How to solve the unknown error when using slf4j in Java

In batch, log is the life, I want to use Slf4j, so download the zip.

From adding an external jar Add only slf4j-api-1.7.25.jar to java

public class HogeMain {
  public static void main(String args[]){

When I write and execute, the following error

   SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
   SLF4J: Defaulting to no-operation (NOP) logger implementation
   SLF4J: See for further details.

Adding slf4j-simple-1.7.25.jar will fix it.

By the way, if you get this error, you probably added an unnecessary jar.

NoClassDefFoundError: android/util/Log

slf4j-api-1.7.25.jar slf4j-simple-1.7.25.jar If you just want to log to java, just these two jars worked for the time being

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