I put my money on Spring, Hibernate, JBoss lasting longer than Scala, Akka etc.
Those technologies have stayed on, while other trends have come and and go.
Those technologies have stayed on, while other trends have come and and go.
I put my money on TypeSafe.
Pivotal still (05/2014) doesn't have Java8 support for some of it's frameworks (grails https://jira.grails.org/browse/GRAILS-11063 ). TypeSafe pre-released versions of Play that take full advantage of Java8 features.
Given that if you need to run a Java 1.4.2 app on top of JBoss (or Glassfish!) then the types of technologies that these two companies are pushing are solving problems in a different domain.
And arguably the PermGen change in Java8 would benefit Grails/Groovy the most.