code: private boolean hasSlf4jBinding(File file) throws MojoExecutionException {
          try (JarFile jarFile = new JarFile(file)){
              return jarFile.getEntry("org/slf4j/impl/StaticLoggerBinder.class") != null;
          } catch (IOException e) {
              throw new MojoExecutionException(e.getMessage(), e);
          }
      }
docs: Returns true if the given jar file contains an SLF4J binding
  @param file the file
  @return true if the jar file contains an SLF4J binding