Spring Security 7.1 JWT authentication on Spring Boot 4.1

Runnable companion for https://ankurm.com/spring-security-7-1-jwt-authentication-guide/

- login -> token issue -> OncePerRequestFilter -> SecurityContext, end to end
- HS256 and RS256 variants (RS256 publishes a real JWKS endpoint)
- the same API secured by the built-in oauth2ResourceServer().jwt(), for comparison
- 11 documentation chapters under docs/, interlinked with the code
- docs/output/ is real captured output, regenerated by scripts/run-all.sh
- 13 passing tests pinning the 401-vs-403 contract and the CSRF failure

Verified against Spring Boot 4.1.1, Spring Security 7.1.1, JDK 25.0.4.1.

scripts/run-all.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+# Regenerates every file under docs/output/ from a real run.
+# Usage: ./scripts/run-all.sh
+set -eu
+cd "$(dirname "$0")/.."
+
+echo "==> mvn test"
+{
+  echo "=========================================================================="
+  echo " jwt-auth-demo - test run"
+  echo "=========================================================================="
+  echo
+  mvn -B test 2>&1 | grep -E '^\[INFO\] (Running|Tests run)|^\[ERROR\]|BUILD (SUCCESS|FAILURE)' \
+    | sed 's/^\[INFO\] //'
+  echo
+  echo "JDK      : $(java -version 2>&1 | grep -v JAVA_TOOL | head -1)"
+  echo "Boot     : 4.1.1"
+  echo "Security : 7.1.1"
+} > docs/output/test-run.txt
+
+echo "==> hs256 (manual filter) transcript"
+./scripts/run.sh hs256           >/dev/null && ./scripts/curl-transcript.sh > docs/output/curl-transcript-hs256.txt 2>&1
+
+echo "==> rs256 transcript"
+./scripts/run.sh rs256           >/dev/null && ./scripts/rs256-demo.sh      > docs/output/rs256-demo.txt 2>&1
+
+echo "==> csrf vs permitAll"
+./scripts/run.sh hs256,csrfon    >/dev/null && ./scripts/csrf-demo.sh       > docs/output/csrf-vs-permitall.txt 2>&1
+
+echo "==> expiry and clock skew (takes ~70s)"
+./scripts/run.sh hs256,shortlived >/dev/null && ./scripts/expiry-demo.sh    > docs/output/expiry-and-clock-skew.txt 2>&1
+
+echo "==> built-in resource server, without and with the token_type validator"
+./scripts/run.sh hs256,resourceserver >/dev/null \
+  && ./scripts/resource-server-demo.sh http://localhost:8080 "hs256,resourceserver" \
+     > docs/output/resource-server-loose.txt 2>&1
+./scripts/run.sh hs256,resourceserver,strict >/dev/null \
+  && ./scripts/resource-server-demo.sh http://localhost:8080 "hs256,resourceserver,strict" \
+     > docs/output/resource-server-strict.txt 2>&1
+
+for p in $(ps -eo pid,cmd | grep '[J]wtAuthDemoApplication' | awk '{print $1}'); do kill -9 "$p" || true; done
+echo "==> done. docs/output/ regenerated."