Hi

what is mod_jk in tomcat server. why it is used.? where it resides?
using this one, the tomcat server performance should increase or not.

mod_jk is not part of Tomcat, per se. It is an apache module which allows apache to communicate with tomcat using a "special" protocol, thereby allowing apache to serve as a front end web server for tomcat.

Therefore, that file will be found wherever apache stores its modules.

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