Add json-columns module: JSON columns in Hibernate 7.4.14 (@JdbcTypeCode(SqlTypes.JSON)), JSONB querying, GIN/expression indexes, dirty checking, Jackson 3 vs 2 on PostgreSQL 18.6 and MySQL 8.0.46

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b6Kg9RWSTJzyz6KP9X

json-columns/scripts/format-mapper-matrix.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+# Runs FormatMapperProbe under five classpaths and writes output/09-format-mapper-matrix.txt.
+# Needs PostgreSQL up (scripts/start-databases.sh) and `mvn test-compile` done.
+set -uo pipefail
+cd "$(dirname "$0")/.."
+OUT=output/09-format-mapper-matrix.txt
+mkdir -p output target/cp
+mvn -B -q test-compile >/dev/null 2>&1
+cp_for() { # name, extra mvn args...
+  local name="$1"; shift
+  mvn -B -q dependency:build-classpath -Dmdep.includeScope=test -Dmdep.outputFile="target/cp/$name.txt" "$@" >/dev/null 2>&1
+}
+drop() { tr ':' '\n' < "target/cp/$1.txt" | grep -v -E "$2" | paste -sd: - > "target/cp/$3.txt"; }
+cp_for j3                      # Jackson 3 only: what Spring Boot 4 gives you
+cp_for j2j3 -Pjackson2         # Jackson 2 and Jackson 3 side by side
+cp_for j2j3t -Pjackson2,jsr310 # ... plus jackson-datatype-jsr310 for Jackson 2
+drop j2j3 '/tools/jackson/' j2                           # Jackson 2 only
+drop j2j3t '/tools/jackson/' j2t                         # Jackson 2 only, with jsr310
+drop j3 '/tools/jackson/|/com/fasterxml/jackson/' none   # no Jackson at all
+run() { # label, classpath-name, setting
+  local label="$1" cpname="$2" setting="${3:-}"
+  echo "== $label"
+  java -cp "target/test-classes:target/classes:$(cat target/cp/$cpname.txt)" com.ankurm.jsoncolumns.FormatMapperProbe "$setting" 2>&1 \
+    | grep -E '^(setting|on classpath|mapper|stored|read back|FAILED)'
+  echo
+}
+{
+  echo "# Hibernate $(grep -o 'hibernate-core-[0-9.A-Za-z]*' target/cp/j3.txt | head -1)"
+  run "A. Jackson 3 only, setting not set"                 j3
+  run "B. Jackson 2 + Jackson 3, setting not set"          j2j3
+  run "C. Jackson 2 only, setting not set"                 j2
+  run "D. no Jackson at all, setting not set"              none
+  run "E. Jackson 2 + Jackson 3, setting = jackson (Jackson 2)" j2j3 jackson
+  run "F. Jackson 3 only, setting = jackson (Jackson 2 absent)" j3 jackson
+  run "G. Jackson 2 + Jackson 3, setting = jackson3"       j2j3 jackson3
+  run "H. Jackson 2 + jackson-datatype-jsr310, setting not set"  j2t
+  run "I. Jackson 2 + Jackson 3 + jsr310, setting not set"  j2j3t
+} > "$OUT"
+cat "$OUT"