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Spring Boot 4 Actuator in production: endpoints, security, custom health indicators

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Companion repository for the ankurm.com article. Every transcript in docs/output/
was produced by running this project; scripts/run-all.sh regenerates all of them.

Verified against Spring Boot 4.1.1 / Framework 7.0.9 / Security 7.1.1 /
Micrometer 1.17.1 / kafka-clients 4.2.1 on Temurin JDK 25.0.4.1+1.
This commit is contained in:
Ankur Mhatre
2026-09-04 10:40:04 +05:30
commit 4b6cefa60a
64 changed files with 3195 additions and 0 deletions
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scripts/demo-heapdump-leak.sh Executable file
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#!/usr/bin/env bash
# The endpoint that really does hand over your secrets - once you turn it on.
set -uo pipefail
cd "$(dirname "$0")/.."
OUT=docs/output/04-heapdump-leak.txt
B=http://localhost:8080/actuator
{
echo "### profiles: exposeall,open PLUS --management.endpoint.heapdump.access=unrestricted"
echo
echo "\$ curl -s -o /tmp/heap.hprof -w 'status=%{http_code} bytes=%{size_download} type=%{content_type}' $B/heapdump"
curl -s -o /tmp/heap.hprof -w 'status=%{http_code} bytes=%{size_download} type=%{content_type}\n' "$B/heapdump"
echo
echo "\$ strings /tmp/heap.hprof | grep -c 'S3CRET-partner-credential'"
strings /tmp/heap.hprof 2>/dev/null | grep -c 'S3CRET-partner-credential'
echo "\$ strings /tmp/heap.hprof | grep -o 'not-a-real-password[^\"]*' | head -1"
strings /tmp/heap.hprof 2>/dev/null | grep -o 'not-a-real-password[^\"]*' | head -1
echo
echo " /actuator/env masked both of these to ******."
echo " /actuator/heapdump handed over the process memory that contains them in plaintext."
echo " Sanitisation is a property-rendering feature. It is not a security boundary."
rm -f /tmp/heap.hprof
} > "$OUT" 2>&1
echo "wrote $OUT"