SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See for further details.
  • This is because the SLF4J APIs are on the classpath, but an implementation is not.
  • Add an implementation, e.g.:
    • org.slf4j:slf4j-simple:1.7.25. This “simple” implementation just outputs all events to System.err, and ignores anything lower than INFO level.
    • org.slf4j:slf4j-jdk14:1.7.25. This uses java.util.logging, also known as JDK 1.4 Logging.