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Add jfr-demo: JFR + Mission Control profiling of a live Spring Boot app

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Custom OrderProcessed event, CPU/allocation/lock workloads, a diagnostic
endpoint over the JVM's live FlightRecorder state, a JUnit test using the
jdk.jfr.Recording API, and nine captured recordings (flagship, mid-flight
snapshot, isolated vs concurrent threshold comparisons, and a real
dump+stop duplication bug) with their docs/output/*.txt transcripts.
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asmhatre
2026-10-01 04:37:26 +00:00
commit c7eccd1db5
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docs/output/02-start-recording-and-diagnostics.txt
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$ jcmd 5287 JFR.start name=demo settings=profile maxsize=256m
5287:
Started recording 15.
Use jcmd 5287 JFR.dump name=demo filename=FILEPATH to copy recording data to file.
$ curl -s localhost:8080/api/jfr/recordings
[{"id":15,"name":"demo","state":"RUNNING","startTime":"2026-10-01T04:30:41.255843977Z","maxSize":268435456,"maxAge":"null","destination":"null"}]
$ jcmd 5287 JFR.stop name=demo filename=/tmp/throwaway-demo.jfr
5287:
Stopped recording "demo", 251.6 kB written to:
/tmp/throwaway-demo.jfr