[FIXED] Where is the main method in apache tomcat 9?

Issue

I want to modify apache tomcat9 for my goals so I want to know where the start point of the program as main method?

Solution

One of the tip is to use jps (A CLI tool shipped with Java SDK) to print out the main method that start a Java Process after you start Tomcat. You have to use -l if you want to display full patch of the main method and -m to display the arguments passed to the main method :

jps -lmv

Then it will show something like :

6622 org.apache.catalina.startup.Bootstrap start --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED -Djava.util.logging.config.file=/Users/kc/Downloads/apache-tomcat-9.0.8/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -Dcatalina.base=/Users/kc/Downloads/apache-tomcat-9.0.8 -Dcatalina.home=/Users/kc/Downloads/apache-tomcat-9.0.8 -Djava.io.tmpdir=/Users/kc/Downloads/apache-tomcat-9.0.8/temp

which means the main method that start Tomcat is the class org.apache.catalina.startup.Bootstrap

Answered By - Ken Chan