tomcat - Best way to increase heap size in catalina.sh file for XWiki? -

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i trying configure xwiki on ubuntu 14.0.4 project. keep getting error says: java.lang.outofmemoryerror: java heap space. have tried google'ing solution, nothing have found has worked. majority of solutions allocate more memory jvm in catalina.sh file, using line such "catalina_opts="-xmx800m -xx:maxpermsize=192m". how implement change/where put in catalina.sh file? help.

how did installed tomcat ? if trough apt-get have few information on http://platform.xwiki.org/xwiki/bin/view/adminguide/installationviaapt#htomcatusability. standard tomcat debian package supposed configured using /etc/default/tomcat7 (change version depending on tomcat version).


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