Implement jar-in-jar loader system (#2899)

This fixes an issue that prevented LuckPerms from loading on Java 16

velocity/src/main/java/me/lucko/luckperms/velocity/LPVelocityBootstrap.java

@@ -35,8 +35,8 @@ import com.velocitypowered.api.plugin.annotation.DataDirectory;
 import com.velocitypowered.api.proxy.Player;
 import com.velocitypowered.api.proxy.ProxyServer;
 
-import me.lucko.luckperms.common.dependencies.classloader.PluginClassLoader;
 import me.lucko.luckperms.common.plugin.bootstrap.LuckPermsBootstrap;
+import me.lucko.luckperms.common.plugin.classpath.ClassPathAppender;
 import me.lucko.luckperms.common.plugin.logging.PluginLogger;
 import me.lucko.luckperms.common.plugin.logging.Slf4jPluginLogger;
 import me.lucko.luckperms.common.plugin.scheduler.SchedulerAdapter;
@@ -45,7 +45,6 @@ import net.luckperms.api.platform.Platform;
 
 import org.slf4j.Logger;
 
-import java.io.InputStream;
 import java.nio.file.Path;
 import java.time.Instant;
 import java.util.ArrayList;
@@ -79,9 +78,9 @@ public class LPVelocityBootstrap implements LuckPermsBootstrap {
     private final SchedulerAdapter schedulerAdapter;
 
     /**
-     * The plugin classloader
+     * The plugin class path appender
      */
-    private final PluginClassLoader classLoader;
+    private final ClassPathAppender classPathAppender;
 
     /**
      * The plugin instance
@@ -108,7 +107,7 @@ public class LPVelocityBootstrap implements LuckPermsBootstrap {
     public LPVelocityBootstrap(Logger logger) {
         this.logger = new Slf4jPluginLogger(logger);
         this.schedulerAdapter = new VelocitySchedulerAdapter(this);
-        this.classLoader = new VelocityClassLoader(this);
+        this.classPathAppender = new VelocityClassPathAppender(this);
         this.plugin = new LPVelocityPlugin(this);
     }
 
@@ -125,8 +124,8 @@ public class LPVelocityBootstrap implements LuckPermsBootstrap {
     }
 
     @Override
-    public PluginClassLoader getPluginClassLoader() {
-        return this.classLoader;
+    public ClassPathAppender getClassPathAppender() {
+        return this.classPathAppender;
     }
 
     // lifecycle
@@ -202,11 +201,6 @@ public class LPVelocityBootstrap implements LuckPermsBootstrap {
         return this.configDirectory.toAbsolutePath();
     }
 
-    @Override
-    public InputStream getResourceStream(String path) {
-        return getClass().getClassLoader().getResourceAsStream(path);
-    }
-
     @Override
     public Optional<Player> getPlayer(UUID uniqueId) {
         return this.proxy.getPlayer(uniqueId);

velocity/src/main/java/me/lucko/luckperms/velocity/LPVelocityPlugin.java

@@ -41,7 +41,6 @@ import me.lucko.luckperms.common.plugin.util.AbstractConnectionListener;
 import me.lucko.luckperms.common.sender.Sender;
 import me.lucko.luckperms.common.tasks.CacheHousekeepingTask;
 import me.lucko.luckperms.common.tasks.ExpireTemporaryTask;
-import me.lucko.luckperms.common.util.MoreFiles;
 import me.lucko.luckperms.velocity.calculator.VelocityCalculatorFactory;
 import me.lucko.luckperms.velocity.context.VelocityContextManager;
 import me.lucko.luckperms.velocity.context.VelocityPlayerCalculator;
@@ -52,10 +51,6 @@ import me.lucko.luckperms.velocity.messaging.VelocityMessagingFactory;
 import net.luckperms.api.LuckPerms;
 import net.luckperms.api.query.QueryOptions;
 
-import java.io.IOException;
-import java.io.InputStream;
-import java.nio.file.Files;
-import java.nio.file.Path;
 import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
@@ -101,7 +96,7 @@ public class LPVelocityPlugin extends AbstractLuckPermsPlugin {
 
     @Override
     protected ConfigurationAdapter provideConfigurationAdapter() {
-        return new VelocityConfigAdapter(this, resolveConfig());
+        return new VelocityConfigAdapter(this, resolveConfig("config.yml"));
     }
 
     @Override
@@ -169,22 +164,6 @@ public class LPVelocityPlugin extends AbstractLuckPermsPlugin {
 
     }
 
-    private Path resolveConfig() {
-        Path path = this.bootstrap.getConfigDirectory().resolve("config.yml");
-        if (!Files.exists(path)) {
-            try {
-                MoreFiles.createDirectoriesIfNotExists(this.bootstrap.getConfigDirectory());
-                try (InputStream is = getClass().getClassLoader().getResourceAsStream("config.yml")) {
-                    Files.copy(is, path);
-                }
-            } catch (IOException e) {
-                throw new RuntimeException(e);
-            }
-        }
-
-        return path;
-    }
-
     @Override
     public Optional<QueryOptions> getQueryOptionsForUser(User user) {
         return this.bootstrap.getPlayer(user.getUniqueId()).map(player -> this.contextManager.getQueryOptions(player));

velocity/src/main/java/me/lucko/luckperms/velocity/VelocityClassPathAppender.java

@@ -25,14 +25,14 @@
 
 package me.lucko.luckperms.velocity;
 
-import me.lucko.luckperms.common.dependencies.classloader.PluginClassLoader;
+import me.lucko.luckperms.common.plugin.classpath.ClassPathAppender;
 
 import java.nio.file.Path;
 
-public class VelocityClassLoader implements PluginClassLoader {
+public class VelocityClassPathAppender implements ClassPathAppender {
     private final LPVelocityBootstrap bootstrap;
 
-    public VelocityClassLoader(LPVelocityBootstrap bootstrap) {
+    public VelocityClassPathAppender(LPVelocityBootstrap bootstrap) {
         this.bootstrap = bootstrap;
     }