java - how do i find where JAVA_OPTS data is stored? -

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a centos 7 server has java 7 , tomcat 8 installed. need set permgen space, typing printenv on command line not include java_opts in list of environmental variables. typed ps list of running processes, , typed jmap -heap <pid> pid running java process, listed values maxpermsize , permsize among other values.

how set new values these properties in way persist when system rebooted, etc.? hesitate create java_opts variable if server in question has place stores these persistent values.

edit:

as per @chrisrobak's suggestion, went searching tomcat conf files. there no /etc/tomcat directory, /etc has directories called /etc/java, /etc/.java, /etc/jvm, , /etc/jvm-common. also, tomcat conf follows:

[root@myserver tomcat]# cd /opt/tomcat/conf [root@myserver conf]# ls -al total 280 drwxrwx---.  3 root root   4096 oct 30 20:02 . drwxr-xr-x. 14 root root   4096 oct 30 20:58 .. drwxrwx---.  7 root root   4096 oct 30 21:00 catalina -rwxrwx---.  1 root root  12624 nov  2  2014 catalina.policy -rwxrwx---.  1 root root   6560 nov  2  2014 catalina.properties -rwxrwx---.  1 root root   1852 jan  2  2015 context.xml -rwxrwx---.  1 root root   3451 nov  2  2014 logging.properties -rwxr-x---   1 root root   5018 oct 30 21:52 server.xml -rwxrwx---.  1 root root   1783 nov  2  2014 tomcat-users.xml -rwxrwx---.  1 root root   1888 nov  2  2014 tomcat-users.xsd -rwxrwx---.  1 root root 168082 nov  2  2014 web.xml [root@myserver conf]#

which file should in?

alternatively, there command line way of setting java options not persistent, not cause side effects due conflicts config files? i create java_opts variable if thought rest of server go java_opts default.

answer?

when none of config files , scripts seemed have java_opts set, decided type following in centos 7 terminal: 

export java_opts="-xms256m -xmx1024m -xx:permsize=256m -xx:maxpermsize=512m"

the result maxpermsize has been reset. if else has specific answer centos 7 better this, please alert me.

i think can persist in 

/etc/tomcat8/tomcat8.conf

or similar variant, server had access /etc/tomcat5/tomcat5.conf don't know version in particular


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