HHH-13043 + HHH-13116 Upgrade to JAXB 2.3

[yrodiere]

https://hibernate.atlassian.net//browse/HHH-13043
https://hibernate.atlassian.net//browse/HHH-13116

I gave up on doing the upgrade for OSGi; it's just too early for that. We don't really have any code that is specific to JAXB 2.3, so tests work fine in karaf, which uses JAXB 2.2 in the classpath. I guess that's good enough for now?

The most important thing is that Maven users will finally be able to use ORM in a JDK11 environment, i.e. HHH-13116 will be fixed.

How to reproduce HHH-13116 and check that it's fixed

Due to the need to use Maven to reproduce HHH-13116, I didn't even try to add a reproducer in ORM itself. If you want to check that it is indeed fixed:

• Clone this PR, go to the corresponding directory
• Publish 5.4.0-SNAPSHOT locally:

  ./gradlew clean publishToMavenLocal -x test
  

• Clone the reproducer from the Hibernate Search repo (it's just a branch with all the necessary commits to upgrade to ORM 5.4 and make Search compatible with JDK11):

  cd $(mktemp -d)
  git clone --depth 50 --no-single-branch https://github.com/yrodiere/hibernate-search.git
  cd hibernate-search
  git checkout --track origin/HHH-13116-reproducer
  

• Build the reproducer:

  mvn clean install -DskipTests -pl :hibernate-search-orm -am
  

• Define the path to your JDK11 home:

  export my_java_home=/path/to/jdk11
  

• Execute the test, showing something doesn't work (this will use ORM 5.4.0.CR1):

  JAVA_HOME=$my_java_home PATH=$my_java_home/bin:$PATH  mvn clean install -pl :hibernate-search-orm -Dtest='SearchAndEnversIntegrationTest'
  

• Upgrade to ORM 5.4.0-SNAPSHOT to benefit from the JAXB upgrade:

  git checkout --track origin/HHH-13116-reproducer-fixed
  

• Launch the test that used to fail:

  JAVA_HOME=$my_java_home PATH=$my_java_home/bin:$PATH  mvn clean install -pl :hibernate-search-orm -Dtest='SearchAndEnversIntegrationTest'
  

[gsmet]

Merged, thanks. Good catch.