Revert "Logback 1.3 and SLF4J 2.0"

This reverts commit f39a080 that was
pushed prematurely.

Author: wilkinsona

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -813,7 +813,7 @@ bom {
 			]
 		}
 	}
-	library("Logback", "1.3.0-alpha15") {
+	library("Logback", "1.2.11") {
 		group("ch.qos.logback") {
 			modules = [
 				"logback-access",
@@ -1289,7 +1289,7 @@ bom {
 			]
 		}
 	}
-	library("SLF4J", "2.0.0-alpha7") {
+	library("SLF4J", "1.7.36") {
 		group("org.slf4j") {
 			modules = [
 				"jcl-over-slf4j",

spring-boot-project/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/LogbackInitializer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,7 +19,7 @@
 import ch.qos.logback.classic.Level;
 import org.slf4j.ILoggerFactory;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import org.slf4j.impl.StaticLoggerBinder;
 
 import org.springframework.util.ClassUtils;
 
@@ -32,7 +32,7 @@
 public abstract class LogbackInitializer {
 
 	public static void initialize() {
-		if (ClassUtils.isPresent("org.slf4j.LoggerFactory", null)
+		if (ClassUtils.isPresent("org.slf4j.impl.StaticLoggerBinder", null)
 				&& ClassUtils.isPresent("ch.qos.logback.classic.Logger", null)) {
 			new Initializer().setRootLogLevel();
 		}
@@ -41,7 +41,7 @@ public static void initialize() {
 	private static class Initializer {
 
 		void setRootLogLevel() {
-			ILoggerFactory factory = LoggerFactory.getILoggerFactory();
+			ILoggerFactory factory = StaticLoggerBinder.getSingleton().getLoggerFactory();
 			Logger logger = factory.getLogger(Logger.ROOT_LOGGER_NAME);
 			((ch.qos.logback.classic.Logger) logger).setLevel(Level.INFO);
 		}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/LogbackLoggingSystem.java

@@ -39,9 +39,9 @@
 import ch.qos.logback.core.util.StatusListenerConfigHelper;
 import org.slf4j.ILoggerFactory;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 import org.slf4j.Marker;
 import org.slf4j.bridge.SLF4JBridgeHandler;
+import org.slf4j.impl.StaticLoggerBinder;
 
 import org.springframework.boot.logging.AbstractLoggingSystem;
 import org.springframework.boot.logging.LogFile;
@@ -348,7 +348,7 @@ private ch.qos.logback.classic.Logger getLogger(String name) {
 	}
 
 	private LoggerContext getLoggerContext() {
-		ILoggerFactory factory = LoggerFactory.getILoggerFactory();
+		ILoggerFactory factory = StaticLoggerBinder.getSingleton().getLoggerFactory();
 		Assert.isInstanceOf(LoggerContext.class, factory,
 				() -> String.format(
 						"LoggerFactory is not a Logback LoggerContext but Logback is on "