##Building:

javac src/com/gc/example/GCExample.java -d `pwd`; jar cvfm GCExample.jar src/com/gc/example/manifest.txt com/gc/example/GCExample.class;

##Running with GC options (JDK 11):

rm -f `pwd`/gc*; java -Xms50m -Xmx50m -Xlog:gc*=debug:file=`pwd`/gc.log:tags,time:filecount=10,filesize=4M -jar GCExample.jar

##Running with JFR options (JDK 11):

java -Xms50m -Xmx50m -XX:+FlightRecorder -XX:StartFlightRecording=disk=true,maxage=2h -jar GCExample.jar

##Taking the dump:

jcmd 25270 JFR.dump name=1 filename=`pwd`/gc.jfr

##Open JFR file with Java Mission Control and analyze.

Running GCViewer to analyze gc logs:

java -jar gcviewer-1.36.jar