RE: Compatibility Check Tomcat 10.1.x with IBM MQ 9.3.0.20

[Chaudhary, Mohit]

Hello Team,

Please let us know on below query.

Thanks & Regards,
Mohit Chaudhary


-Original Message-
From: Chaudhary, Mohit 
Sent: Friday, June 28, 2024 12:01 AM
To: users@tomcat.apache.org
Subject: Compatibility Check Tomcat 10.1.x with IBM MQ 9.3.0.20

Hi Team,

We have installed Tomcat 10.1.1 in RHEL 8 server so we needed to check if 
tomcat 10.1.1 is compatible with IBM MQ 9.3.0.20.


Thanks & Regards,
Mohit Chaudhary





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Compatibility Check Tomcat 10.1.x with IBM MQ 9.3.0.20

[Chaudhary, Mohit]

Hi Team,

We have installed Tomcat 10.1.1 in RHEL 8 server so we needed to check if 
tomcat 10.1.1 is compatible with IBM MQ 9.3.0.20.


Thanks & Regards,
Mohit Chaudhary

Re: Core Dump File Generation

[Chaudhary, Mohit]

Hi,

Java version 1.8.0_121 is running on server.

Get Outlook for iOS

From: Simon Matter 
Sent: Wednesday, February 28, 2024 4:06:09 PM
To: Tomcat Users List 
Subject: RE: Core Dump File Generation

[You don't often get email from simon.mat...@invoca.ch. Learn why this is 
important at https://aka.ms/LearnAboutSenderIdentification ]

Hi,

> Hi,
>
> I am talking about java core dump file which is generating on tomcat/bin
> path and the OS is RHEL 6.

What's the exact version of Java running?

Regards,
Simon

>
> Thanks & Regards,
> Mohit Chaudhary
>
>
> -Original Message-
> From: Simon Matter 
> Sent: Wednesday, February 28, 2024 3:03 PM
> To: Tomcat Users List 
> Subject: Re: Core Dump File Generation
>
> [You don't often get email from simon.mat...@invoca.ch. Learn why this is
> important at https://aka.ms/LearnAboutSenderIdentification ]
>
> Hi Mohit,
>
>> Hi All,
>>
>> We are facing issues on tomcat. Core dump file generating very
>> frequent twice to thrice in a month and core file size would be 13GB
>> to 15GB every time .Whenever this issue is happening tomcat services
>> stopped
>
> I'm a bit confused, are you talking about a UNIX style core file here or
> some kind of dump from Java?
>
> If it's a UNIX style core file then the culprit may be Java and not Tomcat
> - because Java should never ever dump a core file if it's running without
> errors.
>
> Regards,
> Simon
>
>
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>
>
>
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>
>



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RE: Core Dump File Generation

[Chaudhary, Mohit]

Hi,

I am talking about java core dump file which is generating on tomcat/bin path 
and the OS is RHEL 6.

Thanks & Regards,
Mohit Chaudhary


-Original Message-
From: Simon Matter 
Sent: Wednesday, February 28, 2024 3:03 PM
To: Tomcat Users List 
Subject: Re: Core Dump File Generation

[You don't often get email from simon.mat...@invoca.ch. Learn why this is 
important at https://aka.ms/LearnAboutSenderIdentification ]

Hi Mohit,

> Hi All,
>
> We are facing issues on tomcat. Core dump file generating very
> frequent twice to thrice in a month and core file size would be 13GB
> to 15GB every time .Whenever this issue is happening tomcat services
> stopped

I'm a bit confused, are you talking about a UNIX style core file here or some 
kind of dump from Java?

If it's a UNIX style core file then the culprit may be Java and not Tomcat
- because Java should never ever dump a core file if it's running without 
errors.

Regards,
Simon


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Core Dump File Generation

[Chaudhary, Mohit]

Hi All,

We are facing issues on tomcat. Core dump file generating very frequent twice 
to thrice in a month and core file size would be 13GB to 15GB every time 
.Whenever this issue is happening tomcat services stopped automatically. We 
have done analysis of hs_err_pid.log file and based on analysis we have tried 
many thing (such increased tomcat heap memory ) but unable to resolve this 
issue. Please suggest.


Thanks & Regards,
Mohit Chaudhary

Getting Two times login page issue.

[Chaudhary, Mohit]

Hello Team ,

We are facing a issue with the tomcat application login URL , where it is 
asking twice for login to the user , with first login it will redirect again to 
the login page , while reentering the credentials again , it is successful ( 
with second attempt it is working ) and user will be redirected to the next 
page , this issue we have encountered after a datacenter migration for the 
tomcat server on Test region , the servers were cloned from the original server 
to the new datacenter servers, we had manually updated the new IP address on 
the configuration files related to new servers , but with testing part we 
encountering this issue ,

We had 2 servers on Test region which are load balanced where 1 server is 
working fine ( with another server shutdown ) , no issue with login page on 
this server , while issue happening on another server.

The application login page resides on the Lotus Domino server and 
authentication happens on Domino side and then it redirects the request to 
Apache and Tomcat servers .

Please suggest on this issue .

Thanks,
Mohit

RE: Getting False Tomcat Down Alert

[Chaudhary, Mohit]

Hi,

Please find below script code which has been written.

STAT=`netstat -luptn | grep 8080 | awk '{print $6}'`
if [[ "$STAT" != "LISTEN" ]];
then
echo "Tomcat instance down" >> $MESSAGE
mail -s "Tomcat Instance Down on $HOSTNAME" $mailto < $MESSAGE

Thanks & Regards,
Mohit Chaudhary


-Original Message-
From: Olaf Kock 
Sent: Wednesday, January 3, 2024 2:03 PM
To: users@tomcat.apache.org
Subject: Re: Getting False Tomcat Down Alert

[You don't often get email from tom...@olafkock.de. Learn why this is important 
at https://aka.ms/LearnAboutSenderIdentification ]

On 03.01.24 07:55, Chaudhary, Mohit wrote:
>
> Hello Team,
>
> We have RHEL 6.10 server and  configured custom script in crontab to
> check 8080 port is up or not, if 8080 is down then getting email
> alert. But some time we are facing the false alert for 2 to 3 min.
> When we are checking the tomcat services it was up and running fine
> and nothing was written in logs also.
>
> So is it possible that 8080 port will be down for few minutes when
> tomcat is facing heavy traffic? Or what will be the reason for facing
> the false alert?.
>
To me, the question is rather: *How* does your custom script check port
8080 being up? Because you say that you're checking as well, and this result 
disagrees with the result of the manual check. With two different results, I'd 
first inspect the custom script for its behavior, and suspect it to generate a 
false positive.

It being a script implies that you might be able to share it (or the relevant 
parts of it) here (?)

Olaf



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Getting False Tomcat Down Alert

[Chaudhary, Mohit]

Hello Team,

We have RHEL 6.10 server and  configured custom script in crontab to check 8080 
port is up or not, if 8080 is down then getting email alert. But some time we 
are facing the false alert for 2 to 3 min. When we are checking the tomcat 
services it was up and running fine and nothing was written in logs also.

So is it possible that 8080 port will be down for few minutes when tomcat is 
facing heavy traffic? Or what will be the reason for facing the false alert?.

Thanks & Regards,
Mohit Chaudhary
AMS Middleware Admin
Team DL: 
ams-leveraged-webadmin-offsh...@dxc.com
[cid:image001.png@01DA3E3E.3691CBF0]

RE: Core Dump File generating Issue

[Chaudhary, Mohit]

Hello Team,

Onto our tomcat production environment we are having two server clustered 
.where we have only one tomcat app running.
We are facing some issue in production system and observed there are core dump 
files getting generated inside the tomcat-install/bin folder. The core is 
getting generated along with pid eg. core.21539.
Some times,core dump file keeps up growing in larger size amount like 18GB to 
19GB which is making full the allocated disk for tomcat-install/bin file 
system. This intern causes to get tomcat application on hung state and result 
an instance down for production server. Some time it is highly impacting to one 
node of cluster and some time both the node were down.
For tomcat side, we have not configured/enabled anything related to generate 
the core dump  file at tomcat-install/bin location. We are not aware from where 
and how this core file is getting generated.
The client is asking for an evidence from where the core file is getting 
generated and also application details etc.
We require your support how shall to proceed to analyze core file and provide 
evidence to client. Currently ,we do not have any analyzer tool install on 
system.

Thanks & Regards,
Mohit Chaudhary



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