Revisit dependency baseline: Jetty 9.4+, OkHttp 3+ [SPR-15038]

[spring-projects-issues]

Juergen Hoeller opened SPR-15038 and commented

We're still tolerating older dependencies in 5.0 milestones but should eventually raise the baseline for 5.0 GA. In rather obvious cases, we'd gain quite a bit by going Jetty 9.4+ (for WebSocket support) and OkHttp 3+, both of which look entirely feasible in Spring 5.

Another one still up for consideration is Hibernate ORM 5.2+ for our native orm.hibernate5 package, while our JPA support will remain compatible with Hibernate 4.3+ in any case. However, since JBoss EAP 7 still comes with Hibernate ORM 5.0.x, this does not seem feasible yet. We might rather drop the entire native Hibernate API support at some point.

---

Issue Links:

• Require Undertow 1.3.5+, Tyrus 1.11+, Jetty 9.3+, Tomcat 8.5+ [SPR-13495] #18073 Require Undertow 1.3.5+, Tyrus 1.11+, Jetty 9.3+, Tomcat 8.5+
• Deprecate OkHttp 2.x support [SPR-14344] #18916 Deprecate OkHttp 2.x support
• Support for Jetty 9.4 (and 9.3.15+) [SPR-14940] #19507 Support for Jetty 9.4 (and 9.3.15+)
• Support for HtmlUnit 2.25+ [SPR-15319] #19882 Support for HtmlUnit 2.25+