running in same
> or separate processes/vms/datacenters and doing stuff.
>

+1. Agreed


> Maybe you should first find out, what your deployment architecture is, and
> what your app does.
> Probably ps is a good way to start to find out what is really running on
> your machine and where.
>
>
+1. Figure out exactly what's running on your machine, and read
architectural documentation why that is. Hopefully, someone documented the
architectural decisions your team made.


Additional questions to answer:

1) How are you starting your JBoss? How are you starting your Tomcat?

2) How did you find out there are two processes, one for JBoss one for
Tomcat?

3) Why do you have two Java processes, one for JBoss and one for Tomcat?

4) What do you deploy to JBoss, what do you deploy to Tomcat? Why?

5) What version of JBoss AS/EAP do you run?


This is definitely not a typical JBoss/Tomcat setup, there should be a
reason why you have both JBoss and Tomcat.




Here are possible confusion points:

(a) People often confuse Apache Tomcat with Apache HTTPD (webserver).
Apache HTTPD (webserver) is used often as a front for a JBoss, and it is a
separate process you run (not Java process, but "httpd/httpd.exe" compiled
natively for your platform).

(b) JBoss AS/EAP 5 had a component installed as a jbossweb.sar which is
something very similar to Tomcat 6.x codebase, together with server.xml,
and other configuration files. We often say "JBoss AS5/EAP5" contains
Tomcat instance as its servlet container.

(c) JBoss AS7/EAP6 doesn't have jbossweb.sar anymore, but has a subsystem
defined in JBOSS_HOME/standalone/configuration/standalone.xml under "web"
subsystem.


Hopefully that helps!

Cheers!
n.

Re: Tomcat dependency on application server

Posted by Leon Rosenberg <ro...@gmail.com>.
Really, there are about 1 gazzillion valid ways to setup an application
consisting of n number of tomcats and m number of jbosses, running in same
or separate processes/vms/datacenters and doing stuff.
Maybe you should first find out, what your deployment architecture is, and
what your app does.
Probably ps is a good way to start to find out what is really running on
your machine and where.

Leon


On Sat, May 17, 2014 at 11:35 AM, Randhir Singh
<ra...@sterlite.com>wrote:

> I have 1 observation. In our developmental environment, I killed the Tomcat
> process and started the Tomcat it worked. But in the production
> environment,
> starting Tomcat was not enough and I had to restart JBoss & Tomcat in
> sequence for Tomcat to be up. Could it mean that JVM is crashing or
> something because of OOME in Tomcat.
>
> I could try to increase the heap & Permgen memory in Tomcat, would that
> help?
>
> Requesting a reply.
>
> Regards
>
> -----Original Message-----
> From: Randhir Singh [mailto:randhir.singh@sterlite.com]
> Sent: Saturday, May 17, 2014 11:00 AM
> To: 'Tomcat Users List'
> Subject: RE: Tomcat dependency on application server
>
> Thanks Chris for your answer. There were separate PID's on Linux for JBoss
> &
> Tomcat and I killed the Tomcat process. Would killing a Tomcat process also
> kill the JVM process? I had another related question of how to know the
> number of JVM's running, I mean the count of the number of JVM's.
>
> I hope, my query has been put across correctly.
>
> Requesting a reply.
>
> Regards
>
> -----Original Message-----
> From: Christopher Schultz [mailto:chris@christopherschultz.net]
> Sent: Saturday, May 17, 2014 1:59 AM
> To: Tomcat Users List
> Subject: Re: Tomcat dependency on application server
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Randhir,
>
> On 5/15/14, 3:17 AM, Randhir Singh wrote:
> > Hi,
> >
> > We have JBoss as the application server & Tomcat as the web server in
> > our production & developmental setup which is on Red Hat Linux 5.X. We
> > have tomcat 6.X. My query is that if I need to restart tomcat, do I
> > need to restart JBoss & Tomcat both or just restarting Tomcat would be
> > enough. I am asking this query because I had killed the tomcat process
> > using kill -9 and while restarting tomcat it was not starting but when
> > I killed JBoss & tomcat and then restarted, Tomcat was up.
> >
> > I hope my query is clear whether Tomcat is dependent on JBoss.
>
> I'm fairly sure that there is only a single JVM for JBoss/Tomcat. If you
> killed one, you've killed the other.
>
> - -chris
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> Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
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> -----END PGP SIGNATURE-----
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
> --
>
> *STL Disclaimer:*
> The content of this message may be legally privileged and confidential and
> are for the use of the intended recipient(s) only. It should not be read,
> copied and used by anyone other than the intended recipient(s). If you have
> received this message in error, please immediately notify the sender,
> preserve its confidentiality and delete it. Before opening any attachments
> please check them for viruses and defects. No employee or agent is
> authorised to conclude any binding agreement on behalf of Sterlite
> Technologies Limited with another party by email without express written
> confirmation by authorised person. Visit us at
> www.sterlitetechnologies.com
>  Please consider environment before printing this email !
>
>
>
>
>
> ---------------------------------------------------------------------
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> For additional commands, e-mail: users-help@tomcat.apache.org
>
>

RE: Tomcat dependency on application server

Posted by Randhir Singh <ra...@sterlite.com>.
I have 1 observation. In our developmental environment, I killed the Tomcat
process and started the Tomcat it worked. But in the production environment,
starting Tomcat was not enough and I had to restart JBoss & Tomcat in
sequence for Tomcat to be up. Could it mean that JVM is crashing or
something because of OOME in Tomcat.

I could try to increase the heap & Permgen memory in Tomcat, would that
help?

Requesting a reply.

Regards

-----Original Message-----
From: Randhir Singh [mailto:randhir.singh@sterlite.com]
Sent: Saturday, May 17, 2014 11:00 AM
To: 'Tomcat Users List'
Subject: RE: Tomcat dependency on application server

Thanks Chris for your answer. There were separate PID's on Linux for JBoss &
Tomcat and I killed the Tomcat process. Would killing a Tomcat process also
kill the JVM process? I had another related question of how to know the
number of JVM's running, I mean the count of the number of JVM's.

I hope, my query has been put across correctly.

Requesting a reply.

Regards

-----Original Message-----
From: Christopher Schultz [mailto:chris@christopherschultz.net]
Sent: Saturday, May 17, 2014 1:59 AM
To: Tomcat Users List
Subject: Re: Tomcat dependency on application server

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Randhir,

On 5/15/14, 3:17 AM, Randhir Singh wrote:
> Hi,
>
> We have JBoss as the application server & Tomcat as the web server in
> our production & developmental setup which is on Red Hat Linux 5.X. We
> have tomcat 6.X. My query is that if I need to restart tomcat, do I
> need to restart JBoss & Tomcat both or just restarting Tomcat would be
> enough. I am asking this query because I had killed the tomcat process
> using kill -9 and while restarting tomcat it was not starting but when
> I killed JBoss & tomcat and then restarted, Tomcat was up.
>
> I hope my query is clear whether Tomcat is dependent on JBoss.

I'm fairly sure that there is only a single JVM for JBoss/Tomcat. If you
killed one, you've killed the other.

- -chris
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Version: GnuPG v1
Comment: GPGTools - http://gpgtools.org
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

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-----END PGP SIGNATURE-----

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The content of this message may be legally privileged and confidential and 
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received this message in error, please immediately notify the sender, 
preserve its confidentiality and delete it. Before opening any attachments 
please check them for viruses and defects. No employee or agent is 
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Technologies Limited with another party by email without express written 
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 Please consider environment before printing this email !





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RE: Tomcat dependency on application server

Posted by Randhir Singh <ra...@sterlite.com>.
Thanks Chris for your answer. There were separate PID's on Linux for JBoss &
Tomcat and I killed the Tomcat process. Would killing a Tomcat process also
kill the JVM process? I had another related question of how to know the
number of JVM's running, I mean the count of the number of JVM's.

I hope, my query has been put across correctly.

Requesting a reply.

Regards

-----Original Message-----
From: Christopher Schultz [mailto:chris@christopherschultz.net]
Sent: Saturday, May 17, 2014 1:59 AM
To: Tomcat Users List
Subject: Re: Tomcat dependency on application server

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Randhir,

On 5/15/14, 3:17 AM, Randhir Singh wrote:
> Hi,
>
> We have JBoss as the application server & Tomcat as the web server in
> our production & developmental setup which is on Red Hat Linux 5.X. We
> have tomcat 6.X. My query is that if I need to restart tomcat, do I
> need to restart JBoss & Tomcat both or just restarting Tomcat would be
> enough. I am asking this query because I had killed the tomcat process
> using kill -9 and while restarting tomcat it was not starting but when
> I killed JBoss & tomcat and then restarted, Tomcat was up.
>
> I hope my query is clear whether Tomcat is dependent on JBoss.

I'm fairly sure that there is only a single JVM for JBoss/Tomcat. If you
killed one, you've killed the other.

- -chris
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
Comment: GPGTools - http://gpgtools.org
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

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=bJS6
-----END PGP SIGNATURE-----

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are for the use of the intended recipient(s) only. It should not be read, 
copied and used by anyone other than the intended recipient(s). If you have 
received this message in error, please immediately notify the sender, 
preserve its confidentiality and delete it. Before opening any attachments 
please check them for viruses and defects. No employee or agent is 
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Technologies Limited with another party by email without express written 
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 Please consider environment before printing this email !





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Re: Tomcat dependency on application server

Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Randhir,

On 5/15/14, 3:17 AM, Randhir Singh wrote:
> Hi,
> 
> We have JBoss as the application server & Tomcat as the web server
> in our production & developmental setup which is on Red Hat Linux
> 5.X. We have tomcat 6.X. My query is that if I need to restart
> tomcat, do I need to restart JBoss & Tomcat both or just restarting
> Tomcat would be enough. I am asking this query because I had killed
> the tomcat process using kill -9 and while restarting tomcat it was
> not starting but when I killed JBoss & tomcat and then restarted,
> Tomcat was up.
> 
> I hope my query is clear whether Tomcat is dependent on JBoss.

I'm fairly sure that there is only a single JVM for JBoss/Tomcat. If
you killed one, you've killed the other.

- -chris
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
Comment: GPGTools - http://gpgtools.org
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

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