diff --git a/bukkit/pom.xml b/bukkit/pom.xml
index b27a3b5..e1d72ef 100644
--- a/bukkit/pom.xml
+++ b/bukkit/pom.xml
@@ -30,6 +30,14 @@
             <version>${project.version}</version>
             <scope>compile</scope>
             <exclusions>
+                <exclusion>
+                    <groupId>org.xerial</groupId>
+                    <artifactId>sqlite-jdbc</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>com.mysql</groupId>
+                    <artifactId>mysql-connector-j</artifactId>
+                </exclusion>
                 <exclusion>
                     <groupId>com.googlecode.json-simple</groupId>
                     <artifactId>json-simple</artifactId>
@@ -51,7 +59,7 @@
         <dependency>
             <groupId>com.mojang</groupId>
             <artifactId>authlib</artifactId>
-            <version>6.0.58</version>
+            <version>6.0.54</version>
             <scope>provided</scope>
         </dependency>
     </dependencies>
diff --git a/bukkit/src/main/java/org/zhdev/BukkitPreparedPlugin.java b/bukkit/src/main/java/org/zhdev/BukkitPreparedPlugin.java
index 109fd6f..daf8da1 100644
--- a/bukkit/src/main/java/org/zhdev/BukkitPreparedPlugin.java
+++ b/bukkit/src/main/java/org/zhdev/BukkitPreparedPlugin.java
@@ -25,6 +25,9 @@ import java.io.File;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.logging.Level;
 
 public abstract class BukkitPreparedPlugin extends BukkitPlugin implements Listener, PreparedPlugin {
     protected final Path dataDirectory;
@@ -32,6 +35,8 @@ public abstract class BukkitPreparedPlugin extends BukkitPlugin implements Liste
     protected final Language language = new Language();
     protected final SqlAdapter sqlAdapter = createSqlAdapter();
 
+    private ExecutorService singleThreadExecutor;
+
     public BukkitPreparedPlugin() {
         super();
         dataDirectory = getDataFolder().toPath();
@@ -173,6 +178,10 @@ public abstract class BukkitPreparedPlugin extends BukkitPlugin implements Liste
         closeSqlAdapter();
         defaultConfig.clear();
 
+        if (singleThreadExecutor != null) {
+            singleThreadExecutor.shutdownNow();
+        }
+
         BukkitUtils.unregisterCommandIf(command -> command instanceof PluginIdentifiableCommand && ((PluginIdentifiableCommand) command).getPlugin() == this);
     }
 
@@ -186,4 +195,18 @@ public abstract class BukkitPreparedPlugin extends BukkitPlugin implements Liste
             disable();
         }
     }
+
+    public void runTaskSeparately(Runnable runnable) {
+        if (singleThreadExecutor == null) {
+            singleThreadExecutor = Executors.newSingleThreadExecutor();
+        }
+
+        singleThreadExecutor.execute(() -> {
+            try {
+                runnable.run();
+            } catch (Throwable throwable) {
+                getLogger().log(Level.SEVERE, "Unhandled exception while running separated task", throwable);
+            }
+        });
+    }
 }
diff --git a/bukkit/src/main/java/org/zhdev/util/BukkitReflectionUtils.java b/bukkit/src/main/java/org/zhdev/util/BukkitReflectionUtils.java
index b50cb74..ccd093b 100644
--- a/bukkit/src/main/java/org/zhdev/util/BukkitReflectionUtils.java
+++ b/bukkit/src/main/java/org/zhdev/util/BukkitReflectionUtils.java
@@ -54,12 +54,7 @@ class BukkitReflectionUtils {
     private static class ModernGameProfileConsumer implements GameProfileConsumer {
         private final Class<?> __ResolvableProfile_CLASS = ReflectionUtils.getType("net.minecraft.world.item.component.ResolvableProfile");
         private final Constructor<?> __ResolvableProfile_CONSTRUCTOR;
-        protected final Method __setProfile__CraftMetaSkull__METHOD = ReflectionUtils.methodSearcher()
-                .type(__CraftMetaSkull__CLASS)
-                .methodOf("setProfile")
-                .parameters(__ResolvableProfile_CLASS)
-                .returns(void.class)
-                .search();
+        protected final Method __setProfile__CraftMetaSkull__METHOD = ReflectionUtils.getMethod(__ResolvableProfile_CLASS, "setProfile", __ResolvableProfile_CLASS);
 
         ModernGameProfileConsumer() {
             Constructor<?> resolvableConstructor;
diff --git a/common/src/main/java/org/zhdev/util/ReflectionUtils.java b/common/src/main/java/org/zhdev/util/ReflectionUtils.java
index 900761e..dd71599 100644
--- a/common/src/main/java/org/zhdev/util/ReflectionUtils.java
+++ b/common/src/main/java/org/zhdev/util/ReflectionUtils.java
@@ -5,9 +5,7 @@ import org.zhdev.reflection.MethodSearcher;
 
 import java.io.File;
 import java.io.IOException;
-import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
-import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.Enumeration;
 import java.util.function.Consumer;
@@ -27,12 +25,6 @@ public class ReflectionUtils {
         return field;
     }
 
-    private static Constructor<?> getConstructor0(Class<?> type, Class<?>... parameterTypes) throws NoSuchMethodException {
-        Constructor<?> constructor = type.getDeclaredConstructor(parameterTypes);
-        constructor.setAccessible(true);
-        return constructor;
-    }
-
     private static boolean compareParameters(Class<?>[] required, Class<?>... parameters) {
         if (required.length != parameters.length) {
             return false;
@@ -182,22 +174,6 @@ public class ReflectionUtils {
         }
     }
 
-    public static Constructor<?> getConstructor(Class<?> type, Class<?>... parameterTypes) throws NoSuchMethodError {
-        try {
-            return getConstructor0(type, parameterTypes);
-        } catch (NoSuchMethodException e) {
-            throw new NoSuchMethodError(e.getMessage());
-        }
-    }
-
-    public static Object newInstance(Constructor<?> constructor, Object... args) throws NoSuchMethodError {
-        try {
-            return constructor.newInstance(args);
-        } catch (ReflectiveOperationException e) {
-            throw new IllegalStateException(e);
-        }
-    }
-
     public static void forEachClass(ClassLoader loader, JarFile jarFile, String packageName, Consumer<Class<?>> consumer) {
         for (Enumeration<JarEntry> entry = jarFile.entries(); entry.hasMoreElements(); ) {
             JarEntry jarEntry = entry.nextElement();
diff --git a/db/pom.xml b/db/pom.xml
index d594c22..1b61707 100644
--- a/db/pom.xml
+++ b/db/pom.xml
@@ -23,19 +23,19 @@
             <groupId>org.xerial</groupId>
             <artifactId>sqlite-jdbc</artifactId>
             <version>3.42.0.0</version>
-            <scope>provided</scope>
+            <scope>compile</scope>
         </dependency>
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
             <version>2.2.220</version>
-            <scope>provided</scope>
+            <scope>compile</scope>
         </dependency>
         <dependency>
             <groupId>com.mysql</groupId>
             <artifactId>mysql-connector-j</artifactId>
-            <version>9.2.0</version>
-            <scope>provided</scope>
+            <version>8.2.0</version>
+            <scope>compile</scope>
         </dependency>
     </dependencies>
 </project>
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 73089a6..2c4bb9d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -52,6 +52,32 @@
                     <target>8</target>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>3.5.3</version>
+                <configuration>
+                    <filters>
+                        <filter>
+                            <artifact>*:*</artifact>
+                            <excludes>
+                                <exclude>META-INF/**</exclude>
+                            </excludes>
+                        </filter>
+                    </filters>
+                    <shadedArtifactAttached>true</shadedArtifactAttached>
+                    <createDependencyReducedPom>false</createDependencyReducedPom>
+                    <minimizeJar>true</minimizeJar>
+                </configuration>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-jar-plugin</artifactId>
diff --git a/velocity/pom.xml b/velocity/pom.xml
index e246a2d..32aa20e 100644
--- a/velocity/pom.xml
+++ b/velocity/pom.xml
@@ -29,7 +29,7 @@
         <dependency>
             <groupId>com.velocitypowered</groupId>
             <artifactId>velocity-api</artifactId>
-            <version>3.4.0-SNAPSHOT</version>
+            <version>3.1.2-SNAPSHOT</version>
             <scope>provided</scope>
         </dependency>
         <dependency>