Paper/patches/api/0069-Allow-plugins-to-use-SLF4J-for-logging.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Minecrell <minecrell@minecrell.net>
Date: Thu, 21 Sep 2017 16:33:12 +0200
Subject: [PATCH] Allow plugins to use SLF4J for logging

SLF4J is a commonly used abstraction for various logging frameworks
such as java.util.logging (JUL) or Log4j. Currently, plugins are
required to do all their logging using the provided JUL logger.
This is annoying for plugins that target multiple platforms or when
using libraries that log messages using SLF4J.

Expose SLF4J as optional logging API for plugins, so they can use
it without having to shade it in the plugin and going through
several layers of logging abstraction.

diff --git a/build.gradle.kts b/build.gradle.kts
index 9ec782b00f9f2ac5a38a75667d36de4582a25a03..ac0a4aea48436201b5712b166413bb7dc0d0b9d8 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -38,6 +38,8 @@ dependencies {
     apiAndDocs("net.kyori:adventure-text-serializer-gson")
     apiAndDocs("net.kyori:adventure-text-serializer-legacy")
     apiAndDocs("net.kyori:adventure-text-serializer-plain")
+    api("org.apache.logging.log4j:log4j-api:2.17.1")
+    api("org.slf4j:slf4j-api:1.8.0-beta4")
 
     implementation("org.ow2.asm:asm:9.2")
     implementation("org.ow2.asm:asm-commons:9.2")
diff --git a/src/main/java/org/bukkit/plugin/Plugin.java b/src/main/java/org/bukkit/plugin/Plugin.java
index 03ca87a1cbace2459174bb7bb8847bda766e80c5..34438b5362b0ba0949625d81e8371fe0d1f76fdf 100644
--- a/src/main/java/org/bukkit/plugin/Plugin.java
+++ b/src/main/java/org/bukkit/plugin/Plugin.java
@@ -179,6 +179,22 @@ public interface Plugin extends TabExecutor {
     @NotNull
     public Logger getLogger();
 
+    // Paper start - Add SLF4J/Log4J loggers
+    @NotNull
+    default org.slf4j.Logger getSLF4JLogger() {
+        return org.slf4j.LoggerFactory.getLogger(getLogger().getName());
+    }
+
+    /**
+     * @deprecated use {@link #getSLF4JLogger()}
+     */
+    @Deprecated
+    @NotNull
+    default org.apache.logging.log4j.Logger getLog4JLogger() {
+        return org.apache.logging.log4j.LogManager.getLogger(getLogger().getName());
+    }
+    // Paper end
+
     /**
      * Returns the name of the plugin.
      * <p>