Refine `RedisSerializer` implementations

[spring-projects-issues]

Markus Heiden opened DATAREDIS-521 and commented

Jackson2JsonRedisSerializer#serialize(Object) should be Jackson2JsonRedisSerializer#serialize(T). Jackson2JsonRedisSerializer implements RedisSerializer<T> which defines the method as serialize(T). I do not understand why this compiles at all.

The current state makes it impossible to overwrite the method

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Affects: 1.7.1 (Hopper SR1)

[mp911de]

Jackson2JsonRedisSerializer.serialize(T) compiles to serialize(Object). We took this opportunity to polish up our code a bit.