spring-boot-demo-oom: five real memory-leak demos with captured OOM + MAT evidence

unbounded-queue-leak/scripts/run.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# Drives unbounded-queue-leak to a REAL java.lang.OutOfMemoryError under a constrained heap, with
+# -XX:+HeapDumpOnOutOfMemoryError so the crash leaves a real .hprof behind. Also regenerates
+# docs/output/01-oom-console.txt from the real run log.
+#
+# Needs JDK 25 (LTS) on PATH.
+set -eu
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+MODULE_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"
+ROOT_DIR="$(cd "$MODULE_DIR/.." && pwd)"
+cd "$MODULE_DIR"
+
+mvn -q -B package -DskipTests
+mkdir -p docs/output
+rm -f docs/output/heap.hprof
+CMD="java -Xmx160m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=docs/output/heap.hprof -jar target/unbounded-queue-leak.jar"
+echo "== running: $CMD =="
+LOG="$(mktemp)"
+$CMD > "$LOG" 2>&1 || true
+python3 "$ROOT_DIR/scripts/extract-oom-console.py" "$MODULE_DIR" "$LOG" "$CMD"
+rm -f "$LOG"
+echo "heap dump: docs/output/heap.hprof (not committed -- see .gitignore; regenerate it with this script)"