PaperMC/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 d8d459561cc75935136f8f9888ff27b45ad98f9e..001c2b963205012f340db0d539e4033c748124ce 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>