Build and test against JPA 2.2 and EclipseLink 2.7 (while retaining compatibility with JPA 2.1)
Build and test against JPA 2.2 and EclipseLink 2.7 (while retaining compatibility with JPA 2.1)

Includes latest dependency updates (Tomcat 8.5.20, Protobuf 3.4, RxJava 2.1.3, Caffeine 2.5.5)

Issue: SPR-15870

spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework