[resteasy-dev] ResteasyProviderFactory and the JAX-RS api RuntimeDelegate cache

Hi, while working on the changes for https://issues.jboss.org/browse/RESTEASY-1531 , I figured out that we possibly have a general issue with the javax.ws.rs.ext.RuntimeDelegate cache mechanism. That class basically has a static cachedDelegate which is used to store the first resolved implementation of RuntimeDelegate and offer it to any following request. The problem is that RESTEasy implementation of RuntimeDegate, ResteasyProviderFactory, comes with many data (look at its field members) that relates to a specific application / deployment. Sharing an instance among different application does not seem correct. The ResteasyDeployment class is also setting and clearing that cache value using ResteasyProviderFactory:setInstance and ResteasyProviderFactory: clearInstanceIfEqual methods which I believe results in a mess in-container, with multiple deployments going over others (the clear method is called upon undeployment). The problem seems to be mitigated by the fact that many users simply go and create a new ResteasyProviderFactory using our proprietary api, instead of getting it through standard JAX-RS api. To deal with a similar problem in my branch for RESTEASY-1531 I've basically duplicated the resolution mechanism within RESTEasy and bypassed the cache stuff, but the problem is still there for pure JAX-RS api users. Am I missing something here? Any thoughts / idea? Cheers Alessio