Add migration-17-25 module: Java 17 class files run on 17 and 25, flags, removed APIs, jdeps and jdeprscan

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Gth99spB1CzQmBFofXmU4Z

migration-17-25/scripts/flags.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+# Which JVM options from Java 17-era startup scripts still work? Runs `java <flag> -version` on both JDKs; records exit code and first warning/error line.
+J17=${JDK17:-/tmp/tools/j17}; J25=${JDK25:-/tmp/tools/jdk-25.0.4.1+1}
+echo "# flag | JDK 17 | JDK 25   (exit code: first warning or error line)"
+for f in -Djava.security.manager=allow -XX:+UseBiasedLocking -XX:+UseConcMarkSweepGC -XX:+AggressiveOpts -XX:MaxPermSize=128m -XX:+UseParallelOldGC -Xverify:none -XX:-UseCompressedClassPointers -XX:+ParallelRefProcEnabled -XX:+UseStringDeduplication; do
+  line="$f |"
+  for j in "$J17" "$J25"; do
+    all=$("$j/bin/java" $f -version 2>&1); rc=$?
+    msg=$(echo "$all" | grep -E 'Unrecognized|warning|Error' | head -1 | sed 's/^OpenJDK 64-Bit Server VM warning: //' | cut -c1-120)
+    [ -z "$msg" ] && msg="(no message)"
+    line="$line exit $rc: $msg |"
+  done
+  echo "${line% |}"
+done