I decided to write about this issue since it happen already twice to me.
Suddenly your Tomcat freezes on deployment. After deleting the content of your weppapp directory and restarting tomcat, it freezes again, but probably on a different place. I spend a some time to find the issue.
I configured some months ago a Log4j SocketAppender (in this case for logstash). But logstash hat some issues after an Elasticsearch upgrade.
After disabling the log4j SocketAppender the application was deploying without problems. Fortunately it was just a test setup, but I reminded me to be very careful about this dependency if it should be used on a production system.