Add test for old dao

.travis.yml

@@ -52,6 +52,12 @@ jobs:
  - CMD="++2.13.1 test"
  name: "Run tests with Scala 2.13 and AdoptOpenJDK 11"
 
+ - env:
+ - PRE_CMD="./scripts/launch-all.sh"
+ - _JAVA_OPTIONS="-Djdbc-journal.dao=akka.persistence.jdbc.journal.dao.legacy.ByteArrayJournalDao -Djdbc-snapshot-store.dao=akka.persistence.jdbc.snapshot.dao.legacy.ByteArraySnapshotDao -Djdbc-read-journal.dao=akka.persistence.jdbc.query.dao.legacy.ByteArrayReadJournalDao"
+ - CMD="++2.12.11 test"
+ name: "Run tests with the old DAO"
+
  - stage: whitesource
  script: git branch -f "$TRAVIS_BRANCH" && git checkout "$TRAVIS_BRANCH" && sbt whitesourceCheckPolicies whitesourceUpdate
  name: "Check licenses via WhiteSource"

core/src/main/resources/reference.conf

@@ -165,6 +165,7 @@ jdbc-journal {
  # The tag separator to use when tagging events with more than one tag.
  # should not be configured directly, but through property akka-persistence-jdbc.tagSeparator
  # in order to keep consistent behavior over write/read sides
+ # Only used for the legeacy schema
  tagSeparator = ${akka-persistence-jdbc.tagSeparator}
 
  # If you have data from pre 5.0.0 use the legacy akka.persistence.jdbc.journal.dao.legacy.ByteArrayJournalDao