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Message: [QUOTE="markspace, post: 4064333"] Just a note, in case you missed it: I didn't put the Cache inside of Demo, all I did was add a type parameter to Cache. I think, given what you've shown us, you either have to remove the T type information from the return types in Cache (if you don't have a type, how can you guarantee that two different method calls actually correlate in their type? That's why the ? is messing you up), or you have to parameterize Cache, as I did, so the compiler can check your work. Also, I didn't modify any other code. Your program appears to me to be correct, so you could add a SupperssWarnings to the return type. But it might be better not to: There's always maintenance to consider, and keeping that SupperssWarnings valid through many code revisions, possibly not done by you, might not be easy or even possible. [/QUOTE]