On 03.07.2019 14:47, Mohan T wrote:

Hi,

Tom cat  0- version 8.5.35

Operating system- RHEL 7.4
Thanks


Ok. Note that what you are asking is not a tomcat-specific question, it is more of a standard Java question.

You need to find the shell script that starts Tomcat on your system.
That is likely to be in the directory /etc/init.d, or /etc/init.d/rc2.d or 
similar.
In that script, you will find the line(s) that starts the JVM that runs tomcat.
(I cannot tell you what that is exactly, because I do not have a RHEL system available to look at right now). That script should have some internal variables, such as "JAVA_OPTIONS" e.g., which contain the options used on the Java command-line.
That's where you must start looking, to make you modifications.

Note that this system startup/stop script is likely to be overwritten, whenever you install an OS or Tomcat package update. So it would be better to do such changes in a separate file, which is "called-in" when executing the script. The startup script probably already references such separate files just for that purpose. Look at (for example) any references to a directory like /etc/tomcat8 or /etc/default/tomcat e.g.

I believe that the person responsible for the RH tomcat package is also on this 
list.
Maybe he can provide more detailed instructions as to how to do this correctly for that platform.

Of course, you could also search Google for "red hat change tomcat java options", which would have given everyone the nice and comforting feeling that you had "done your homework" before coming here.





Mohan




-----Original Message-----
From: André Warnier (tomcat) [mailto:a...@ice-sa.com]
Sent: Wednesday, July 3, 2019 6:00 PM
To: users@tomcat.apache.org
Subject: Re: JAVA OPTIONS

Hi.
It's always a good idea to provide ALL the precise host/versions information in 
advance :
it saves time for the people answering the question, and it helps you getting 
answers faster.

On 03.07.2019 13:36, Mohan T wrote:
Hi ,

We are using tomcat 8 .
Which version precisely ? (8.x.y)

On what platform ?
And if Windows, as a service or on the command-line ?


How do I set the JAVA OPTIONS for the 
com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl.


It depends on the answers to the above questions.



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