serialization: Java serialization companion code (UID drift, JEP 290/415 filters, records, JSON/Protobuf comparison)

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01KqJyCidz3ZgRyHABv2GVJh
2026-09-30 19:03:40 +00:00
parent b31c6716a3
commit 97e7352f45
31 changed files with 867 additions and 0 deletions
@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+# Regenerates every file in ../output/. Requires JDK25_HOME.
+set -euo pipefail
+[[ -z "${JDK25_HOME:-}" ]] && { echo "JDK25_HOME must be set" >&2; exit 1; }
+cd "$(dirname "$0")/.."
+OUT=output; mkdir -p "$OUT"
+export JAVA_HOME="$JDK25_HOME"
+mvn -q -f ../pom.xml -pl serialization -am package 2>&1 | grep -v -E "Picked up|^WARNING" || true
+J="$JDK25_HOME/bin/java"; JC="$JDK25_HOME/bin/javac"
+M2="${HOME}/.m2/repository"
+CP="target/classes:$(ls $M2/tools/jackson/core/jackson-databind/3.2.3/*.jar):$(ls $M2/tools/jackson/core/jackson-core/3.2.3/*.jar):$(ls $M2/com/fasterxml/jackson/core/jackson-annotations/*/*.jar | tail -1):$(ls $M2/com/google/protobuf/protobuf-java/4.36.2/*.jar)"
+run() { f=$1; shift; echo "==> $f"; "$J" "$@" 2>&1 | grep -v "Picked up" > "$OUT/$f"; }
+
+# 01: the UID travels inside the stream
+run 01-uid-in-stream.txt -cp "$CP" com.ankurm.serialization.UidInStreamDemo
+
+# 02/03: two versions of the same class, with and without an explicit serialVersionUID
+for mode in implicit explicit; do
+  rm -rf target/drift-$mode; mkdir -p target/drift-$mode
+  for v in v1 v2; do
+    d=target/drift-$mode/$v/com/ankurm/serialization/drift; mkdir -p $d
+    if [[ $mode == explicit ]]; then
+      sed 's#/\*UID\*/#private static final long serialVersionUID = 1L;#' src/versions/$v/Account.java > $d/Account.java
+    else
+      sed 's#/\*UID\*/##' src/versions/$v/Account.java > $d/Account.java
+    fi
+    cp src/versions/common/*.java $d/
+    $JC -d target/drift-$mode/$v/classes $d/*.java 2>&1 | grep -v "Picked up" || true
+  done
+done
+{
+  echo '$ # implicit serialVersionUID (none declared)'
+  echo '$ java -cp v1 DriftWrite'
+  "$J" -cp target/drift-implicit/v1/classes com.ankurm.serialization.drift.DriftWrite target/account-implicit.ser 2>&1 | grep -v "Picked up"
+  echo '$ java -cp v2 DriftRead   # v2 adds a field'
+  "$J" -cp target/drift-implicit/v2/classes com.ankurm.serialization.drift.DriftRead target/account-implicit.ser 2>&1 | grep -v "Picked up"
+} > "$OUT/02-drift-implicit.txt"
+{
+  echo '$ # explicit serialVersionUID = 1L'
+  echo '$ java -cp v1 DriftWrite'
+  "$J" -cp target/drift-explicit/v1/classes com.ankurm.serialization.drift.DriftWrite target/account-explicit.ser 2>&1 | grep -v "Picked up"
+  echo '$ java -cp v2 DriftRead   # v2 adds a field'
+  "$J" -cp target/drift-explicit/v2/classes com.ankurm.serialization.drift.DriftRead target/account-explicit.ser 2>&1 | grep -v "Picked up"
+} > "$OUT/03-drift-explicit.txt"
+
+run 04-readobject-runs-code.txt -cp "$CP" com.ankurm.serialization.ReadObjectRunsCodeDemo
+run 05-resource-limits.txt -Xmx256m -cp "$CP" com.ankurm.serialization.ResourceLimitsDemo
+run 06-records.txt -cp "$CP" com.ankurm.serialization.RecordsDemo
+{
+  echo '$ java -Djdk.serialFilter="maxdepth=10;com.ankurm.serialization.*;java.lang.*;!*" FilterFactoryDemo'
+  "$J" -Djdk.serialFilter='maxdepth=10;com.ankurm.serialization.*;java.lang.*;!*' -cp "$CP" com.ankurm.serialization.FilterFactoryDemo 2>&1 | grep -v "Picked up"
+} > "$OUT/07-filter-factory.txt"
+run 08-format-sizes.txt -cp "$CP" com.ankurm.serialization.FormatSizeDemo
+echo "==> JMH"
+"$J" -jar target/benchmarks.jar SerializationBenchmark -rf text -rff "$OUT/09-jmh-raw.txt" > /dev/null 2>&1
+cp target/surefire-reports/com.ankurm.serialization.SerializationTest.txt "$OUT/10-tests.txt"
+echo Done