This can be used on Windows to allow VisualVM to connect to a running Tomcat instance:

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set JAVA_OPTS=-Dcom.sun.management.jmxremote ^  
  -Dcom.sun.management.jmxremote.port=9090 ^  
  -Dcom.sun.management.jmxremote.ssl=false ^  
  -Dcom.sun.management.jmxremote.authenticate=false