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Add aot-cache module: the JDK 25 AOT cache on Spring Boot 4.1 vs AppCDS, Spring AOT and GraalVM native

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A Spring Boot 4.1.1 order service started 12 ways (plain and extracted jar, Spring AOT output, AppCDS, AOT cache trained with and without traffic, JDK 27, native image), ten interleaved rounds each, with first-request latency; 24 cache-mismatch cases; Docker layer arithmetic. Transcripts are in output/ (no docs/ folder).

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
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Claude
2026-09-24 16:44:16 +00:00
parent fa4205f631
commit 3e2029ab3a
30 changed files with 1023 additions and 1 deletions
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aot-cache/scripts/train.sh
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#!/usr/bin/env bash
# The training runs: one per cache flavour. Prints how long each took, how big the artifact is, and what the
# JVM logged at warning level while writing it. Needs scripts/prepare.sh to have run.
source "$(dirname "$0")/lib.sh"
exercise() { # the traffic a "real" training run sends: success, validation failure, 404, actuator
for i in 1 2 3 4 5; do post_order >/dev/null; done
get_order >/dev/null
curl -s -o /dev/null -H 'Content-Type: application/json' -d '{"customer":"bad","sku":"x","quantity":0}' "localhost:$PORT/orders"
curl -s -o /dev/null "localhost:$PORT/orders/99"
curl -s -o /dev/null "localhost:$PORT/actuator/health"
}
report() { # label file t0
printf '%-34s %6d ms %s (%s MB)\n' "$1" $(( $(now_ms) - $3 )) "$(basename "$2")" "$(( $(stat -c %s "$2") / 1048576 ))"
}
echo "# training runs (JDK 25.0.4.1 unless noted); wall time includes JVM start, context start and cache creation"
t0=$(now_ms)
( cd "$WORK/ext" && "$JDK25/bin/java" -XX:ArchiveClassesAtExit="$WORK/appcds.jsa" -Dspring.context.exit=onRefresh -jar app.jar ) > "$WORK/train-appcds.log" 2>&1
report "AppCDS (ArchiveClassesAtExit)" "$WORK/appcds.jsa" $t0
t0=$(now_ms)
"$JDK25/bin/java" -XX:AOTCacheOutput="$WORK/fat.aot" -Dspring.context.exit=onRefresh -jar "$WORK/app.jar" > "$WORK/train-fat.log" 2>&1
report "AOT cache, fat jar, context-only" "$WORK/fat.aot" $t0
t0=$(now_ms)
( cd "$WORK/ext" && "$JDK25/bin/java" -XX:AOTCacheOutput="$WORK/refresh.aot" -Dspring.context.exit=onRefresh -jar app.jar ) > "$WORK/train-refresh.log" 2>&1
report "AOT cache, context-only training" "$WORK/refresh.aot" $t0
t0=$(now_ms)
start_app "$WORK/ext" "$WORK/train-traffic.log" "$JDK25/bin/java" -XX:AOTCacheOutput="$WORK/traffic.aot" -jar app.jar --server.port=$PORT
wait_ready && exercise
kill -TERM "$APP_PID"; wait "$APP_PID" 2>/dev/null
report "AOT cache, traffic training" "$WORK/traffic.aot" $t0
t0=$(now_ms)
( cd "$WORK/ext-springaot" && "$JDK25/bin/java" -Dspring.aot.enabled=true -XX:AOTCacheOutput="$WORK/springaot.aot" -Dspring.context.exit=onRefresh -jar app.jar ) > "$WORK/train-springaot.log" 2>&1
report "AOT cache + Spring AOT, context-only" "$WORK/springaot.aot" $t0
t0=$(now_ms)
start_app "$WORK/ext-springaot" "$WORK/train-springaot-traffic.log" "$JDK25/bin/java" -Dspring.aot.enabled=true -XX:AOTCacheOutput="$WORK/springaot-traffic.aot" -jar app.jar --server.port=$PORT
wait_ready && exercise
kill -TERM "$APP_PID"; wait "$APP_PID" 2>/dev/null
report "AOT cache + Spring AOT, traffic" "$WORK/springaot-traffic.aot" $t0
t0=$(now_ms)
( cd "$WORK/ext" && "$JDK27/bin/java" -XX:AOTCacheOutput="$WORK/refresh27.aot" -Dspring.context.exit=onRefresh -jar app.jar ) > "$WORK/train-refresh27.log" 2>&1
report "AOT cache on JDK 27, context-only" "$WORK/refresh27.aot" $t0
t0=$(now_ms)
( cd "$WORK/ext" && "$JDK27/bin/java" -XX:+UseZGC -XX:AOTCacheOutput="$WORK/zgc27.aot" -Dspring.context.exit=onRefresh -jar app.jar ) > "$WORK/train-zgc27.log" 2>&1
report "AOT cache on JDK 27, trained under ZGC" "$WORK/zgc27.aot" $t0
echo
echo "# what the JVM said at warning level while writing the context-only AOT cache (count, then the distinct kinds)"
grep -c '\[warning\]\[aot\]' "$WORK/train-refresh.log" | sed 's/^/warning lines: /'
grep '\[warning\]\[aot\]' "$WORK/train-refresh.log" | sed -E 's/^\[[0-9.]+s\]//; s/(Skipping) [^ ]+:/\1 <class>:/' | sort | uniq -c | sort -rn | head -5