Are SLF4J versions backward compatible?
With rare theoretical exceptions, SLF4J versions are backward compatible. This means than you can upgrade from SLF4J version 1.0 to any later version without problems. However, while the SLF4J API is very stable from the client’s perspective, SLF4J bindings such as slf4j-simple or slf4j-log4j12 may require a specific version of slf4j-api. Mixing different versions of slf4j artifacts can be problematic and is strongly discouraged. For instance, if you are using slf4j-api-1.5.6.jar, then you should also use slf4j-simple-1.5.6.jar, using slf4j-simple-1.4.2.jar will not work. At initialization time, if SLF4J suspects that there may be a version mismatch problem, it emits a warning about the said mismatch. For the exact details of the version mismatch detection mechanism, please refer to the relevant entry in this FAQ.
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