There are many avenues to receive help when using the Coherence Spring. Here are a few options.
The Discussion Forums for the Coherence Spring project are the best place to start asking questions - should you need to. These forums are hosted by Oracle and are typically monitored by the community.
They can be found here: https://community.oracle.com/community/fusion_middleware/coherence/coherence_support
As all of the source code, including tests and examples are now published, these are often a great place to start for implementation tips.
The source code is located here: https://github.com/coherence-community/coherence-spring-integration
If you find an issue with the Coherence Spring or have an idea for a new feature the best place to start is with the Issue Tracking System. All issues, both current and past are publicly viewable.
The Issue Tracking System can be found here: https://github.com/coherence-community/coherence-spring/issues