Enhance logger factory resetting

src/main/java/io/gitlab/jfronny/commons/log/Logger.java

@@ -16,7 +16,7 @@ public interface Logger {
     }
 
     static void resetFactory() {
-        LoggerHolder.LOGGER_BUILDER = LoggerHolder.DEFAULT_LOGGER_BUILDER;
+        LoggerHolder.reset();
     }
 
     @Nullable String getName();

src/main/java/io/gitlab/jfronny/commons/log/LoggerHolder.java

@@ -11,9 +11,11 @@ import java.util.function.Function;
 class LoggerHolder {
     public static Function<String, Logger> LOGGER_BUILDER;
 
-    public static final Function<String, Logger> DEFAULT_LOGGER_BUILDER;
-
     static {
+        reset();
+    }
+
+    public static void reset() {
         try {
             Constructor<Logger> constructor = (Constructor<Logger>) Class.forName("io.gitlab.jfronny.commons.log.SLF4JLogger")
                     .getConstructor(String.class);
@@ -22,6 +24,5 @@ class LoggerHolder {
             // SLF4J logger is unavailable, use java.util.logging
             LOGGER_BUILDER = JavaUtilLogger::new;
         }
-        DEFAULT_LOGGER_BUILDER = LOGGER_BUILDER;
     }
 }