I have to use Java 5 in the my client's environment. And I have problems finding a JGroups version that still runs on Java5. I have found that 2.6.15.GA compiles and runs on Java 5, but it is quite old. 2.12.2.Final does not even compile on Java5 due to usage of new API. But there are several versions in between. Does any of you know since what time JGroups switched to Java 6?
Just reposting @eee comment, because its valid answer:
JGroups 2.5 requires JDK 1.5 or higher. Version 2.9 requires JDK 1.6 or higher. jgroups.org/manual/html_single/index.html#d0e244