Add multi-datasource module: two databases with per-database DataSource, Flyway, EntityManagerFactory and transaction manager on Boot 4.1

Working setup plus one small application per way of getting it wrong (no @Primary, @Primary only, url vs jdbc-url, wrong repository package, Flyway auto-configuration), plain vs named @Transactional, and ChainedTransactionManager with a failing commit. Transcripts are written by the tests. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Uu7q8vPeREyT4218EJPzz1
2026-09-24 09:38:27 +00:00
parent d6b76c57db
commit e59ff029a1
44 changed files with 1465 additions and 0 deletions
@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+# Facts that a test cannot observe, read straight out of the jars on the classpath.
+#   10-chained-transaction-manager-jar.txt   is ChainedTransactionManager still shipped, and is it deprecated?
+#   11-enable-jpa-repositories-not-repeatable.txt   what javac says about two @EnableJpaRepositories on one class
+#   12-builder-packages.txt   how EntityManagerFactoryBuilder.Builder.packages(Class...) turns classes into packages
+set -euo pipefail
+cd "$(dirname "$0")/.."
+mkdir -p output target
+mvn -B -q dependency:build-classpath -Dmdep.outputFile=target/classpath.txt >/dev/null
+CP="$(cat target/classpath.txt)"
+
+commons="$(tr ':' '\n' < target/classpath.txt | grep 'spring-data-commons' | head -1)"
+{
+  echo "# Is org.springframework.data.transaction.ChainedTransactionManager still shipped, and is it deprecated?"
+  echo
+  echo "jar:      $(basename "$commons")"
+  echo "class:    $(unzip -l "$commons" | awk '{print $4}' | grep 'transaction/ChainedTransactionManager.class')"
+  echo
+  echo "--- javap -v: class-level annotations ---"
+  javap -v -cp "$commons" org.springframework.data.transaction.ChainedTransactionManager \
+    | awk '/^RuntimeVisibleAnnotations:/{p=1} p{print} /^BootstrapMethods:/{p=0}' | sed '/^BootstrapMethods:/,$d'
+  echo "--- javap -v: Deprecated attribute ---"
+  javap -v -cp "$commons" org.springframework.data.transaction.ChainedTransactionManager | grep -E '^Deprecated:'
+} > output/10-chained-transaction-manager-jar.txt
+
+{
+  echo "# javac on a class carrying two @EnableJpaRepositories (scripts/facts/RepeatedEnable.java)"
+  echo
+  javac -proc:none -d target/facts -cp "$CP" scripts/facts/RepeatedEnable.java 2>&1 | grep -v "^Picked up" | sed "s|scripts/facts/||" || true
+} > output/11-enable-jpa-repositories-not-repeatable.txt
+
+boot_jpa="$(tr ':' '\n' < target/classpath.txt | grep 'spring-boot-jpa-' | head -1)"
+{
+  echo "# What does EntityManagerFactoryBuilder.Builder.packages(Class...) do with the classes it is given?"
+  echo
+  echo "jar: $(basename "$boot_jpa")"
+  echo
+  echo "--- javap -c: the calls made inside packages(java.lang.Class<?>...) ---"
+  javap -c -p -cp "$boot_jpa" 'org.springframework.boot.jpa.EntityManagerFactoryBuilder$Builder' 2>&1 \
+    | grep -v '^Picked up' \
+    | awk '/packages\(java.lang.Class<\?>\.\.\.\);/{p=1} p&&/^$/{p=0} p' \
+    | grep -E 'invoke' | sed 's/^ *[0-9]*: *//'
+} > output/12-builder-packages.txt
+
+cat output/10-chained-transaction-manager-jar.txt output/11-enable-jpa-repositories-not-repeatable.txt output/12-builder-packages.txt