[infinispan-dev] Multiple Spring modules

Hey! Currently I'm working on Spring 3 and 4 support and because these versions are not compatible (in terms of Cache API), we probably would need to have 2 modules for Spring. Now the question is - how to maintain them? Here are the options which comes into my mind: 1. Create copy of Spring 3 module and put everything into newly created Spring 4, then update versions and implement new methods in Cache interface. Pros: - 1 OSGi bundle - transparent upgrade - just replace spring bundle - Easy to maintain Spring 4 only fixes Cons: - Code duplication 2. Extract common part and create 2 modules which depend on it - very hard because Cache interface is logically at the bottom of the structure. Everything depends on it. Pros: - No code duplication Cons: - Increased code complexity - 2 bundles needed - common + spring 3/4 3. Make Spring 4 module depend on Spring 3 and replace Cache implementations, run Maven Shade plugin to put everything together Pros: - No code duplication Cons: - Hacking into code, no intuitive design - Will probably work in this specific case, further maintenance might be hard. 4. Implement 2 missing methods in Spring module without @override annotation. This way it should work against Spring 3 and 4 Pros: - Really small change and single jar will support both spring 3 and 4 Cons: - Spring version ranges in pom (not sure if it fits into Infinispan design and BOMs) - Not intuitive I like option #1 - much easier maintenance + we might start using Spring 4 features without breaking Spring 3 module. Option #4 is also not that bad... Which option would you prefer? Best regards Sebastian