1. Click on the flashback problem.
Focus on checking environment variables.
See if there are any errors in the environment variables of tomcat and jdk. I changed the jdk version last time.
Changed from jdk1.8.0_153 to jdk1.8.0_152. It caused a flashback and stuck for a long time. Just reconfigure the environment variables.
Solution to Tomcat8 startup flashback problem
2. Register tomcat to the service, so that there is no need to keep a tomcat running in the foreground