fix loading (restore previous functionality)

src/main/java/dev/frogmc/frogloader/api/FrogLoader.java

@@ -30,11 +30,11 @@ public interface FrogLoader {
 	}
 
 	/**
-	 * Get all loaded game plugins.
+	 * Get the currently loaded game plugin.
 	 *
-	 * @return A collection of all loaded game plugins
+	 * @return The game plugin applicable to the current game
 	 */
-	Collection<FrogGamePlugin> getGamePlugins();
+	FrogGamePlugin getGamePlugin();
 
 	/**
 	 * Get all loaded mod providers.
@@ -43,8 +43,6 @@ public interface FrogLoader {
 	 */
 	Collection<FrogModProvider> getModProviders();
 
-	//Collection<FrogPlugin> getPlugins();
-
 	/**
 	 * Get the current (physical) environment.
 	 *
@@ -70,11 +68,11 @@ public interface FrogLoader {
 	Path getConfigDir();
 
 	/**
-	 * Get the current mods directory.
+	 * Get the current mods directories.
 	 *
-	 * @return The current mods directory
+	 * @return The current mods directories
 	 */
-	Path getModsDir();
+	Collection<Path> getModsDirs();
 
 	/**
 	 * Query whether this loader is currently running in a development environment.
@@ -108,4 +106,10 @@ public interface FrogLoader {
 	 * @see FrogPlugin
 	 */
 	Collection<ModProperties> getMods();
+
+	/**
+	 * Get the version of the currently loaded game
+	 * @return The current game version
+	 */
+	String getGameVersion();
 }

src/main/java/dev/frogmc/frogloader/api/mod/ModExtensions.java

@@ -3,8 +3,8 @@ package dev.frogmc.frogloader.api.mod;
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
 import java.lang.invoke.MethodType;
-import java.util.Map;
 import java.util.Collection;
+import java.util.Map;
 import java.util.function.Consumer;
 
 import org.slf4j.Logger;
@@ -70,10 +70,13 @@ public final class ModExtensions {
 	 * @param action the action to run on the value of the extension if it is present
 	 * @param <T>    The type of the value of this extension
 	 */
+	@SuppressWarnings({"rawtypes", "unchecked"})
 	public <T> void runIfPresent(String key, Consumer<T> action) {
-		T value = get(key);
-		if (value != null) {
-			action.accept(value);
+		Object value = get(key);
+		if (value instanceof Collection c){
+			((Collection<T>)c).forEach(action);
+		} else if (value != null) {
+			action.accept((T)value);
 		}
 	}
 

src/main/java/dev/frogmc/frogloader/api/mod/ModProperties.java

@@ -79,6 +79,7 @@ public interface ModProperties {
 
 	/**
 	 * Get this mod's paths
+	 *
 	 * @return Where this mod is loaded from
 	 */
 	Collection<Path> paths();

src/main/java/dev/frogmc/frogloader/api/plugin/FrogGamePlugin.java

@@ -1,6 +1,7 @@
 package dev.frogmc.frogloader.api.plugin;
 
 import dev.frogmc.frogloader.api.FrogLoader;
+import dev.frogmc.frogloader.api.mod.ModProperties;
 
 public interface FrogGamePlugin {
 	default void run() {
@@ -12,4 +13,10 @@ public interface FrogGamePlugin {
 
 	default void init(FrogLoader loader) throws Exception {
 	}
+
+	String queryVersion();
+
+	default ModProperties getGameMod() {
+		return null;
+	}
 }

src/main/java/dev/frogmc/frogloader/api/plugin/FrogModProvider.java

@@ -1,9 +1,10 @@
 package dev.frogmc.frogloader.api.plugin;
 
-import dev.frogmc.frogloader.api.mod.ModProperties;
-
 import java.nio.file.Path;
 import java.util.Collection;
+import java.util.Collections;
+
+import dev.frogmc.frogloader.api.mod.ModProperties;
 
 public interface FrogModProvider {
 	String id();
@@ -20,9 +21,14 @@ public interface FrogModProvider {
 		return false;
 	}
 
-    default void initMods(Collection<ModProperties> mods) {};
+	default boolean isDirectoryApplicable(Path path) {
+		return false;
+	}
 
-    default ModProperties loadMod(Path path) {
-        return null;
+	default void preLaunch(Collection<ModProperties> mods) {
+	}
+
+	default Collection<ModProperties> loadMods(Collection<Path> modFiles) throws Exception {
+		return Collections.emptySet();
 	}
 }

src/main/java/dev/frogmc/frogloader/api/plugin/FrogPlugin.java

@@ -2,7 +2,6 @@ package dev.frogmc.frogloader.api.plugin;
 
 import java.util.Collection;
 import java.util.Collections;
-import java.util.List;
 
 import dev.frogmc.frogloader.api.FrogLoader;
 import dev.frogmc.frogloader.api.mod.ModProperties;

src/main/java/dev/frogmc/frogloader/impl/FrogLoaderImpl.java

@@ -1,22 +1,5 @@
 package dev.frogmc.frogloader.impl;
 
-import com.google.gson.Gson;
-import dev.frogmc.frogloader.api.FrogLoader;
-import dev.frogmc.frogloader.api.env.Env;
-import dev.frogmc.frogloader.api.mod.ModProperties;
-import dev.frogmc.frogloader.api.plugin.FrogGamePlugin;
-import dev.frogmc.frogloader.api.plugin.FrogModProvider;
-import dev.frogmc.frogloader.api.plugin.FrogPlugin;
-import dev.frogmc.frogloader.impl.gui.LoaderGui;
-import dev.frogmc.frogloader.impl.launch.MixinClassLoader;
-import dev.frogmc.frogloader.impl.mod.ModUtil;
-import dev.frogmc.frogloader.impl.util.CrashReportGenerator;
-import dev.frogmc.frogloader.impl.util.SystemProperties;
-import lombok.Getter;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.spongepowered.asm.mixin.MixinEnvironment;
-
 import java.io.IOException;
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
@@ -27,8 +10,27 @@ import java.nio.file.Paths;
 import java.util.*;
 import java.util.stream.Collectors;
 
+import com.google.gson.Gson;
+import dev.frogmc.frogloader.api.FrogLoader;
+import dev.frogmc.frogloader.api.env.Env;
+import dev.frogmc.frogloader.api.mod.ModProperties;
+import dev.frogmc.frogloader.api.plugin.FrogGamePlugin;
+import dev.frogmc.frogloader.api.plugin.FrogModProvider;
+import dev.frogmc.frogloader.impl.gui.LoaderGui;
+import dev.frogmc.frogloader.impl.launch.MixinClassLoader;
+import dev.frogmc.frogloader.impl.mixin.AWProcessor;
+import dev.frogmc.frogloader.impl.mod.BuiltinExtensions;
+import dev.frogmc.frogloader.impl.mod.ModUtil;
+import dev.frogmc.frogloader.impl.util.CrashReportGenerator;
+import dev.frogmc.frogloader.impl.util.SystemProperties;
+import lombok.Getter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.spongepowered.asm.mixin.MixinEnvironment;
+import org.spongepowered.asm.mixin.Mixins;
+
 public class FrogLoaderImpl implements FrogLoader {
-    public static final String MOD_FILE_EXTENSION = ".frogmod";
+
 	private static final boolean DEV_ENV = Boolean.getBoolean(SystemProperties.DEVELOPMENT);
 	@Getter
 	private static FrogLoaderImpl instance;
@@ -38,17 +40,16 @@ public class FrogLoaderImpl implements FrogLoader {
 	private final Env env;
 	private final Logger LOGGER = LoggerFactory.getLogger("FrogLoader");
 
-//    @Getter
-//    private final List<FrogPlugin> plugins = new ArrayList<>();
-
 	@Getter
-    private final Collection<FrogGamePlugin> gamePlugins = new ArrayList<>();
+	private FrogGamePlugin gamePlugin;
 
 	@Getter
 	private final Collection<FrogModProvider> modProviders = new ArrayList<>();
 
 	@Getter
-    private final Path gameDir, configDir, modsDir;
+	private final Path gameDir, configDir;
+	@Getter
+	private final Collection<Path> modsDirs = new HashSet<>();
 
 	@Getter
 	private final MixinClassLoader classloader;
@@ -56,9 +57,10 @@ public class FrogLoaderImpl implements FrogLoader {
 	@Getter
 	private final Gson gson = new Gson();
 
-    // Map<Provider ID, Map<Mod ID, ModProperties>>
-    private Map<String, Map<String, ModProperties>> mods = new HashMap<>();
-    //    private Map<String, ModProperties> mods;
+	@Getter
+	private String gameVersion;
+
+	private final Map<String, Map<String, ModProperties>> mods = new HashMap<>();
 	private Collection<String> modIds = new ArrayList<>();
 
 
@@ -70,12 +72,10 @@ public class FrogLoaderImpl implements FrogLoader {
 
 		gameDir = Paths.get(getArgumentOrElse("gameDir", "."));
 		configDir = gameDir.resolve("config");
-        modsDir = gameDir.resolve("mods");
 
 		try {
 			Files.createDirectories(gameDir);
 			Files.createDirectories(configDir);
-            Files.createDirectories(modsDir);
 		} catch (IOException e) {
 			LOGGER.warn("Failed to create essential directories ", e);
 		}
@@ -83,12 +83,13 @@ public class FrogLoaderImpl implements FrogLoader {
 		try {
 			discoverGamePlugins();
 			discoverModProviders();
+			modProviders.stream().map(FrogModProvider::loadDirectory).map(gameDir::resolve).forEach(modsDirs::add);
 			advanceMixinState();
 			modIds = collectModIds();
 			LOGGER.info(ModUtil.getModList(getMods()));
 			LOGGER.info("Launching...");
-            gamePlugins.forEach(FrogGamePlugin::run);
-            modProviders.forEach(m -> m.initMods(mods.get(m.id()).values()));
+			modProviders.forEach(plugin -> plugin.preLaunch(mods.get(plugin.id()).values()));
+			gamePlugin.run();
 		} catch (Throwable t) {
 			LoaderGui.execReport(CrashReportGenerator.writeReport(t, getMods()), false);
 		}
@@ -115,40 +116,47 @@ public class FrogLoaderImpl implements FrogLoader {
 
 	private void discoverModProviders() {
 		LOGGER.info("Discovering mod providers...");
-        ServiceLoader<FrogModProvider> loader = ServiceLoader.load(FrogModProvider.class);
-        loader.stream().map(ServiceLoader.Provider::get).forEach(p -> LOGGER.info("Found mod provider: " + p.getClass().getName()));
-        FrogModProvider[] applicableProviders = ServiceLoader.load(FrogModProvider.class).stream().map(ServiceLoader.Provider::get).filter(FrogModProvider::isApplicable).toArray(FrogModProvider[]::new);
 
-        for (FrogModProvider plugin : applicableProviders) {
-            try {
-                LOGGER.info("Initialising mod provider: " + plugin.id());
-                Map<String, ModProperties> modsFromProvider = new HashMap<>();
-                Collection<Path> paths = Discovery.find(gameDir.resolve(plugin.loadDirectory()), p -> false, plugin::isFileApplicable);
-                paths.forEach(p -> {
-                    LOGGER.info("Loading mod: " + p);
-                    try {
-                        ModProperties mod = plugin.loadMod(p);
-                        modsFromProvider.put(mod.id(), mod);
-                    } catch (Throwable e) {
-                        LOGGER.error("Error during mod initialisation: ", e);
-                        throw new RuntimeException(e);
+		for (FrogModProvider plugin : ServiceLoader.load(FrogModProvider.class)) {
+			LOGGER.debug("Found mod provider: {}", plugin.getClass().getName());
+			if (!plugin.isApplicable()) {
+				continue;
 			}
-                });
-                LOGGER.info("Loaded " + modsFromProvider.size() + " mods from provider: " + plugin.id());
+			try {
+				LOGGER.debug("Initialising mod provider: {}", plugin.id());
+				Map<String, ModProperties> modsFromProvider = new HashMap<>();
+				Collection<ModProperties> loadedMods = plugin.loadMods(Discovery.find(gameDir.resolve(plugin.loadDirectory()), plugin::isDirectoryApplicable, plugin::isFileApplicable));
+				initModMixins(loadedMods);
+				AWProcessor.load(loadedMods);
+
+				loadedMods.forEach(m -> modsFromProvider.put(m.id(), m));
+
+				LOGGER.debug("Loaded {} mod(s) from provider: {}", modsFromProvider.size(), plugin.id());
 				mods.put(plugin.id(), modsFromProvider);
 				modIds.addAll(modsFromProvider.keySet());
 				modProviders.add(plugin);
 			} catch (Throwable e) {
 				LOGGER.error("Error during plugin initialisation: ", e);
-                throw new RuntimeException(e);
 			}
 		}
 	}
 
+	@SuppressWarnings({"rawtypes", "unchecked"})
+	private void initModMixins(Collection<ModProperties> loadedMods) {
+		loadedMods.forEach(props -> {
+			Object o = props.extensions().get(BuiltinExtensions.MIXIN_CONFIG);
+			if (o instanceof String name) {
+				Mixins.addConfiguration(name);
+			} else if (o instanceof Collection l) {
+				((Collection<String>) l).forEach(Mixins::addConfiguration);
+			}
+		});
+	}
+
 	private void discoverGamePlugins() {
 		LOGGER.info("Discovering game plugins...");
 		ServiceLoader<FrogGamePlugin> loader = ServiceLoader.load(FrogGamePlugin.class);
-        loader.stream().map(ServiceLoader.Provider::get).forEach(p -> LOGGER.info("Found game plugin: " + p.getClass().getName()));
+		loader.stream().map(ServiceLoader.Provider::get).forEach(p -> LOGGER.info("Found game plugin: {}", p.getClass().getName()));
 		FrogGamePlugin[] applicablePlugins = ServiceLoader.load(FrogGamePlugin.class).stream().map(ServiceLoader.Provider::get).filter(FrogGamePlugin::isApplicable).toArray(FrogGamePlugin[]::new);
 		if (applicablePlugins.length > 1) {
 			throw new IllegalStateException("Multiple applicable game plugins found!");
@@ -156,35 +164,22 @@ public class FrogLoaderImpl implements FrogLoader {
 			throw new IllegalStateException("No applicable game plugin found!");
 		}
 
-        for (FrogGamePlugin plugin : applicablePlugins) {
+		FrogGamePlugin plugin = applicablePlugins[0]; // we can skip the loop as we always will only have one element
 		try {
 			plugin.init(this);
-                gamePlugins.add(plugin);
+			gameVersion = plugin.queryVersion();
+			ModProperties gameMod = plugin.getGameMod();
+			if (gameMod != null) {
+				mods.put("integrated", Map.of(gameMod.id(), gameMod));
+				modIds.add(gameMod.id());
+			}
+			gamePlugin = plugin;
 		} catch (Throwable e) {
 			LOGGER.error("Error during plugin initialisation: ", e);
 			throw new RuntimeException(e);
 		}
-        }
-    }
 
-
-    /*private void discoverPlugins() {
-        ServiceLoader.load(FrogPlugin.class).forEach(plugin -> {
-            try {
-                if (plugin.isApplicable()) {
-                    plugin.init(this);
-                    plugins.add(plugin);
 	}
-            } catch (Throwable e) {
-                LOGGER.error("Error during plugin initialisation: ", e);
-                throw new RuntimeException(e);
-            }
-        });
-
-        if (plugins.isEmpty()) {
-            throw new IllegalStateException("No plugin applicable to the current state was found!");
-        }
-    }*/
 
 	public String getArgument(String name) {
 		for (int i = 0; i < args.length - 1; i += 2) {
@@ -218,10 +213,6 @@ public class FrogLoaderImpl implements FrogLoader {
 		return mods.values().stream().flatMap(m -> m.values().stream()).filter(m -> m.id().equals(id)).findFirst();
 	}
 
-    /*private Map<String, ModProperties> collectMods() {
-        return plugins.stream().map(FrogPlugin::getMods).flatMap(Collection::stream).collect(Collectors.toMap(ModProperties::id, m -> m));
-    }*/
-
 	private Collection<String> collectModIds() {
 		return mods.values().stream().flatMap(m -> m.keySet().stream()).collect(Collectors.toSet());
 	}

src/main/java/dev/frogmc/frogloader/impl/gui/component/DependencyErrorEntry.java

@@ -1,14 +1,14 @@
 package dev.frogmc.frogloader.impl.gui.component;
 
-import dev.frogmc.frogloader.impl.mod.ModDependencyResolver;
-import org.jetbrains.annotations.Nullable;
-
 import javax.swing.*;
 import javax.swing.plaf.basic.BasicBorders;
 import java.awt.*;
 import java.awt.event.ActionListener;
 import java.net.URL;
 
+import dev.frogmc.frogloader.impl.mod.ModDependencyResolver;
+import org.jetbrains.annotations.Nullable;
+
 public class DependencyErrorEntry extends JPanel {
 
 	private final JPanel actions;

src/main/java/dev/frogmc/frogloader/impl/gui/page/BreakingDepPage.java

@@ -1,12 +1,12 @@
 package dev.frogmc.frogloader.impl.gui.page;
 
-import dev.frogmc.frogloader.impl.gui.component.DependencyErrorEntry;
-import dev.frogmc.frogloader.impl.mod.ModDependencyResolver;
-
 import javax.swing.*;
 import java.awt.*;
 import java.util.Objects;
 
+import dev.frogmc.frogloader.impl.gui.component.DependencyErrorEntry;
+import dev.frogmc.frogloader.impl.mod.ModDependencyResolver;
+
 public class BreakingDepPage extends JScrollPane {
 
 	public BreakingDepPage(ModDependencyResolver.BreakingModException ex) {

src/main/java/dev/frogmc/frogloader/impl/gui/page/UnfulfilledDepPage.java

@@ -1,15 +1,15 @@
 package dev.frogmc.frogloader.impl.gui.page;
 
-import dev.frogmc.frogloader.impl.gui.component.DependencyErrorEntry;
-import dev.frogmc.frogloader.impl.mod.ModDependencyResolver;
-import dev.frogmc.frogloader.impl.util.PlatformUtil;
-
 import javax.swing.*;
 import java.awt.*;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.Objects;
 
+import dev.frogmc.frogloader.impl.gui.component.DependencyErrorEntry;
+import dev.frogmc.frogloader.impl.mod.ModDependencyResolver;
+import dev.frogmc.frogloader.impl.util.PlatformUtil;
+
 public class UnfulfilledDepPage extends JScrollPane {
 
 	public UnfulfilledDepPage(ModDependencyResolver.UnfulfilledDependencyException ex) {

src/main/java/dev/frogmc/frogloader/impl/mod/ModDependencyResolver.java

@@ -6,7 +6,8 @@ import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
-import com.google.common.collect.*;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.MultimapBuilder;
 import dev.frogmc.frogloader.api.mod.ModDependencies;
 import dev.frogmc.frogloader.api.mod.ModProperties;
 import dev.frogmc.frogloader.api.mod.SemVer;

src/main/java/dev/frogmc/frogloader/impl/mod/ModUtil.java

@@ -60,7 +60,7 @@ public class ModUtil {
 					}
 				}
 			} else {
-				children.computeIfAbsent(mod, m -> new HashSet<>());
+				children.putIfAbsent(mod, Collections.emptySet());
 			}
 		}
 

src/main/java/dev/frogmc/frogloader/impl/plugin/game/minecraft/MinecraftGamePlugin.java

@@ -1,20 +1,26 @@
 package dev.frogmc.frogloader.impl.plugin.game.minecraft;
 
-import com.google.gson.JsonObject;
-import dev.frogmc.frogloader.api.FrogLoader;
-import dev.frogmc.frogloader.api.plugin.FrogGamePlugin;
-import dev.frogmc.frogloader.impl.FrogLoaderImpl;
-import dev.frogmc.frogloader.impl.util.SystemProperties;
-import dev.frogmc.thyroxine.Thyroxine;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import java.io.File;
 import java.io.IOException;
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
 import java.lang.invoke.MethodType;
 import java.nio.file.*;
+import java.util.Collections;
+import java.util.Map;
+
+import com.google.gson.JsonObject;
+import dev.frogmc.frogloader.api.FrogLoader;
+import dev.frogmc.frogloader.api.mod.ModDependencies;
+import dev.frogmc.frogloader.api.mod.ModExtensions;
+import dev.frogmc.frogloader.api.mod.ModProperties;
+import dev.frogmc.frogloader.api.plugin.FrogGamePlugin;
+import dev.frogmc.frogloader.impl.FrogLoaderImpl;
+import dev.frogmc.frogloader.impl.mod.ModPropertiesImpl;
+import dev.frogmc.frogloader.impl.util.SystemProperties;
+import dev.frogmc.thyroxine.Thyroxine;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class MinecraftGamePlugin implements FrogGamePlugin {
 
@@ -118,4 +124,17 @@ public class MinecraftGamePlugin implements FrogGamePlugin {
 		var runtimePath = loader.isDevelopment() ? gamePath : remappedGamePath;
 		FrogLoaderImpl.getInstance().getClassloader().addURL(runtimePath.toUri().toURL());
 	}
+
+	@Override
+	public String queryVersion() {
+		return version;
+	}
+
+	public ModProperties getGameMod() {
+		return new ModPropertiesImpl("minecraft", "Minecraft", "/assets/minecraft/textures/block/grass_block_side.png",
+				MinecraftSemVerImpl.get(version), "MC-EULA",
+				Map.of("Mojang AB", Collections.singleton("Author")),
+				new ModDependencies(Collections.emptySet(), Collections.emptySet(), Collections.emptySet(), Collections.emptySet()),
+				ModExtensions.of(Collections.emptyMap()), Collections.emptySet());
+	}
 }

src/main/java/dev/frogmc/frogloader/impl/plugin/mod/FrogmodModProvider.java

@@ -1,22 +1,28 @@
 package dev.frogmc.frogloader.impl.plugin.mod;
 
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.nio.file.*;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.util.*;
+
+import com.electronwill.nightconfig.core.UnmodifiableConfig;
 import dev.frogmc.frogloader.api.FrogLoader;
 import dev.frogmc.frogloader.api.extensions.PreLaunchExtension;
 import dev.frogmc.frogloader.api.mod.ModProperties;
 import dev.frogmc.frogloader.api.plugin.FrogModProvider;
+import dev.frogmc.frogloader.impl.FrogLoaderImpl;
+import dev.frogmc.frogloader.impl.mod.BuiltinExtensions;
 import dev.frogmc.frogloader.impl.mod.ModPropertiesReader;
 import org.slf4j.Logger;
-
-import java.io.IOException;
-import java.nio.file.FileSystem;
-import java.nio.file.FileSystems;
-import java.nio.file.Path;
-import java.util.Collection;
+import org.slf4j.LoggerFactory;
 
 @SuppressWarnings("unused")
 public class FrogmodModProvider implements FrogModProvider {
 
-    Logger LOGGER = org.slf4j.LoggerFactory.getLogger("FrogModProvider");
+	public static final String MOD_FILE_EXTENSION = ".frogmod";
+
+	Logger LOGGER = LoggerFactory.getLogger("FrogModProvider");
 
 	@Override
 	public String id() {
@@ -30,12 +36,11 @@ public class FrogmodModProvider implements FrogModProvider {
 
 	@Override
 	public boolean isFileApplicable(Path path) {
-        if (!path.toString().endsWith(".frogmod")) {
-            LOGGER.info("File {} is not a frogmod file", path.toString());
+		if (!path.toString().endsWith(MOD_FILE_EXTENSION)) {
 			return false;
 		}
 		try (FileSystem fs = FileSystems.newFileSystem(path)) {
-            return fs.getPath("frog.mod.toml").toFile().exists();
+			return Files.exists(fs.getPath("frog.mod.toml"));
 		} catch (Exception e) {
 			LOGGER.error("Error while checking file {}", path, e);
 			return false;
@@ -43,20 +48,93 @@ public class FrogmodModProvider implements FrogModProvider {
 	}
 
 	@Override
-    public ModProperties loadMod(Path path) {
-        try (FileSystem fs = FileSystems.newFileSystem(path)) {
-            ModProperties prop =  ModPropertiesReader.readFile(fs.getPath("frog.mod.toml").toUri().toURL()).orElseThrow(IOException::new);
-//            prop.extensions().runIfPresent(PreLaunchExtension.ID, PreLaunchExtension.class, PreLaunchExtension::onPreLaunch);
-            return prop;
-        } catch (Exception e) {
-            throw new RuntimeException(e);
+	public boolean isDirectoryApplicable(Path path) {
+		return path.getFileName().toString().equals(FrogLoader.getInstance().getGameVersion());
+	}
+
+	@Override
+	public Collection<ModProperties> loadMods(Collection<Path> paths) throws Exception {
+		Path jijCache = getJijCacheDir();
+
+		Map<Path, ModProperties> mods = new HashMap<>();
+		Collection<Path> set = new HashSet<>(paths);
+		Collection<ModProperties> loadedMods = new HashSet<>();
+
+		this.getClass().getClassLoader().resources(ModPropertiesReader.PROPERTIES_FILE_NAME).map(ModPropertiesReader::readFile)
+				.map(o -> o.orElse(null)).filter(Objects::nonNull).forEach(loadedMods::add);
+
+		for (Path p : paths) {
+			findJiJMods(p, set, mods, jijCache);
+		}
+
+		set.stream().filter(mods::containsKey).map(path -> {
+			try {
+				return path.toUri().toURL();
+			} catch (MalformedURLException e) {
+				LOGGER.warn("Failed to resolve url for {}", path, e);
+				return null;
+			}
+		}).filter(Objects::nonNull).forEach(FrogLoaderImpl.getInstance().getClassloader()::addURL);
+
+		loadedMods.addAll(mods.values());
+
+		return loadedMods;
+	}
+
+	private Path getJijCacheDir(){
+		Path dir = FrogLoader.getInstance().getGameDir().resolve(".frogmc").resolve("jijcache");
+
+		Runtime.getRuntime().addShutdownHook(new Thread(() -> {
+			try {
+				Files.walkFileTree(dir, new SimpleFileVisitor<>(){
+					@Override
+					public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+						Files.delete(file);
+						return super.visitFile(file, attrs);
+					}
+
+					@Override
+					public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
+						Files.delete(dir);
+						return super.postVisitDirectory(dir, exc);
+					}
+				});
+			} catch (IOException e) {
+				LOGGER.error("Failed to clear extracted jij mods!", e);
+			}
+		}));
+
+		return dir;
+	}
+
+	protected void findJiJMods(Path mod, Collection<Path> mods, Map<Path, ModProperties> modPaths, Path jijCache) throws IOException {
+		Optional<ModProperties> opt = ModPropertiesReader.read(mod);
+		if (opt.isPresent()) {
+			ModProperties p = opt.get();
+			modPaths.put(mod, p);
+			List<List<UnmodifiableConfig>> entries = p.extensions().getOrDefault(BuiltinExtensions.INCLUDED_JARS, Collections.emptyList());
+			if (entries.isEmpty()) {
+				return;
+			}
+			try (FileSystem fs = FileSystems.newFileSystem(mod)) {
+				for (List<UnmodifiableConfig> jars : entries) {
+					for (UnmodifiableConfig jar : jars) {
+						Path path = fs.getPath(jar.get("path")).toAbsolutePath();
+						Path extracted = jijCache.resolve((String) jar.get("id"));
+						if (!Files.exists(extracted)){
+							Files.createDirectories(jijCache);
+							Files.copy(path, extracted);
+						}
+						mods.add(extracted);
+						findJiJMods(extracted, mods, modPaths, jijCache);
+					}
+				}
+			}
 		}
 	}
 
 	@Override
-    public void initMods(Collection<ModProperties> mods) {
-        mods.forEach(mod -> {
-            mod.extensions().runIfPresent(PreLaunchExtension.ID, PreLaunchExtension.class, PreLaunchExtension::onPreLaunch);
-        });
+	public void preLaunch(Collection<ModProperties> mods) {
+		mods.forEach(mod -> mod.extensions().runIfPresent(PreLaunchExtension.ID, PreLaunchExtension.class, PreLaunchExtension::onPreLaunch));
 	}
 }

src/main/java/dev/frogmc/frogloader/impl/plugin/mod/JavaModProvider.java

@@ -0,0 +1,26 @@
+package dev.frogmc.frogloader.impl.plugin.mod;
+
+import java.nio.file.Path;
+import java.util.Collection;
+import java.util.Collections;
+
+import dev.frogmc.frogloader.api.mod.ModProperties;
+import dev.frogmc.frogloader.api.plugin.FrogModProvider;
+import dev.frogmc.frogloader.impl.mod.JavaModProperties;
+
+public class JavaModProvider implements FrogModProvider {
+	@Override
+	public String id() {
+		return "frogloader:integrated/java";
+	}
+
+	@Override
+	public boolean isApplicable() {
+		return true;
+	}
+
+	@Override
+	public Collection<ModProperties> loadMods(Collection<Path> modFiles) throws Exception {
+		return Collections.singleton(JavaModProperties.get());
+	}
+}

src/main/resources/META-INF/services/dev.frogmc.frogloader.api.plugin.FrogModProvider

@@ -1 +1,2 @@
+dev.frogmc.frogloader.impl.plugin.mod.JavaModProvider
 dev.frogmc.frogloader.impl.plugin.mod.FrogmodModProvider