Where is the main method in apache tomcat 9?

Question

我想为我的目标修改 apache tomcat9 所以我想知道程序的起点在哪里作为主要方法？

Answer 1

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