[jboss-as7-dev] Using Guava in a subsystem

Hi all, during a pull request[1] review James brought to my attention that a change I was about to make to the Weld subsystem would introduce a dependency on Guava. Since I consider Guava to be a useful library it surprised me to find out that it is not used anywhere in the JBoss AS / WildFly codebase. Is this intentional or did just nobody happen to use it in the codebase before? Guava itself is used a lot in Weld core. Therefore, using Guava in a subsystem does not have any implications on the size of the JBoss AS / WildFly build as Guava needs to be bundled anyway. Still, if there are any guidelines or conventions on which libraries to use / avoid, please point me to them. Even better, if there is an alternative to Guava's LoadingCache I could use within JBoss AS / WildFly codebase please let me know. Thanks, Jozef [1] https://github.com/jbossas/jboss-as/pull/4417