Merge branch '52-stable'

* 52-stable:
  [ci] mariadb 10.1 won't install but 10.3 does
  [ci] added install piece caused to skip bundle install
  [ci] back to Xenial as it only support Java 9+
  [ci] re-organize + attempt fixing mariadb install
  [ci] let's try Bionic - MariaDB addon fails on Xenial
  [ci] build all branches + fix duplicate addons:
  [mysql] future proof supported jdbc driver versions

Author: kares

.travis.yml

@@ -1,20 +1,27 @@
-language: ruby
 sudo: false
+dist: xenial
+
 services:
   - mysql
 addons:
-  postgresql: 9.6
-branches:
-  only:
-  - master
-  - /.*-stable$/
-  - /^test-.*/
-  - /maintenance|support/
-  - /.*dev$/
-bundler_args: --without development
-script: bundle exec rake ${TEST_PREFIX}test_$DB
+  postgresql: 9.4
+
 before_install:
   - unset _JAVA_OPTIONS
+  - rvm @default,@global do gem uninstall bundler -a -x -I || true
+  - gem install bundler -v "~>1.17.3"
+install:
+- bundle install --retry 3 --without development
+# to fix this issue: https://travis-ci.community/t/mariadb-10-1-fails-to-install-on-xenial/3151/3
+- mysql -u root -e 'CREATE USER IF NOT EXISTS travis@localhost; GRANT ALL ON *.* TO travis@localhost;' || true
+
+language: ruby
+rvm:
+  - jruby-9.2.7.0
+jdk:
+  - openjdk8
+
+script: bundle exec rake ${TEST_PREFIX}test_$DB
 before_script:
   - echo "JAVA_OPTS=$JAVA_OPTS"
   - export JRUBY_OPTS="-J-Xms64M -J-Xmx1024M"
@@ -40,10 +47,7 @@ before_script:
     psql  -c "create database activerecord_unittest;" -U postgres && \
     psql  -c "create database activerecord_unittest2;" -U postgres \
     || true
-rvm:
-  - jruby-9.2.7.0
-jdk:
-  - openjdk8
+
 env:
   global:
     - AR_VERSION="6-0-stable"
@@ -96,10 +100,10 @@ matrix:
 
     # testing against MariaDB
     - addons:
-        mariadb: '10.0'
+        mariadb: 10.2
       env: DB=mariadb PREPARED_STATEMENTS=false
     - addons:
-        mariadb: '10.1'
+        mariadb: 10.3
       env: DB=mariadb PREPARED_STATEMENTS=true
 
     # Rails test-suite :

activerecord-jdbcmysql-adapter/activerecord-jdbcmysql-adapter.gemspec

@@ -19,5 +19,5 @@ Gem::Specification.new do |gem|
   gem.files = `git ls-files`.split("\n") # assuming . working directory
 
   gem.add_dependency 'activerecord-jdbc-adapter', "#{version}"
-  gem.add_dependency 'jdbc-mysql', '~> 5.1.36' #, '< 8'
+  gem.add_dependency 'jdbc-mysql', '~> 5.1.36', '< 9'
 end