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 3c50362de25617d878ef58f14f67c240005ff624..76aa23da778b0fe8a093429c56cb29b044359b40 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -12,6 +12,8 @@ java {
 val annotationsVersion = "24.1.0"
 val bungeeCordChatVersion = "1.20-R0.2"
 val adventureVersion = "4.17.0"
+val slf4jVersion = "2.0.9"
+val log4jVersion = "2.17.1"
 val apiAndDocs: Configuration by configurations.creating {
     attributes {
         attribute(Category.CATEGORY_ATTRIBUTE, objects.named(Category.DOCUMENTATION))
@@ -47,6 +49,8 @@ dependencies {
     apiAndDocs("net.kyori:adventure-text-serializer-legacy")
     apiAndDocs("net.kyori:adventure-text-serializer-plain")
     apiAndDocs("net.kyori:adventure-text-logger-slf4j")
+    api("org.apache.logging.log4j:log4j-api:$log4jVersion")
+    api("org.slf4j:slf4j-api:$slf4jVersion")
 
     implementation("org.ow2.asm:asm:9.7")
     implementation("org.ow2.asm:asm-commons:9.7")
@@ -140,6 +144,8 @@ tasks.withType<Javadoc> {
         "https://jd.advntr.dev/text-serializer-legacy/$adventureVersion/",
         "https://jd.advntr.dev/text-serializer-plain/$adventureVersion/",
         "https://jd.advntr.dev/text-logger-slf4j/$adventureVersion/",
+        "https://javadoc.io/doc/org.slf4j/slf4j-api/$slf4jVersion/",
+        "https://javadoc.io/doc/org.apache.logging.log4j/log4j-api/$log4jVersion/",
         // Paper end
         "https://javadoc.io/doc/org.apache.maven.resolver/maven-resolver-api/1.7.3", // Paper
     )
diff --git a/src/main/java/org/bukkit/plugin/Plugin.java b/src/main/java/org/bukkit/plugin/Plugin.java
index 68a0ed5f0ed25e98f4ab4d1e482ec2ccfda9cd3a..46fc37a36403c8fbc4c0c9f863d4d57eb3896bd4 100644
--- a/src/main/java/org/bukkit/plugin/Plugin.java
+++ b/src/main/java/org/bukkit/plugin/Plugin.java
@@ -198,6 +198,22 @@ public interface Plugin extends TabExecutor {
     }
     // Paper end
 
+    // 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>