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The output you have put here states everything you need to solve this issue, including a link to a further explanation. It is not a bug, let alone a blocker, and you should close this issue; it should have been a post to the mailing list at most.
There are two logging implementation jars on your classpath. In this scenario which binding class is used at runtime is undefined; as it happens, the one in slf4j-nop-1.7.5.jar is being chosen on centos 7 and the one in logback-classic-1.0.0.jar is being chosen on centos 6. You have code that assumes the implementation is logback classic, which consequently fails when it is not.