Mixing Hibernate and a JTA provider may lead to duplicate JTA
dependencies as the API is published with different coordinates.
The following has been applied:
* We now use `javax.transaction:javax.transaction-api` everywhere.
* The `data-jpa` starter has been updated to replace the JBoss JTA
dependency with the standard one.
* The `jta-bitronix` starter has been updated to use JTA 1.2 instead of
JTA 1.1 (unfortunately, JTA 1.1 is published with different
coordinates).
* The `jta-atomikos` starter has been updated to define a dependency on
JTA as the current version does not do it at all.
* The HornetQ JMS server is also relying on JTA but that dependency
should have been optional. It has been excluded for the time being as
it was using (yet) another set of coordinates.
Fixes gh-2092
Unlike the Tomcat and Jetty starters, the Undertow starter does not
provide an EL implementation. This leads to failures when you try to use
Hibernate Validator with the Undertow starter.
To bring the Undertow starter into line with the other two embedded
container starters, this commit adds Glassfish’s EL implementation to
the Undertow starter. This is the implementation that’s used by the
Jetty starter. If/when Undertow provides JSP support and, therefore,
starts using EL itself, we should align with it.
Closes gh-1979
Add a companion module that IDE developers can use to read configuration
metadata from multiple sources into a single repository.
ConfigurationMetadataRepository provides access to groups and items as
well as an harmonized view on "sources" (that is the POJOs that have
contributed to a given group).
Closes gh-1970
hibernate-jpamodelgen was requested by a Boot user. hibernate-ehcache
and hibernate-envers were requested by a Spring IO Platform user (see
spring-io/platform#11
Closes gh-1896
