Merge remote-tracking branch 'FabricMC/dev/0.8' into dev/0.8

# Conflicts:
#	.github/workflows/test-push.yml
#	build.gradle
#	settings.gradle
#	src/test/groovy/net/fabricmc/loom/test/integration/dependencyResolutionManagement.groovy

9 files changed, 261 insertions, 108 deletions

diff --git a/src/main/java/net/fabricmc/loom/LoomGradlePlugin.java b/src/main/java/net/fabricmc/loom/LoomGradlePlugin.java
index 03201907..4b171024 100644
--- a/src/main/java/net/fabricmc/loom/LoomGradlePlugin.java
+++ b/src/main/java/net/fabricmc/loom/LoomGradlePlugin.java
@@ -33,9 +33,10 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.collect.ImmutableMap;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
-import org.gradle.api.Plugin;
 import org.gradle.api.Project;
+import org.gradle.api.plugins.PluginAware;
 
+import net.fabricmc.loom.bootstrap.BootstrappedPlugin;
 import net.fabricmc.loom.configuration.CompileConfiguration;
 import net.fabricmc.loom.configuration.FabricApiExtension;
 import net.fabricmc.loom.configuration.MavenPublication;
@@ -44,12 +45,20 @@ import net.fabricmc.loom.configuration.providers.mappings.MappingsCache;
 import net.fabricmc.loom.decompilers.DecompilerConfiguration;
 import net.fabricmc.loom.task.LoomTasks;
 
-public class LoomGradlePlugin implements Plugin<Project> {
+public class LoomGradlePlugin implements BootstrappedPlugin {
 	public static boolean refreshDeps;
 	public static final Gson GSON = new GsonBuilder().setPrettyPrinting().create();
 	public static final ObjectMapper OBJECT_MAPPER = new ObjectMapper().configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
 
 	@Override
+	public void apply(PluginAware target) {
+		target.getPlugins().apply(LoomRepositoryPlugin.class);
+
+		if (target instanceof Project project) {
+			apply(project);
+		}
+	}
+
 	public void apply(Project project) {
 		String loomVersion = LoomGradlePlugin.class.getPackage().getImplementationVersion();
 		Set<String> loggedVersions = new HashSet<>(Arrays.asList(System.getProperty("loom.printed.logged", "").split(",")));
diff --git a/src/main/java/net/fabricmc/loom/LoomRepositoryPlugin.java b/src/main/java/net/fabricmc/loom/LoomRepositoryPlugin.java
new file mode 100644
index 00000000..5ea09a12
--- /dev/null
+++ b/src/main/java/net/fabricmc/loom/LoomRepositoryPlugin.java
@@ -0,0 +1,200 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom;
+
+import java.io.File;
+
+import org.gradle.api.Plugin;
+import org.gradle.api.Project;
+import org.gradle.api.artifacts.dsl.RepositoryHandler;
+import org.gradle.api.artifacts.repositories.IvyArtifactRepository;
+import org.gradle.api.initialization.Settings;
+import org.gradle.api.invocation.Gradle;
+import org.gradle.api.plugins.PluginAware;
+
+public class LoomRepositoryPlugin implements Plugin<PluginAware> {
+	@Override
+	public void apply(PluginAware target) {
+		RepositoryHandler repositories = null;
+
+		if (target instanceof Settings settings) {
+			repositories = settings.getDependencyResolutionManagement().getRepositories();
+
+			// leave a marker so projects don't try to override these
+			settings.getGradle().getPluginManager().apply(LoomRepositoryPlugin.class);
+		} else if (target instanceof Project project) {
+			if (project.getGradle().getPlugins().hasPlugin(LoomRepositoryPlugin.class)) {
+				return;
+			}
+
+			repositories = project.getRepositories();
+		} else if (target instanceof Gradle) {
+			return;
+		} else {
+			throw new IllegalArgumentException("Expected target to be a Project or Settings, but was a " + target.getClass());
+		}
+
+		Cache cache = new Cache(target);
+
+		// MavenConfiguration.java
+		repositories.flatDir(repo -> {
+			repo.setName("UserLocalCacheFiles");
+			repo.dir(cache.getRootBuildCache());
+		});
+		repositories.maven(repo -> {
+			repo.setName("UserLocalRemappedMods");
+			repo.setUrl(cache.getRemappedModCache());
+		});
+		repositories.maven(repo -> {
+			repo.setName("Fabric");
+			repo.setUrl("https://maven.fabricmc.net/");
+		});
+		repositories.maven(repo -> {
+			repo.setName("Mojang");
+			repo.setUrl("https://libraries.minecraft.net/");
+		});
+		repositories.mavenCentral();
+
+		// MinecraftMappedProvider.java
+		repositories.ivy(repo -> {
+			repo.setUrl(cache.getUserCache());
+			repo.patternLayout(layout -> {
+				layout.artifact("[revision]/[artifact]-[revision](-[classifier])(.[ext])");
+			});
+			repo.metadataSources(IvyArtifactRepository.MetadataSources::artifact);
+		});
+
+		// MinecraftProcessedProvider.java
+		repositories.ivy(repo -> {
+			repo.setUrl(cache.getRootPersistentCache());
+			repo.patternLayout(layout -> {
+				layout.artifact("[revision]/[artifact]-[revision](-[classifier])(.[ext])");
+			});
+			repo.metadataSources(IvyArtifactRepository.MetadataSources::artifact);
+		});
+	}
+}
+
+final class Cache {
+	private PluginAware target;
+
+	Cache(PluginAware target) {
+		if (target instanceof Project || target instanceof Settings) {
+			this.target = target;
+		} else {
+			throw new IllegalArgumentException("Expected target to be a Project or Settings, but was a " + target.getClass());
+		}
+	}
+
+	File getUserCache() {
+		File gradleUserHomeDir = null;
+
+		if (target instanceof Settings settings) {
+			gradleUserHomeDir = settings.getGradle().getGradleUserHomeDir();
+		} else if (target instanceof Project project) {
+			gradleUserHomeDir = project.getGradle().getGradleUserHomeDir();
+		} else {
+			throw new IllegalArgumentException("Expected target to be a Project or Settings, but was a " + target.getClass());
+		}
+
+		File userCache = new File(gradleUserHomeDir, "caches" + File.separator + "fabric-loom");
+
+		if (!userCache.exists()) {
+			userCache.mkdirs();
+		}
+
+		return userCache;
+	}
+
+	public File getRootPersistentCache() {
+		File rootDir = null;
+
+		if (target instanceof Settings settings) {
+			rootDir = settings.getRootDir();
+		} else if (target instanceof Project project) {
+			rootDir = project.getRootDir();
+		} else {
+			throw new IllegalArgumentException("Expected target to be a Project or Settings, but was a " + target.getClass());
+		}
+
+		File persistentCache = new File(rootDir, ".gradle" + File.separator + "loom-cache");
+
+		if (!persistentCache.exists()) {
+			persistentCache.mkdirs();
+		}
+
+		return persistentCache;
+	}
+
+	public File getRootBuildCache() {
+		File rootDir = null;
+
+		if (target instanceof Settings settings) {
+			rootDir = settings.getRootDir();
+		} else if (target instanceof Project project) {
+			rootDir = project.getRootDir();
+		} else {
+			throw new IllegalArgumentException("Expected target to be a Project or Settings, but was a " + target.getClass());
+		}
+
+		File buildCache = new File(rootDir, "build" + File.separator + "loom-cache");
+
+		if (!buildCache.exists()) {
+			buildCache.mkdirs();
+		}
+
+		return buildCache;
+	}
+
+	public File getRemappedModCache() {
+		File remappedModCache = new File(getRootPersistentCache(), "remapped_mods");
+
+		if (!remappedModCache.exists()) {
+			remappedModCache.mkdir();
+		}
+
+		return remappedModCache;
+	}
+
+	public File getNestedModCache() {
+		File nestedModCache = new File(getRootPersistentCache(), "nested_mods");
+
+		if (!nestedModCache.exists()) {
+			nestedModCache.mkdir();
+		}
+
+		return nestedModCache;
+	}
+
+	public File getNativesJarStore() {
+		File natives = new File(getUserCache(), "natives/jars");
+
+		if (!natives.exists()) {
+			natives.mkdirs();
+		}
+
+		return natives;
+	}
+}
diff --git a/src/main/java/net/fabricmc/loom/build/nesting/NestedDependencyProvider.java b/src/main/java/net/fabricmc/loom/build/nesting/NestedDependencyProvider.java
index 8de3103e..60640cb6 100644
--- a/src/main/java/net/fabricmc/loom/build/nesting/NestedDependencyProvider.java
+++ b/src/main/java/net/fabricmc/loom/build/nesting/NestedDependencyProvider.java
@@ -32,7 +32,8 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Locale;
 import java.util.Set;
-import java.util.stream.Collectors;
+
+import javax.annotation.Nullable;
 
 import com.google.gson.JsonObject;
 import org.apache.commons.io.FileUtils;
@@ -42,7 +43,6 @@ import org.gradle.api.artifacts.Configuration;
 import org.gradle.api.artifacts.Dependency;
 import org.gradle.api.artifacts.DependencySet;
 import org.gradle.api.artifacts.ProjectDependency;
-import org.gradle.api.artifacts.ResolvedArtifact;
 import org.gradle.api.artifacts.ResolvedConfiguration;
 import org.gradle.api.artifacts.ResolvedDependency;
 import org.gradle.api.tasks.bundling.AbstractArchiveTask;
@@ -103,17 +103,17 @@ public final class NestedDependencyProvider implements NestedJarProvider {
 
 				visited.add(dependency.getGroup() + ":" + dependency.getName() + ":" + dependency.getVersion());
 
-				// TODO change this to allow just normal jar tasks, so a project can have a none loom sub project
 				Collection<Task> remapJarTasks = dependencyProject.getTasksByName("remapJar", false);
 				Collection<Task> jarTasks = dependencyProject.getTasksByName("jar", false);
 
 				for (Task task : remapJarTasks.isEmpty() ? jarTasks : remapJarTasks) {
-					if (task instanceof RemapJarTask remapJarTask) {
-						File file = remapJarTask.getArchiveFile().get().getAsFile();
-						fileList.add(new DependencyInfo<>(projectDependency, new ProjectDependencyMetaExtractor(), file));
-					} else if (task instanceof AbstractArchiveTask abstractArchiveTask) {
-						File file = abstractArchiveTask.getArchiveFile().get().getAsFile();
-						fileList.add(new DependencyInfo<>(projectDependency, new ProjectDependencyMetaExtractor(), file));
+					if (task instanceof AbstractArchiveTask abstractArchiveTask) {
+						fileList.add(new DependencyInfo<>(
+								projectDependency,
+								new ProjectDependencyMetaExtractor(),
+								abstractArchiveTask.getArchiveFile().get().getAsFile(),
+								abstractArchiveTask.getArchiveClassifier().getOrNull()
+						));
 					}
 				}
 			}
@@ -133,14 +133,13 @@ public final class NestedDependencyProvider implements NestedJarProvider {
 				continue;
 			}
 
-			List<File> files = dependency
-					.getModuleArtifacts()
-					.stream()
-					.map(ResolvedArtifact::getFile)
-					.collect(Collectors.toList());
-
-			for (File file : files) {
-				fileList.add(new DependencyInfo<>(dependency, new ResolvedDependencyMetaExtractor(), file));
+			for (var artifact : dependency.getModuleArtifacts()) {
+				fileList.add(new DependencyInfo<>(
+						dependency,
+						new ResolvedDependencyMetaExtractor(),
+						artifact.getFile(),
+						artifact.getClassifier()
+				));
 			}
 		}
 
@@ -195,7 +194,12 @@ public final class NestedDependencyProvider implements NestedJarProvider {
 
 		JsonObject jsonObject = new JsonObject();
 		jsonObject.addProperty("schemaVersion", 1);
-		jsonObject.addProperty("id", (metaExtractor.group(dependency) + "_" + metaExtractor.name(dependency)).replaceAll("\\.", "_").toLowerCase(Locale.ENGLISH));
+
+		jsonObject.addProperty("id",
+				(metaExtractor.group(dependency) + "_" + metaExtractor.name(dependency) + info.getClassifierSuffix())
+						.replaceAll("\\.", "_")
+						.toLowerCase(Locale.ENGLISH)
+		);
 		jsonObject.addProperty("version", metaExtractor.version(dependency));
 		jsonObject.addProperty("name", metaExtractor.name(dependency));
 
@@ -206,8 +210,8 @@ public final class NestedDependencyProvider implements NestedJarProvider {
 		return LoomGradlePlugin.GSON.toJson(jsonObject);
 	}
 
-	private record DependencyInfo<D>(D dependency, DependencyMetaExtractor<D> metaExtractor, File file) {
-		public void validateInputs() {
+	private record DependencyInfo<D>(D dependency, DependencyMetaExtractor<D> metaExtractor, File file, @Nullable String classifier) {
+		void validateInputs() {
 			if (!file.exists()) {
 				throw new RuntimeException("Failed to include nested jars, as it could not be found @ " + file.getAbsolutePath());
 			}
@@ -216,6 +220,14 @@ public final class NestedDependencyProvider implements NestedJarProvider {
 				throw new RuntimeException("Failed to include nested jars, as file was not a jar: " + file.getAbsolutePath());
 			}
 		}
+
+		String getClassifierSuffix() {
+			if (classifier == null) {
+				return "";
+			} else {
+				return "_" + classifier;
+			}
+		}
 	}
 
 	private interface DependencyMetaExtractor<D> {
diff --git a/src/main/java/net/fabricmc/loom/configuration/CompileConfiguration.java b/src/main/java/net/fabricmc/loom/configuration/CompileConfiguration.java
index 2b6ee858..33ad2a2a 100644
--- a/src/main/java/net/fabricmc/loom/configuration/CompileConfiguration.java
+++ b/src/main/java/net/fabricmc/loom/configuration/CompileConfiguration.java
@@ -142,8 +142,6 @@ public final class CompileConfiguration {
 		p.afterEvaluate(project -> {
 			LoomGradleExtension extension = project.getExtensions().getByType(LoomGradleExtension.class);
 
-			MavenConfiguration.setup(project);
-
 			LoomDependencyManager dependencyManager = new LoomDependencyManager();
 			extension.setDependencyManager(dependencyManager);
 
diff --git a/src/main/java/net/fabricmc/loom/configuration/LoomDependencyManager.java b/src/main/java/net/fabricmc/loom/configuration/LoomDependencyManager.java
index d325457b..e9bb6bae 100644
--- a/src/main/java/net/fabricmc/loom/configuration/LoomDependencyManager.java
+++ b/src/main/java/net/fabricmc/loom/configuration/LoomDependencyManager.java
@@ -45,6 +45,7 @@ import net.fabricmc.loom.configuration.mods.ModProcessor;
 import net.fabricmc.loom.configuration.providers.mappings.MappingsProvider;
 import net.fabricmc.loom.util.Constants;
 import net.fabricmc.loom.util.SourceRemapper;
+import net.fabricmc.loom.LoomRepositoryPlugin;
 
 public class LoomDependencyManager {
 	private static class ProviderList {
@@ -194,7 +195,9 @@ public class LoomDependencyManager {
 
 			project.getLogger().debug("Loom adding " + name + " from installer JSON");
 
-			if (jsonElement.getAsJsonObject().has("url")) {
+			// If user choose to use dependencyResolutionManagement, then they should declare
+			// these repositories manually in the settings file.
+			if (jsonElement.getAsJsonObject().has("url") && !project.getGradle().getPlugins().hasPlugin(LoomRepositoryPlugin.class)) {
 				String url = jsonElement.getAsJsonObject().get("url").getAsString();
 				long count = project.getRepositories().stream().filter(artifactRepository -> artifactRepository instanceof MavenArtifactRepository)
 						.map(artifactRepository -> (MavenArtifactRepository) artifactRepository)
diff --git a/src/main/java/net/fabricmc/loom/configuration/MavenConfiguration.java b/src/main/java/net/fabricmc/loom/configuration/MavenConfiguration.java
deleted file mode 100644
index dc10e375..00000000
--- a/src/main/java/net/fabricmc/loom/configuration/MavenConfiguration.java
+++ /dev/null
@@ -1,74 +0,0 @@
-/*
- * This file is part of fabric-loom, licensed under the MIT License (MIT).
- *
- * Copyright (c) 2016, 2017, 2018 FabricMC
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package net.fabricmc.loom.configuration;
-
-import org.gradle.api.Project;
-import org.gradle.api.artifacts.repositories.MavenArtifactRepository;
-
-import net.fabricmc.loom.LoomGradleExtension;
-
-public class MavenConfiguration {
-	public static void setup(Project project) {
-		LoomGradleExtension extension = project.getExtensions().getByType(LoomGradleExtension.class);
-
-		project.getRepositories().flatDir(repo -> {
-			repo.setName("UserLocalCacheFiles");
-			repo.dir(extension.getRootProjectBuildCache());
-		});
-
-		project.getRepositories().maven(repo -> {
-			repo.setName("UserLocalRemappedMods");
-			repo.setUrl(extension.getRemappedModCache());
-		});
-
-		project.getRepositories().maven(repo -> {
-			repo.setName("Fabric");
-			repo.setUrl("https://maven.fabricmc.net/");
-		});
-
-		project.getRepositories().maven(repo -> {
-			repo.setName("Mojang");
-			repo.setUrl("https://libraries.minecraft.net/");
-		});
-
-		project.getRepositories().maven(repo -> {
-			repo.setName("Forge");
-			repo.setUrl("https://maven.minecraftforge.net/");
-
-			repo.metadataSources(sources -> {
-				sources.mavenPom();
-
-				try {
-					MavenArtifactRepository.MetadataSources.class.getDeclaredMethod("ignoreGradleMetadataRedirection")
-							.invoke(sources);
-				} catch (Throwable ignored) {
-					// Method not available
-				}
-			});
-		});
-
-		project.getRepositories().mavenCentral();
-	}
-}
diff --git a/src/main/java/net/fabricmc/loom/configuration/processors/MinecraftProcessedProvider.java b/src/main/java/net/fabricmc/loom/configuration/processors/MinecraftProcessedProvider.java
index 9673a9a4..f547a3b5 100644
--- a/src/main/java/net/fabricmc/loom/configuration/processors/MinecraftProcessedProvider.java
+++ b/src/main/java/net/fabricmc/loom/configuration/processors/MinecraftProcessedProvider.java
@@ -37,7 +37,7 @@ import net.fabricmc.loom.configuration.providers.minecraft.MinecraftMappedProvid
 import net.fabricmc.loom.util.Constants;
 
 public class MinecraftProcessedProvider extends MinecraftMappedProvider {
-	public static final String PROJECT_MAPPED_CLASSIFIER = "projectmapped";
+	public final String projectMappedClassifier;
 
 	private File projectMappedJar;
 
@@ -46,6 +46,8 @@ public class MinecraftProcessedProvider extends MinecraftMappedProvider {
 	public MinecraftProcessedProvider(Project project, JarProcessorManager jarProcessorManager) {
 		super(project);
 		this.jarProcessorManager = jarProcessorManager;
+		this.projectMappedClassifier = "project-" + project.getPath().replace(':', '@')
+				+ "-mapped";
 	}
 
 	@Override
@@ -65,14 +67,12 @@ public class MinecraftProcessedProvider extends MinecraftMappedProvider {
 			jarProcessorManager.process(projectMappedJar);
 		}
 
-		getProject().getRepositories().flatDir(repository -> repository.dir(getJarDirectory(getExtension().getProjectPersistentCache(), PROJECT_MAPPED_CLASSIFIER)));
-
 		getProject().getDependencies().add(Constants.Configurations.MINECRAFT_NAMED,
-				getProject().getDependencies().module("net.minecraft:minecraft:" + getJarVersionString(PROJECT_MAPPED_CLASSIFIER)));
+				getProject().getDependencies().module("net.minecraft:minecraft:" + getJarVersionString(projectMappedClassifier)));
 	}
 
 	private void invalidateJars() {
-		File dir = getJarDirectory(getExtension().getUserCache(), PROJECT_MAPPED_CLASSIFIER);
+		File dir = getJarDirectory(getExtension().getUserCache(), projectMappedClassifier);
 
 		if (dir.exists()) {
 			getProject().getLogger().warn("Invalidating project jars");
@@ -89,7 +89,7 @@ public class MinecraftProcessedProvider extends MinecraftMappedProvider {
 	public void initFiles(MinecraftProvider minecraftProvider, MappingsProvider mappingsProvider) {
 		super.initFiles(minecraftProvider, mappingsProvider);
 
-		projectMappedJar = new File(getJarDirectory(getExtension().getProjectPersistentCache(), PROJECT_MAPPED_CLASSIFIER), "minecraft-" + getJarVersionString(PROJECT_MAPPED_CLASSIFIER) + ".jar");
+		projectMappedJar = new File(getJarDirectory(getExtension().getRootProjectPersistentCache(), projectMappedClassifier), "minecraft-" + getJarVersionString(projectMappedClassifier) + ".jar");
 	}
 
 	@Override
diff --git a/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/MinecraftMappedProvider.java b/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/MinecraftMappedProvider.java
index 14333000..fbc9ea86 100644
--- a/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/MinecraftMappedProvider.java
+++ b/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/MinecraftMappedProvider.java
@@ -290,8 +290,6 @@ public class MinecraftMappedProvider extends DependencyProvider {
 	}
 
 	protected void addDependencies(DependencyInfo dependency, Consumer<Runnable> postPopulationScheduler) {
-		getProject().getRepositories().flatDir(repository -> repository.dir(getJarDirectory(getExtension().getUserCache(), "mapped")));
-
 		getProject().getDependencies().add(Constants.Configurations.MINECRAFT_NAMED,
 				getProject().getDependencies().module("net.minecraft:minecraft:" + getJarVersionString("mapped")));
 	}
diff --git a/src/main/java/net/fabricmc/loom/decompilers/fernflower/AbstractFernFlowerDecompiler.java b/src/main/java/net/fabricmc/loom/decompilers/fernflower/AbstractFernFlowerDecompiler.java
index 13df1b66..a93341ad 100644
--- a/src/main/java/net/fabricmc/loom/decompilers/fernflower/AbstractFernFlowerDecompiler.java
+++ b/src/main/java/net/fabricmc/loom/decompilers/fernflower/AbstractFernFlowerDecompiler.java
@@ -106,7 +106,14 @@ public abstract class AbstractFernFlowerDecompiler implements LoomDecompiler {
 					spec.getMainClass().set(fernFlowerExecutor().getName());
 					spec.jvmArgs("-Xms200m", "-Xmx3G");
 					spec.setArgs(args);
-					spec.setErrorOutput(System.err);
+					spec.setErrorOutput(new ConsumingOutputStream(line -> {
+						if (line.startsWith("Inconsistent inner class entries")) {
+							// Suppress this
+							return;
+						}
+
+						System.err.println(line);
+					}));
 					spec.setStandardOutput(new ConsumingOutputStream(line -> {
 						if (line.startsWith("Listening for transport") || !line.contains("::")) {
 							System.out.println(line);