General cleanup by making use of java 16 features (#397)

* General cleanup by making use of java 16 features

* use jackson-databind in place of gson when reading to a record

* Fixes

* cleanup

* dep updates

* Replace commons IOUtils usage with native java

* Update fernflower

README.md

@@ -6,8 +6,8 @@ A [Gradle](https://gradle.org/) plugin to setup a deobfuscated development envir
 * Utilises the Fernflower and CFR decompilers to generate source code with comments.
 * Designed to support modern versions of Minecraft (Tested with 1.14.4 and upwards)
 * Built in support for IntelliJ IDEA, Eclipse and Visual Studio Code to generate run configurations for Minecraft.
-* Loom targets a wide range of Gradle versions. _Tested with 4.9 up to 6.7_
+* Loom targets the latest version of Gradle 7 or newer 
-* Supports the latest version of Java all the way down to Java 8
+* Supports Java 16 upwards
 
 ## Use Loom to develop mods
 

build.gradle

@@ -46,6 +46,7 @@ dependencies {
 	implementation ('commons-io:commons-io:2.8.0')
 	implementation ('org.zeroturnaround:zt-zip:1.14')
 	implementation ('com.google.code.gson:gson:2.8.6')
+	implementation ('com.fasterxml.jackson.core:jackson-databind:2.12.3')
 	implementation ('com.google.guava:guava:30.1-jre')
 	implementation ('org.ow2.asm:asm:9.1')
 	implementation ('org.ow2.asm:asm-analysis:9.1')
@@ -70,21 +71,21 @@ dependencies {
 	implementation ('org.cadixdev:lorenz-io-proguard:0.5.6')
 
 	// decompilers
-	implementation ('net.fabricmc:fabric-fernflower:1.3.0')
+	implementation ('net.fabricmc:fabric-fernflower:1.4.0')
-	implementation ('org.benf:cfr:0.150')
+	implementation ('org.benf:cfr:0.151')
 
 	// source code remapping
 	implementation ('org.cadixdev:mercury:0.1.0-rc1')
 
 	// Kapt integration
-	compileOnly('org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.32')
+	compileOnly('org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.0')
 
 	// Testing
 	testImplementation(gradleTestKit())
 	testImplementation('org.spockframework:spock-core:2.0-M5-groovy-3.0') {
 		exclude module: 'groovy-all'
 	}
-	testImplementation 'io.javalin:javalin:3.13.4'
+	testImplementation 'io.javalin:javalin:3.13.7'
 
 	compileOnly 'org.jetbrains:annotations:20.1.0'
 }
@@ -115,11 +116,11 @@ license {
 
 checkstyle {
 	configFile = file('checkstyle.xml')
-	toolVersion = '8.41.1'
+	toolVersion = '8.42'
 }
 
 codenarc {
-	toolVersion = "2.0.0"
+	toolVersion = "2.1.0"
 	configFile = file("codenarc.groovy")
 }
 

src/main/java/net/fabricmc/loom/LoomGradlePlugin.java

@@ -24,6 +24,8 @@
 
 package net.fabricmc.loom;
 
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.collect.ImmutableMap;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
@@ -41,6 +43,7 @@ import net.fabricmc.loom.task.LoomTasks;
 public class LoomGradlePlugin implements Plugin<Project> {
 	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(Project project) {

src/main/java/net/fabricmc/loom/api/decompilers/DecompilationMetadata.java

@@ -27,14 +27,5 @@ package net.fabricmc.loom.api.decompilers;
 import java.nio.file.Path;
 import java.util.Collection;
 
-public class DecompilationMetadata {
+public record DecompilationMetadata(int numberOfThreads, Path javaDocs, Collection<Path> libraries) {
-	public final int numberOfThreads;
-	public final Path javaDocs;
-	public final Collection<Path> libraries;
-
-	public DecompilationMetadata(int numberOfThreads, Path javaDocs, Collection<Path> libraries) {
-		this.numberOfThreads = numberOfThreads;
-		this.javaDocs = javaDocs;
-		this.libraries = libraries;
-	}
 }

src/main/java/net/fabricmc/loom/build/ModCompileRemapper.java

@@ -69,7 +69,7 @@ public class ModCompileRemapper {
 
 		for (RemappedConfigurationEntry entry : Constants.MOD_COMPILE_ENTRIES) {
 			data.getLazyConfigurationProvider(entry.getRemappedConfiguration()).configure(remappedConfig -> {
-				Configuration sourceConfig = project.getConfigurations().getByName(entry.getSourceConfiguration());
+				Configuration sourceConfig = project.getConfigurations().getByName(entry.sourceConfiguration());
 				Configuration regularConfig = project.getConfigurations().getByName(entry.getTargetConfiguration(project.getConfigurations()));
 
 				List<ModDependencyInfo> modDependencies = new ArrayList<>();
@@ -149,8 +149,8 @@ public class ModCompileRemapper {
 		Dependency dep = dependencies.module(artifact.getModuleVersion().toString()
 						+ (artifact.getClassifier() == null ? "" : ':' + artifact.getClassifier())); // the owning module of the artifact
 
-		if (dep instanceof ModuleDependency) {
+		if (dep instanceof ModuleDependency moduleDependency) {
-			((ModuleDependency) dep).setTransitive(false);
+			moduleDependency.setTransitive(false);
 		}
 
 		dependencies.add(regularCompile.getName(), dep);

src/main/java/net/fabricmc/loom/build/mixin/AnnotationProcessorInvoker.java

@@ -71,7 +71,7 @@ public abstract class AnnotationProcessorInvoker<T extends Task> {
 	private void passMixinArguments(T task) {
 		try {
 			LoomGradleExtension extension = project.getExtensions().getByType(LoomGradleExtension.class);
-			Map<String, String> args = new HashMap<String, String>() {{
+			Map<String, String> args = new HashMap<>() {{
 					put(Constants.MixinArguments.IN_MAP_FILE_NAMED_INTERMEDIARY, extension.getMappingsProvider().tinyMappings.getCanonicalPath());
 					put(Constants.MixinArguments.OUT_MAP_FILE_NAMED_INTERMEDIARY, extension.getNextMixinMappings().getCanonicalPath());
 					put(Constants.MixinArguments.OUT_REFMAP_FILE, getRefmapDestination(task, extension));

src/main/java/net/fabricmc/loom/build/nesting/MergedNestedJarProvider.java

@@ -29,13 +29,7 @@ import java.util.Arrays;
 import java.util.Collection;
 import java.util.stream.Collectors;
 
-public class MergedNestedJarProvider implements NestedJarProvider {
+public record MergedNestedJarProvider(NestedJarProvider... parents) implements NestedJarProvider {
-	private final NestedJarProvider[] parents;
-
-	public MergedNestedJarProvider(NestedJarProvider... parents) {
-		this.parents = parents;
-	}
-
 	@Override
 	public Collection<File> provide() {
 		return Arrays.stream(parents)

src/main/java/net/fabricmc/loom/build/nesting/NestedDependencyProvider.java

@@ -80,13 +80,12 @@ public final class NestedDependencyProvider implements NestedJarProvider {
 		DependencySet dependencies = configuration.getDependencies();
 
 		for (Dependency dependency : dependencies) {
-			if (dependency instanceof ProjectDependency) {
+			if (dependency instanceof ProjectDependency projectDependency) {
-				ProjectDependency projectDependency = (ProjectDependency) dependency;
 				Project dependencyProject = projectDependency.getDependencyProject();
 
 				for (Task task : dependencyProject.getTasksByName("remapJar", false)) {
-					if (task instanceof RemapJarTask) {
+					if (task instanceof RemapJarTask remapJarTask) {
-						remapTasks.add((RemapJarTask) task);
+						remapTasks.add(remapJarTask);
 					}
 				}
 			}
@@ -99,8 +98,7 @@ public final class NestedDependencyProvider implements NestedJarProvider {
 		List<DependencyInfo<ProjectDependency>> fileList = new ArrayList<>();
 
 		for (Dependency dependency : configuration.getDependencies()) {
-			if (dependency instanceof ProjectDependency) {
+			if (dependency instanceof ProjectDependency projectDependency) {
-				ProjectDependency projectDependency = (ProjectDependency) dependency;
 				Project dependencyProject = projectDependency.getDependencyProject();
 
 				visited.add(dependency.getGroup() + ":" + dependency.getName() + ":" + dependency.getVersion());
@@ -110,11 +108,11 @@ public final class NestedDependencyProvider implements NestedJarProvider {
 				Collection<Task> jarTasks = dependencyProject.getTasksByName("jar", false);
 
 				for (Task task : remapJarTasks.isEmpty() ? jarTasks : remapJarTasks) {
-					if (task instanceof RemapJarTask) {
+					if (task instanceof RemapJarTask remapJarTask) {
-						File file = ((RemapJarTask) task).getArchivePath();
+						File file = remapJarTask.getArchiveFile().get().getAsFile();
 						fileList.add(new DependencyInfo<>(projectDependency, new ProjectDependencyMetaExtractor(), file));
-					} else if (task instanceof AbstractArchiveTask) {
+					} else if (task instanceof AbstractArchiveTask abstractArchiveTask) {
-						File file = ((AbstractArchiveTask) task).getArchivePath();
+						File file = abstractArchiveTask.getArchiveFile().get().getAsFile();
 						fileList.add(new DependencyInfo<>(projectDependency, new ProjectDependencyMetaExtractor(), file));
 					}
 				}
@@ -208,17 +206,7 @@ public final class NestedDependencyProvider implements NestedJarProvider {
 		return LoomGradlePlugin.GSON.toJson(jsonObject);
 	}
 
-	private static class DependencyInfo<D> {
+	private record DependencyInfo<D>(D dependency, DependencyMetaExtractor<D> metaExtractor, File file) {
-		final D dependency;
-		final DependencyMetaExtractor<D> metaExtractor;
-		final File file;
-
-		DependencyInfo(D dependency, DependencyMetaExtractor<D> metaExtractor, File file) {
-			this.dependency = dependency;
-			this.metaExtractor = metaExtractor;
-			this.file = file;
-		}
-
 		public void validateInputs() {
 			if (!file.exists()) {
 				throw new RuntimeException("Failed to include nested jars, as it could not be found @ " + file.getAbsolutePath());

src/main/java/net/fabricmc/loom/configuration/CompileConfiguration.java

@@ -67,7 +67,7 @@ public final class CompileConfiguration {
 		data.createLazyConfiguration(Constants.Configurations.UNPICK_CLASSPATH);
 
 		for (RemappedConfigurationEntry entry : Constants.MOD_COMPILE_ENTRIES) {
-			data.createLazyConfiguration(entry.getSourceConfiguration())
+			data.createLazyConfiguration(entry.sourceConfiguration())
 					.configure(configuration -> configuration.setTransitive(true));
 
 			// Don't get transitive deps of already remapped mods
@@ -77,7 +77,7 @@ public final class CompileConfiguration {
 			extendsFrom(entry.getTargetConfiguration(configurations), entry.getRemappedConfiguration(), project);
 
 			if (entry.isOnModCompileClasspath()) {
-				extendsFrom(Constants.Configurations.MOD_COMPILE_CLASSPATH, entry.getSourceConfiguration(), project);
+				extendsFrom(Constants.Configurations.MOD_COMPILE_CLASSPATH, entry.sourceConfiguration(), project);
 				extendsFrom(Constants.Configurations.MOD_COMPILE_CLASSPATH_MAPPED, entry.getRemappedConfiguration(), project);
 			}
 		}

src/main/java/net/fabricmc/loom/configuration/DependencyProvider.java

@@ -100,8 +100,8 @@ public abstract class DependencyProvider {
 		private String resolvedVersion = null;
 
 		public static DependencyInfo create(Project project, Dependency dependency, Configuration sourceConfiguration) {
-			if (dependency instanceof SelfResolvingDependency) {
+			if (dependency instanceof SelfResolvingDependency selfResolvingDependency) {
-				return new FileDependencyInfo(project, (SelfResolvingDependency) dependency, sourceConfiguration);
+				return new FileDependencyInfo(project, selfResolvingDependency, sourceConfiguration);
 			} else {
 				return new DependencyInfo(project, dependency, sourceConfiguration);
 			}
@@ -138,8 +138,8 @@ public abstract class DependencyProvider {
 		}
 
 		public Set<File> resolve() {
-			if (dependency instanceof SelfResolvingDependency) {
+			if (dependency instanceof SelfResolvingDependency selfResolvingDependency) {
-				return ((SelfResolvingDependency) dependency).resolve();
+				return selfResolvingDependency.resolve();
 			}
 
 			return sourceConfiguration.files(dependency);
@@ -189,14 +189,11 @@ public abstract class DependencyProvider {
 			Set<File> files = dependency.resolve();
 			this.resolvedFiles = files;
 			switch (files.size()) {
-			case 0: //Don't think Gradle would ever let you do this
+			case 0 -> //Don't think Gradle would ever let you do this
-				throw new IllegalStateException("Empty dependency?");
+					throw new IllegalStateException("Empty dependency?");
-
+			case 1 -> //Single file dependency
-			case 1: //Single file dependency
+					classifierToFile.put("", Iterables.getOnlyElement(files));
-				classifierToFile.put("", Iterables.getOnlyElement(files));
+			default -> { //File collection, try work out the classifiers
-				break;
-
-			default: //File collection, try work out the classifiers
 				List<File> sortedFiles = files.stream().sorted(Comparator.comparing(File::getName, Comparator.comparingInt(String::length))).collect(Collectors.toList());
 				//First element in sortedFiles is the one with the shortest name, we presume all the others are different classifier types of this
 				File shortest = sortedFiles.remove(0);
@@ -223,6 +220,7 @@ public abstract class DependencyProvider {
 					}
 				}
 			}
+			}
 
 			if (dependency.getGroup() != null && dependency.getVersion() != null) {
 				group = dependency.getGroup();

src/main/java/net/fabricmc/loom/configuration/MavenPublication.java

@@ -51,7 +51,7 @@ public final class MavenPublication {
 					continue;
 				}
 
-				Configuration compileModsConfig = p.getConfigurations().getByName(entry.getSourceConfiguration());
+				Configuration compileModsConfig = p.getConfigurations().getByName(entry.sourceConfiguration());
 
 				// add modsCompile to maven-publish
 				PublishingExtension mavenPublish = p.getExtensions().findByType(PublishingExtension.class);
@@ -92,7 +92,7 @@ public final class MavenPublication {
 						depNode.appendNode("groupId", dependency.getGroup());
 						depNode.appendNode("artifactId", dependency.getName());
 						depNode.appendNode("version", dependency.getVersion());
-						depNode.appendNode("scope", entry.getMavenScope());
+						depNode.appendNode("scope", entry.mavenScope());
 
 						if (!(dependency instanceof ModuleDependency)) {
 							continue;

src/main/java/net/fabricmc/loom/configuration/RemappedConfigurationEntry.java

@@ -27,35 +27,11 @@ package net.fabricmc.loom.configuration;
 import org.gradle.api.artifacts.ConfigurationContainer;
 import org.gradle.api.plugins.JavaPlugin;
 
-public class RemappedConfigurationEntry {
+public record RemappedConfigurationEntry(String sourceConfiguration, String targetConfiguration, boolean isOnModCompileClasspath, String mavenScope) {
-	private final String sourceConfiguration;
-	private final String targetConfiguration;
-	private final String mavenScope;
-	private final boolean isOnModCompileClasspath;
-
-	public RemappedConfigurationEntry(String sourceConfiguration, String targetConfiguration, boolean isOnModCompileClasspath, String mavenScope) {
-		this.sourceConfiguration = sourceConfiguration;
-		this.targetConfiguration = targetConfiguration;
-		this.isOnModCompileClasspath = isOnModCompileClasspath;
-		this.mavenScope = mavenScope;
-	}
-
-	public String getMavenScope() {
-		return mavenScope;
-	}
-
 	public boolean hasMavenScope() {
 		return mavenScope != null && !mavenScope.isEmpty();
 	}
 
-	public boolean isOnModCompileClasspath() {
-		return isOnModCompileClasspath;
-	}
-
-	public String getSourceConfiguration() {
-		return sourceConfiguration;
-	}
-
 	public String getRemappedConfiguration() {
 		return sourceConfiguration + "Mapped";
 	}

src/main/java/net/fabricmc/loom/configuration/ide/RunConfig.java

@@ -36,7 +36,6 @@ import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
-import org.apache.commons.io.IOUtils;
 import org.gradle.api.Project;
 import org.gradle.api.tasks.SourceSet;
 import org.gradle.plugins.ide.eclipse.model.EclipseModel;
@@ -222,7 +221,7 @@ public class RunConfig {
 		String dummyConfig;
 
 		try (InputStream input = SetupIntelijRunConfigs.class.getClassLoader().getResourceAsStream(dummy)) {
-			dummyConfig = IOUtils.toString(input, StandardCharsets.UTF_8);
+			dummyConfig = new String(input.readAllBytes(), StandardCharsets.UTF_8);
 		}
 
 		dummyConfig = dummyConfig.replace("%NAME%", configName);

src/main/java/net/fabricmc/loom/configuration/mods/ModProcessor.java

@@ -42,7 +42,6 @@ import java.util.stream.Collectors;
 import java.util.zip.ZipEntry;
 
 import com.google.gson.JsonObject;
-import org.apache.commons.io.IOUtils;
 import org.gradle.api.Project;
 import org.objectweb.asm.commons.Remapper;
 import org.zeroturnaround.zip.ZipUtil;
@@ -156,7 +155,7 @@ public class ModProcessor {
 		final Map<ModDependencyInfo, byte[]> accessWidenerMap = new HashMap<>();
 
 		for (RemappedConfigurationEntry entry : Constants.MOD_COMPILE_ENTRIES) {
-			for (File inputFile : project.getConfigurations().getByName(entry.getSourceConfiguration()).getFiles()) {
+			for (File inputFile : project.getConfigurations().getByName(entry.sourceConfiguration()).getFiles()) {
 				if (remapList.stream().noneMatch(info -> info.getInputFile().equals(inputFile))) {
 					project.getLogger().debug("Adding " + inputFile + " onto the remap classpath");
 
@@ -229,7 +228,7 @@ public class ModProcessor {
 				}
 
 				try (InputStream inputstream = jarFile.getInputStream(entry)) {
-					jsonStr = IOUtils.toString(inputstream, StandardCharsets.UTF_8);
+					jsonStr = new String(inputstream.readAllBytes(), StandardCharsets.UTF_8);
 				}
 			}
 

src/main/java/net/fabricmc/loom/configuration/processors/dependency/ModDependencyInfo.java

@@ -34,7 +34,6 @@ import java.util.jar.JarFile;
 
 import com.google.gson.JsonObject;
 import org.apache.commons.io.FileUtils;
-import org.apache.commons.io.IOUtils;
 import org.gradle.api.artifacts.Configuration;
 import org.jetbrains.annotations.Nullable;
 
@@ -80,7 +79,7 @@ public class ModDependencyInfo {
 	}
 
 	public File getRemappedDir() {
-		return new File(remapData.modStore, String.format("%s/%s/%s", getGroup().replace(".", "/"), name, version));
+		return new File(remapData.modStore(), String.format("%s/%s/%s", getGroup().replace(".", "/"), name, version));
 	}
 
 	public File getRemappedOutput() {
@@ -96,7 +95,7 @@ public class ModDependencyInfo {
 	}
 
 	private String getGroup() {
-		return getMappingsPrefix(remapData.mappingsSuffix) + "." + group;
+		return getMappingsPrefix(remapData.mappingsSuffix()) + "." + group;
 	}
 
 	public static String getMappingsPrefix(String mappings) {
@@ -121,7 +120,7 @@ public class ModDependencyInfo {
 			String pomTemplate;
 
 			try (InputStream input = ModDependencyInfo.class.getClassLoader().getResourceAsStream("mod_compile_template.pom")) {
-				pomTemplate = IOUtils.toString(input, StandardCharsets.UTF_8);
+				pomTemplate = new String(input.readAllBytes(), StandardCharsets.UTF_8);
 			}
 
 			pomTemplate = pomTemplate

src/main/java/net/fabricmc/loom/configuration/processors/dependency/RemapData.java

@@ -26,12 +26,5 @@ package net.fabricmc.loom.configuration.processors.dependency;
 
 import java.io.File;
 
-public class RemapData {
+public record RemapData(String mappingsSuffix, File modStore) {
-	public final String mappingsSuffix;
-	public final File modStore;
-
-	public RemapData(String mappingsSuffix, File modStore) {
-		this.mappingsSuffix = mappingsSuffix;
-		this.modStore = modStore;
-	}
 }

src/main/java/net/fabricmc/loom/configuration/providers/LaunchProvider.java

@@ -65,7 +65,7 @@ public class LaunchProvider extends DependencyProvider {
 				.property("client", "org.lwjgl.librarypath", getExtension().getNativesDirectory().getAbsolutePath())
 
 				.argument("client", "--assetIndex")
-				.argument("client", getExtension().getMinecraftProvider().getVersionInfo().getAssetIndex().getFabricId(getExtension().getMinecraftProvider().getMinecraftVersion()))
+				.argument("client", getExtension().getMinecraftProvider().getVersionInfo().assetIndex().fabricId(getExtension().getMinecraftProvider().getMinecraftVersion()))
 				.argument("client", "--assetsDir")
 				.argument("client", new File(getExtension().getUserCache(), "assets").getAbsolutePath());
 
@@ -112,7 +112,7 @@ public class LaunchProvider extends DependencyProvider {
 	private void writeRemapClassPath() {
 		List<String> inputConfigurations = new ArrayList<>();
 		inputConfigurations.add(Constants.Configurations.LOADER_DEPENDENCIES);
-		inputConfigurations.addAll(Constants.MOD_COMPILE_ENTRIES.stream().map(RemappedConfigurationEntry::getSourceConfiguration).collect(Collectors.toList()));
+		inputConfigurations.addAll(Constants.MOD_COMPILE_ENTRIES.stream().map(RemappedConfigurationEntry::sourceConfiguration).collect(Collectors.toList()));
 
 		List<File> remapClasspath = new ArrayList<>();
 
@@ -127,7 +127,7 @@ public class LaunchProvider extends DependencyProvider {
 				.collect(Collectors.joining(File.pathSeparator));
 
 		try {
-			Files.write(getRemapClasspathFile().toPath(), str.getBytes(StandardCharsets.UTF_8));
+			Files.writeString(getRemapClasspathFile().toPath(), str);
 		} catch (IOException e) {
 			throw new RuntimeException("Failed to generate remap classpath", e);
 		}

src/main/java/net/fabricmc/loom/configuration/providers/MinecraftProvider.java

@@ -33,7 +33,6 @@ import java.util.Optional;
 import java.util.function.Consumer;
 
 import com.google.common.io.Files;
-import com.google.gson.GsonBuilder;
 import org.gradle.api.GradleException;
 import org.gradle.api.Project;
 import org.gradle.api.logging.Logger;
@@ -75,7 +74,7 @@ public class MinecraftProvider extends DependencyProvider {
 		downloadMcJson(offline);
 
 		try (FileReader reader = new FileReader(minecraftJson)) {
-			versionInfo = LoomGradlePlugin.GSON.fromJson(reader, MinecraftVersionMeta.class);
+			versionInfo = LoomGradlePlugin.OBJECT_MAPPER.readValue(reader, MinecraftVersionMeta.class);
 		}
 
 		// Add Loom as an annotation processor
@@ -140,7 +139,7 @@ public class MinecraftProvider extends DependencyProvider {
 		}
 
 		String versionManifest = Files.asCharSource(versionManifestJson, StandardCharsets.UTF_8).read();
-		ManifestVersion mcManifest = new GsonBuilder().create().fromJson(versionManifest, ManifestVersion.class);
+		ManifestVersion mcManifest = LoomGradlePlugin.OBJECT_MAPPER.readValue(versionManifest, ManifestVersion.class);
 
 		Optional<ManifestVersion.Versions> optionalVersion = Optional.empty();
 
@@ -153,7 +152,7 @@ public class MinecraftProvider extends DependencyProvider {
 		}
 
 		if (!optionalVersion.isPresent()) {
-			optionalVersion = mcManifest.versions.stream().filter(versions -> versions.id.equalsIgnoreCase(minecraftVersion)).findFirst();
+			optionalVersion = mcManifest.versions().stream().filter(versions -> versions.id.equalsIgnoreCase(minecraftVersion)).findFirst();
 		}
 
 		if (optionalVersion.isPresent()) {
@@ -197,8 +196,8 @@ public class MinecraftProvider extends DependencyProvider {
 			return false;
 		}
 
-		ManifestVersion manifest = new GsonBuilder().create().fromJson(Files.asCharSource(versionManifestJson, StandardCharsets.UTF_8).read(), ManifestVersion.class);
+		ManifestVersion manifest = LoomGradlePlugin.OBJECT_MAPPER.readValue(Files.asCharSource(versionManifestJson, StandardCharsets.UTF_8).read(), ManifestVersion.class);
-		Optional<ManifestVersion.Versions> version = manifest.versions.stream().filter(versions -> versions.id.equalsIgnoreCase(minecraftVersion)).findFirst();
+		Optional<ManifestVersion.Versions> version = manifest.versions().stream().filter(versions -> versions.id.equalsIgnoreCase(minecraftVersion)).findFirst();
 
 		// fail if the expected mc version was not found, will download the file again.
 		return version.isPresent();
@@ -209,11 +208,11 @@ public class MinecraftProvider extends DependencyProvider {
 			return;
 		}
 
-		MinecraftVersionMeta.Download client = versionInfo.getDownload("client");
+		MinecraftVersionMeta.Download client = versionInfo.download("client");
-		MinecraftVersionMeta.Download server = versionInfo.getDownload("server");
+		MinecraftVersionMeta.Download server = versionInfo.download("server");
 
-		HashedDownloadUtil.downloadIfInvalid(new URL(client.getUrl()), minecraftClientJar, client.getSha1(), logger, false);
+		HashedDownloadUtil.downloadIfInvalid(new URL(client.url()), minecraftClientJar, client.sha1(), logger, false);
-		HashedDownloadUtil.downloadIfInvalid(new URL(server.getUrl()), minecraftServerJar, server.getSha1(), logger, false);
+		HashedDownloadUtil.downloadIfInvalid(new URL(server.url()), minecraftServerJar, server.sha1(), logger, false);
 	}
 
 	private void mergeJars(Logger logger) throws IOException {

src/main/java/net/fabricmc/loom/configuration/providers/mappings/MappingsProvider.java

@@ -28,7 +28,6 @@ import java.io.BufferedReader;
 import java.io.File;
 import java.io.IOException;
 import java.net.URL;
-import java.nio.charset.StandardCharsets;
 import java.nio.file.FileSystem;
 import java.nio.file.FileSystems;
 import java.nio.file.Files;
@@ -259,7 +258,7 @@ public class MappingsProvider extends DependencyProvider {
 	}
 
 	private UnpickMetadata parseUnpickMetadata(Path input) throws IOException {
-		JsonObject jsonObject = LoomGradlePlugin.GSON.fromJson(new String(Files.readAllBytes(input), StandardCharsets.UTF_8), JsonObject.class);
+		JsonObject jsonObject = LoomGradlePlugin.GSON.fromJson(Files.readString(input), JsonObject.class);
 
 		if (!jsonObject.has("version") || jsonObject.get("version").getAsInt() != 1) {
 			throw new UnsupportedOperationException("Unsupported unpick version");
@@ -409,13 +408,6 @@ public class MappingsProvider extends DependencyProvider {
 		return hasUnpickDefinitions;
 	}
 
-	public static class UnpickMetadata {
+	public record UnpickMetadata(String unpickGroup, String unpickVersion) {
-		public final String unpickGroup;
-		public final String unpickVersion;
-
-		public UnpickMetadata(String unpickGroup, String unpickVersion) {
-			this.unpickGroup = unpickGroup;
-			this.unpickVersion = unpickVersion;
-		}
 	}
 }

src/main/java/net/fabricmc/loom/configuration/providers/mappings/MojangMappingsDependency.java

@@ -123,15 +123,15 @@ public class MojangMappingsDependency implements SelfResolvingDependency {
 	private MappingSet getMappingsSet(Path clientMappings, Path serverMappings) throws IOException {
 		MinecraftVersionMeta versionInfo = extension.getMinecraftProvider().getVersionInfo();
 
-		if (versionInfo.getDownload(MANIFEST_CLIENT_MAPPINGS) == null) {
+		if (versionInfo.download(MANIFEST_CLIENT_MAPPINGS) == null) {
 			throw new RuntimeException("Failed to find official mojang mappings for " + getVersion());
 		}
 
-		MinecraftVersionMeta.Download clientMappingsDownload = versionInfo.getDownload(MANIFEST_CLIENT_MAPPINGS);
+		MinecraftVersionMeta.Download clientMappingsDownload = versionInfo.download(MANIFEST_CLIENT_MAPPINGS);
-		MinecraftVersionMeta.Download serverMappingsDownload = versionInfo.getDownload(MANIFEST_CLIENT_MAPPINGS);
+		MinecraftVersionMeta.Download serverMappingsDownload = versionInfo.download(MANIFEST_CLIENT_MAPPINGS);
 
-		HashedDownloadUtil.downloadIfInvalid(new URL(clientMappingsDownload.getUrl()), clientMappings.toFile(), clientMappingsDownload.getSha1(), project.getLogger(), false);
+		HashedDownloadUtil.downloadIfInvalid(new URL(clientMappingsDownload.url()), clientMappings.toFile(), clientMappingsDownload.sha1(), project.getLogger(), false);
-		HashedDownloadUtil.downloadIfInvalid(new URL(serverMappingsDownload.getUrl()), serverMappings.toFile(), clientMappingsDownload.getSha1(), project.getLogger(), false);
+		HashedDownloadUtil.downloadIfInvalid(new URL(serverMappingsDownload.url()), serverMappings.toFile(), clientMappingsDownload.sha1(), project.getLogger(), false);
 
 		MappingSet mappings = MappingSet.create();
 
@@ -208,8 +208,8 @@ public class MojangMappingsDependency implements SelfResolvingDependency {
 
 	@Override
 	public boolean contentEquals(Dependency dependency) {
-		if (dependency instanceof MojangMappingsDependency) {
+		if (dependency instanceof MojangMappingsDependency mojangMappingsDependency) {
-			return ((MojangMappingsDependency) dependency).extension.getMinecraftProvider().getMinecraftVersion().equals(getVersion());
+			return mojangMappingsDependency.extension.getMinecraftProvider().getMinecraftVersion().equals(getVersion());
 		}
 
 		return false;

src/main/java/net/fabricmc/loom/configuration/providers/minecraft/ManifestVersion.java

@@ -24,12 +24,10 @@
 
 package net.fabricmc.loom.configuration.providers.minecraft;
 
-import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
 
-public class ManifestVersion {
+public record ManifestVersion(List<Versions> versions, Map<String, String> latest) {
-	public List<Versions> versions = new ArrayList<>();
-
 	public static class Versions {
 		public String id, url, sha1;
 	}

src/main/java/net/fabricmc/loom/configuration/providers/minecraft/MinecraftLibraryProvider.java

@@ -40,9 +40,9 @@ public class MinecraftLibraryProvider {
 
 		initFiles(project, minecraftProvider);
 
-		for (MinecraftVersionMeta.Library library : versionInfo.getLibraries()) {
+		for (MinecraftVersionMeta.Library library : versionInfo.libraries()) {
-			if (library.isValidForOS() && !library.hasNatives() && library.getArtifact() != null) {
+			if (library.isValidForOS() && !library.hasNatives() && library.artifact() != null) {
-				project.getDependencies().add(Constants.Configurations.MINECRAFT_DEPENDENCIES, project.getDependencies().module(library.getName()));
+				project.getDependencies().add(Constants.Configurations.MINECRAFT_DEPENDENCIES, project.getDependencies().module(library.name()));
 			}
 		}
 	}

src/main/java/net/fabricmc/loom/configuration/providers/minecraft/MinecraftNativesProvider.java

@@ -89,11 +89,11 @@ public class MinecraftNativesProvider {
 
 		nativesDir.mkdirs();
 
-		for (MinecraftVersionMeta.Classifier library : getNatives()) {
+		for (MinecraftVersionMeta.Download library : getNatives()) {
-			File libJarFile = library.getRelativeFile(jarStore);
+			File libJarFile = library.relativeFile(jarStore);
 
 			if (!offline) {
-				HashedDownloadUtil.downloadIfInvalid(new URL(library.getUrl()), libJarFile, library.getSha1(), project.getLogger(), false);
+				HashedDownloadUtil.downloadIfInvalid(new URL(library.url()), libJarFile, library.sha1(), project.getLogger(), false);
 			}
 
 			if (!libJarFile.exists()) {
@@ -104,19 +104,19 @@ public class MinecraftNativesProvider {
 
 			// Store a file containing the hash of the extracted natives, used on subsequent runs to skip extracting all the natives if they haven't changed
 			File libSha1File = new File(nativesDir, libJarFile.getName() + ".sha1");
-			FileUtils.writeStringToFile(libSha1File, library.getSha1(), StandardCharsets.UTF_8);
+			FileUtils.writeStringToFile(libSha1File, library.sha1(), StandardCharsets.UTF_8);
 		}
 	}
 
 	private boolean requiresExtract() {
-		List<MinecraftVersionMeta.Classifier> natives = getNatives();
+		List<MinecraftVersionMeta.Download> natives = getNatives();
 
 		if (natives.isEmpty()) {
 			throw new IllegalStateException("No natives found for the current system");
 		}
 
-		for (MinecraftVersionMeta.Classifier library : natives) {
+		for (MinecraftVersionMeta.Download library : natives) {
-			File libJarFile = library.getRelativeFile(jarStore);
+			File libJarFile = library.relativeFile(jarStore);
 			File libSha1File = new File(nativesDir, libJarFile.getName() + ".sha1");
 
 			if (!libSha1File.exists()) {
@@ -126,7 +126,7 @@ public class MinecraftNativesProvider {
 			try {
 				String sha1 = FileUtils.readFileToString(libSha1File, StandardCharsets.UTF_8);
 
-				if (!sha1.equalsIgnoreCase(library.getSha1())) {
+				if (!sha1.equalsIgnoreCase(library.sha1())) {
 					return true;
 				}
 			} catch (IOException e) {
@@ -139,10 +139,10 @@ public class MinecraftNativesProvider {
 		return false;
 	}
 
-	private List<MinecraftVersionMeta.Classifier> getNatives() {
+	private List<MinecraftVersionMeta.Download> getNatives() {
-		return extension.getMinecraftProvider().getVersionInfo().getLibraries().stream()
+		return extension.getMinecraftProvider().getVersionInfo().libraries().stream()
 				.filter((MinecraftVersionMeta.Library::hasNativesForOS))
-				.map(MinecraftVersionMeta.Library::getClassifierForOS)
+				.map(MinecraftVersionMeta.Library::classifierForOS)
 				.filter(Objects::nonNull)
 				.collect(Collectors.toList());
 	}

src/main/java/net/fabricmc/loom/configuration/providers/minecraft/MinecraftVersionMeta.java

@@ -29,108 +29,35 @@ import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 
-import com.google.gson.JsonObject;
-
 import net.fabricmc.loom.util.OperatingSystem;
 
 @SuppressWarnings("unused")
-public final class MinecraftVersionMeta {
+public record MinecraftVersionMeta(
-	private JsonObject arguments;
+		Object arguments,
-	private AssetIndex assetIndex;
+		AssetIndex assetIndex,
-	private String assets;
+		String assets,
-	private int complianceLevel;
+		int complianceLevel,
-	private Map<String, Download> downloads;
+		Map<String, Download> downloads,
-	private String id;
+		String id,
-	private List<Library> libraries;
+		List<Library> libraries,
-	private JsonObject logging;
+		Object logging,
-	private String mainClass;
+		String mainClass,
-	private int minimumLauncherVersion;
+		int minimumLauncherVersion,
-	private String releaseTime;
+		String releaseTime,
-	private String time;
+		String time,
-	private String type;
+		String type
-
+) {
-	public Download getDownload(String key) {
+	public Download download(String key) {
-		return getDownloads().get(key);
+		return downloads().get(key);
 	}
 
-	public JsonObject getArguments() {
+	public record AssetIndex(String id, long totalSize, String path, String sha1, long size, String url) {
-		return arguments;
+		public String fabricId(String version) {
-	}
-
-	public AssetIndex getAssetIndex() {
-		return assetIndex;
-	}
-
-	public String getAssets() {
-		return assets;
-	}
-
-	public int getComplianceLevel() {
-		return complianceLevel;
-	}
-
-	public Map<String, Download> getDownloads() {
-		return downloads;
-	}
-
-	public String getId() {
-		return id;
-	}
-
-	public List<Library> getLibraries() {
-		return libraries;
-	}
-
-	public JsonObject getLogging() {
-		return logging;
-	}
-
-	public String getMainClass() {
-		return mainClass;
-	}
-
-	public int getMinimumLauncherVersion() {
-		return minimumLauncherVersion;
-	}
-
-	public String getReleaseTime() {
-		return releaseTime;
-	}
-
-	public String getTime() {
-		return time;
-	}
-
-	public String getType() {
-		return type;
-	}
-
-	public final class AssetIndex extends Downloadable {
-		private String id;
-		private long totalSize;
-
-		public String getFabricId(String version) {
 			return id.equals(version) ? version : version + "-" + id;
 		}
-
-		public String getId() {
-			return id;
-		}
-
-		public long getTotalSize() {
-			return totalSize;
-		}
 	}
 
-	public final class Download extends Downloadable {
+	public record Library(Downloads downloads, String name, Map<String, String> natives, List<Rule> rules, Object extract) {
-	}
-
-	public final class Library {
-		private Downloads downloads;
-		private String name;
-		private Map<String, String> natives;
-		private List<Rule> rules;
-
 		public boolean isValidForOS() {
 			if (rules == null || rules.isEmpty()) {
 				return true;
@@ -161,117 +88,45 @@ public final class MinecraftVersionMeta {
 			return isValidForOS();
 		}
 
-		public Classifier getClassifierForOS() {
+		public Download classifierForOS() {
-			return getDownloads().getClassifier(natives.get(OperatingSystem.getOS()));
+			return downloads().classifier(natives.get(OperatingSystem.getOS()));
 		}
 
-		public Downloads getDownloads() {
+		public Download artifact() {
-			return downloads;
+			if (downloads() == null) {
-		}
-
-		public Artifact getArtifact() {
-			if (getDownloads() == null) {
 				return null;
 			}
 
-			return getDownloads().getArtifact();
+			return downloads().artifact();
-		}
-
-		public String getName() {
-			return name;
-		}
-
-		public Map<String, String> getNatives() {
-			return natives;
-		}
-
-		public List<Rule> getRules() {
-			return rules;
 		}
 	}
 
-	public final class Downloads {
+	public record Downloads(Download artifact, Map<String, Download> classifiers) {
-		private Artifact artifact;
+		public Download classifier(String os) {
-		private Map<String, Classifier> classifiers;
-
-		public Classifier getClassifier(String os) {
 			return classifiers.get(os);
 		}
-
-		public Artifact getArtifact() {
-			return artifact;
-		}
-
-		public Map<String, Classifier> getClassifiers() {
-			return classifiers;
-		}
 	}
 
-	public final class Artifact extends Downloadable {
+	public record Rule(String action, OS os) {
-	}
-
-	public final class Classifier extends Downloadable {
-	}
-
-	public final class Rule {
-		private String action;
-		private OS os;
-
 		public boolean appliesToOS() {
-			return getOS() == null || getOS().isValidForOS();
+			return os() == null || os().isValidForOS();
 		}
 
 		public boolean isAllowed() {
-			return getAction().equals("allow");
+			return action().equals("allow");
-		}
-
-		public String getAction() {
-			return action;
-		}
-
-		public OS getOS() {
-			return os;
 		}
 	}
 
-	public final class OS {
+	public record OS(String name) {
-		private String name;
-
 		public boolean isValidForOS() {
-			return getName() == null || getName().equalsIgnoreCase(OperatingSystem.getOS());
+			return name() == null || name().equalsIgnoreCase(OperatingSystem.getOS());
-		}
-
-		public String getName() {
-			return name;
 		}
 	}
 
-	// A base class for everything that can be downloaded
+	public record Download(String path, String sha1, long size, String url) {
-	public abstract class Downloadable {
+		public File relativeFile(File baseDirectory) {
-		private String path;
+			Objects.requireNonNull(path(), "Cannot get relative file from a null path");
-		private String sha1;
+			return new File(baseDirectory, path());
-		private long size;
-		private String url;
-
-		public File getRelativeFile(File baseDirectory) {
-			Objects.requireNonNull(getPath(), "Cannot get relative file from a null path");
-			return new File(baseDirectory, getPath());
-		}
-
-		public String getPath() {
-			return path;
-		}
-
-		public String getSha1() {
-			return sha1;
-		}
-
-		public long getSize() {
-			return size;
-		}
-
-		public String getUrl() {
-			return url;
 		}
 	}
 }

src/main/java/net/fabricmc/loom/configuration/providers/minecraft/assets/AssetIndex.java

@@ -30,23 +30,12 @@ import java.util.Map;
 import java.util.Set;
 
 @SuppressWarnings("unused")
-public class AssetIndex {
+public record AssetIndex(Map<String, AssetObject> objects, boolean virtual) {
-	private final Map<String, AssetObject> objects;
-	private boolean virtual;
-
 	public AssetIndex() {
-		this.objects = new LinkedHashMap<>();
+		this(new LinkedHashMap<>(), false);
-	}
-
-	public Map<String, AssetObject> getFileMap() {
-		return this.objects;
 	}
 
 	public Set<AssetObject> getUniqueObjects() {
 		return new HashSet<>(this.objects.values());
 	}
-
-	public boolean isVirtual() {
-		return this.virtual;
-	}
 }

src/main/java/net/fabricmc/loom/configuration/providers/minecraft/assets/AssetObject.java

@@ -25,34 +25,5 @@
 package net.fabricmc.loom.configuration.providers.minecraft.assets;
 
 @SuppressWarnings("unused")
-public class AssetObject {
+public record AssetObject(String hash, long size) {
-	private String hash;
-	private long size;
-
-	public String getHash() {
-		return this.hash;
-	}
-
-	public long getSize() {
-		return this.size;
-	}
-
-	@Override
-	public boolean equals(Object o) {
-		if (this == o) {
-			return true;
-		} else if ((o == null) || (getClass() != o.getClass())) {
-			return false;
-		} else {
-			AssetObject that = (AssetObject) o;
-			return this.size == that.size && this.hash.equals(that.hash);
-		}
-	}
-
-	@Override
-	public int hashCode() {
-		int result = this.hash.hashCode();
-		result = 31 * result + (int) (this.size ^ this.size >>> 32);
-		return result;
-	}
 }

src/main/java/net/fabricmc/loom/configuration/providers/minecraft/assets/MinecraftAssetsProvider.java

@@ -53,7 +53,7 @@ public class MinecraftAssetsProvider {
 		boolean offline = project.getGradle().getStartParameter().isOffline();
 
 		MinecraftVersionMeta versionInfo = minecraftProvider.getVersionInfo();
-		MinecraftVersionMeta.AssetIndex assetIndex = versionInfo.getAssetIndex();
+		MinecraftVersionMeta.AssetIndex assetIndex = versionInfo.assetIndex();
 
 		// get existing cache files
 		File assets = new File(extension.getUserCache(), "assets");
@@ -62,7 +62,7 @@ public class MinecraftAssetsProvider {
 			assets.mkdirs();
 		}
 
-		File assetsInfo = new File(assets, "indexes" + File.separator + assetIndex.getFabricId(minecraftProvider.getMinecraftVersion()) + ".json");
+		File assetsInfo = new File(assets, "indexes" + File.separator + assetIndex.fabricId(minecraftProvider.getMinecraftVersion()) + ".json");
 
 		project.getLogger().info(":downloading asset index");
 
@@ -75,7 +75,7 @@ public class MinecraftAssetsProvider {
 				throw new GradleException("Asset index not found at " + assetsInfo.getAbsolutePath());
 			}
 		} else {
-			HashedDownloadUtil.downloadIfInvalid(new URL(assetIndex.getUrl()), assetsInfo, assetIndex.getSha1(), project.getLogger(), false);
+			HashedDownloadUtil.downloadIfInvalid(new URL(assetIndex.url()), assetsInfo, assetIndex.sha1(), project.getLogger(), false);
 		}
 
 		Deque<ProgressLogger> loggers = new ConcurrentLinkedDeque<>();
@@ -84,16 +84,16 @@ public class MinecraftAssetsProvider {
 		AssetIndex index;
 
 		try (FileReader fileReader = new FileReader(assetsInfo)) {
-			index = LoomGradlePlugin.GSON.fromJson(fileReader, AssetIndex.class);
+			index = LoomGradlePlugin.OBJECT_MAPPER.readValue(fileReader, AssetIndex.class);
 		}
 
 		Stopwatch stopwatch = Stopwatch.createStarted();
 
-		Map<String, AssetObject> parent = index.getFileMap();
+		Map<String, AssetObject> parent = index.objects();
 
 		for (Map.Entry<String, AssetObject> entry : parent.entrySet()) {
 			AssetObject object = entry.getValue();
-			String sha1 = object.getHash();
+			String sha1 = object.hash();
 			String filename = "objects" + File.separator + sha1.substring(0, 2) + File.separator + sha1;
 			File file = new File(assets, filename);
 

src/main/java/net/fabricmc/loom/decompilers/LineNumberRemapper.java

@@ -89,7 +89,7 @@ public class LineNumberRemapper {
 	}
 
 	public void process(ProgressLogger logger, Path input, Path output) throws IOException {
-		Files.walkFileTree(input, new SimpleFileVisitor<Path>() {
+		Files.walkFileTree(input, new SimpleFileVisitor<>() {
 			@Override
 			public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
 				String rel = input.relativize(file).toString();

src/main/java/net/fabricmc/loom/decompilers/cfr/FabricCFRDecompiler.java

@@ -54,7 +54,6 @@ import java.util.zip.ZipFile;
 
 import com.google.common.base.Charsets;
 import com.google.common.collect.ImmutableMap;
-import com.google.common.io.ByteStreams;
 import org.benf.cfr.reader.api.CfrDriver;
 import org.benf.cfr.reader.api.ClassFileSource;
 import org.benf.cfr.reader.api.OutputSinkFactory;
@@ -134,36 +133,29 @@ public class FabricCFRDecompiler implements LoomDecompiler {
 							}
 
 							try (InputStream inputStream = inputZip.getInputStream(zipEntry)) {
-								return Pair.make(ByteStreams.toByteArray(inputStream), path);
+								return Pair.make(inputStream.readAllBytes(), path);
 							}
 						}
 					})
 					.withOutputSink(new OutputSinkFactory() {
 						@Override
 						public List<SinkClass> getSupportedSinks(SinkType sinkType, Collection<SinkClass> available) {
-							switch (sinkType) {
+							return switch (sinkType) {
-								case PROGRESS:
+								case PROGRESS -> Collections.singletonList(SinkClass.STRING);
-									return Collections.singletonList(SinkClass.STRING);
+								case JAVA -> Collections.singletonList(SinkClass.DECOMPILED);
-								case JAVA:
+								default -> Collections.emptyList();
-									return Collections.singletonList(SinkClass.DECOMPILED);
+							};
-								default:
-									return Collections.emptyList();
-							}
 						}
 
 						@SuppressWarnings("unchecked")
 						@Override
 						public <T> Sink<T> getSink(SinkType sinkType, SinkClass sinkClass) {
-							switch (sinkType) {
+							return switch (sinkType) {
-								case PROGRESS:
+								case PROGRESS -> (p) -> project.getLogger().debug((String) p);
-									return (p) -> project.getLogger().debug((String) p);
+								case JAVA -> (Sink<T>) decompiledSink(jos, addedDirectories);
-								case JAVA:
+								case EXCEPTION -> (e) -> project.getLogger().error((String) e);
-									return (Sink<T>) decompiledSink(jos, addedDirectories);
+								default -> null;
-								case EXCEPTION:
+							};
-									return (e) -> project.getLogger().error((String) e);
-							}
-
-							return null;
 						}
 					})
 					.build();
@@ -173,7 +165,7 @@ public class FabricCFRDecompiler implements LoomDecompiler {
 									.filter(input -> input.endsWith(".class"))
 									.collect(Collectors.toList());
 
-			ExecutorService executorService = Executors.newFixedThreadPool(metaData.numberOfThreads);
+			ExecutorService executorService = Executors.newFixedThreadPool(metaData.numberOfThreads());
 			List<Future<?>> futures = new LinkedList<>();
 
 			for (String clazz : classes) {

src/main/java/net/fabricmc/loom/decompilers/fernflower/AbstractFernFlowerDecompiler.java

@@ -65,12 +65,12 @@ public abstract class AbstractFernFlowerDecompiler implements LoomDecompiler {
 
 		project.getLogging().captureStandardOutput(LogLevel.LIFECYCLE);
 
-		Map<String, Object> options = new HashMap<String, Object>() {{
+		Map<String, Object> options = new HashMap<>() {{
 				put(IFernflowerPreferences.DECOMPILE_GENERIC_SIGNATURES, "1");
 				put(IFernflowerPreferences.BYTECODE_SOURCE_MAPPING, "1");
 				put(IFernflowerPreferences.REMOVE_SYNTHETIC, "1");
 				put(IFernflowerPreferences.LOG_LEVEL, "trace");
-				put(IFernflowerPreferences.THREADS, metaData.numberOfThreads);
+				put(IFernflowerPreferences.THREADS, metaData.numberOfThreads());
 			}};
 
 		List<String> args = new ArrayList<>();
@@ -79,10 +79,10 @@ public abstract class AbstractFernFlowerDecompiler implements LoomDecompiler {
 		args.add(absolutePathOf(compiledJar));
 		args.add("-o=" + absolutePathOf(sourcesDestination));
 		args.add("-l=" + absolutePathOf(linemapDestination));
-		args.add("-m=" + absolutePathOf(metaData.javaDocs));
+		args.add("-m=" + absolutePathOf(metaData.javaDocs()));
 
 		// TODO, Decompiler breaks on jemalloc, J9 module-info.class?
-		for (Path library : metaData.libraries) {
+		for (Path library : metaData.libraries()) {
 			args.add("-e=" + absolutePathOf(library));
 		}
 

src/main/java/net/fabricmc/loom/task/GenVsCodeProjectTask.java

@@ -30,13 +30,11 @@ import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
 
-import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
 import org.apache.commons.io.FileUtils;
 import org.gradle.api.Project;
 import org.gradle.api.tasks.TaskAction;
 
-import net.fabricmc.loom.LoomGradleExtension;
+import net.fabricmc.loom.LoomGradlePlugin;
 import net.fabricmc.loom.configuration.ide.RunConfig;
 import net.fabricmc.loom.configuration.ide.RunConfigSettings;
 
@@ -48,7 +46,6 @@ public class GenVsCodeProjectTask extends AbstractLoomTask {
 	@TaskAction
 	public void genRuns() {
 		Project project = getProject();
-		LoomGradleExtension extension = getExtension();
 		File projectDir = project.file(".vscode");
 
 		if (!projectDir.exists()) {
@@ -72,8 +69,7 @@ public class GenVsCodeProjectTask extends AbstractLoomTask {
 			settings.makeRunDir();
 		}
 
-		Gson gson = new GsonBuilder().setPrettyPrinting().create();
+		String json = LoomGradlePlugin.GSON.toJson(launch);
-		String json = gson.toJson(launch);
 
 		try {
 			FileUtils.writeStringToFile(launchJson, json, StandardCharsets.UTF_8);

src/main/java/net/fabricmc/loom/util/Constants.java

@@ -34,7 +34,7 @@ import net.fabricmc.loom.configuration.RemappedConfigurationEntry;
 
 public class Constants {
 	public static final String LIBRARIES_BASE = "https://libraries.minecraft.net/";
-	public static final String RESOURCES_BASE = "http://resources.download.minecraft.net/";
+	public static final String RESOURCES_BASE = "https://resources.download.minecraft.net/";
 	public static final String VERSION_MANIFESTS = "https://launchermeta.mojang.com/mc/game/version_manifest_v2.json";
 
 	public static final String SYSTEM_ARCH = System.getProperty("os.arch").equals("64") ? "64" : "32";

src/main/java/net/fabricmc/loom/util/GroovyXmlUtil.java

@@ -36,8 +36,8 @@ public final class GroovyXmlUtil {
 
 	public static Node getOrCreateNode(Node parent, String name) {
 		for (Object object : parent.children()) {
-			if (object instanceof Node && isSameName(((Node) object).name(), name)) {
+			if (object instanceof Node node && isSameName(node.name(), name)) {
-				return (Node) object;
+				return node;
 			}
 		}
 
@@ -46,8 +46,8 @@ public final class GroovyXmlUtil {
 
 	public static Optional<Node> getNode(Node parent, String name) {
 		for (Object object : parent.children()) {
-			if (object instanceof Node && isSameName(((Node) object).name(), name)) {
+			if (object instanceof Node node && isSameName(node.name(), name)) {
-				return Optional.of((Node) object);
+				return Optional.of(node);
 			}
 		}
 
@@ -59,13 +59,13 @@ public final class GroovyXmlUtil {
 			return nodeName.equals(givenName);
 		}
 
-		if (nodeName instanceof QName) {
+		if (nodeName instanceof QName qName) {
-			return ((QName) nodeName).matches(givenName);
+			return qName.matches(givenName);
 		}
 
 		// New groovy 3 (gradle 7) class
-		if (nodeName instanceof groovy.namespace.QName) {
+		if (nodeName instanceof groovy.namespace.QName qName) {
-			return ((groovy.namespace.QName) nodeName).matches(givenName);
+			return qName.matches(givenName);
 		}
 
 		throw new UnsupportedOperationException("Cannot determine if " + nodeName.getClass() + " is the same as a String");

src/main/java/net/fabricmc/loom/util/SourceRemapper.java

@@ -234,7 +234,7 @@ public class SourceRemapper {
 			}
 		} else {
 			for (RemappedConfigurationEntry entry : Constants.MOD_COMPILE_ENTRIES) {
-				for (File inputFile : project.getConfigurations().getByName(entry.getSourceConfiguration()).getFiles()) {
+				for (File inputFile : project.getConfigurations().getByName(entry.sourceConfiguration()).getFiles()) {
 					m.getClassPath().add(inputFile.toPath());
 				}
 			}

src/main/java/net/fabricmc/loom/util/StaticPathWatcher.java

@@ -61,8 +61,8 @@ public final class StaticPathWatcher {
 			for (WatchEvent<?> event : key.pollEvents()) {
 				Object ctx = event.context();
 
-				if (ctx instanceof Path) {
+				if (ctx instanceof Path path) {
-					changeCache.put(((Path) ctx).toAbsolutePath(), true);
+					changeCache.put(path.toAbsolutePath(), true);
 				}
 			}
 		}