diff --git a/core/src/main/java/io/github/libxposed/XposedContextWrapper.java b/core/src/main/java/io/github/libxposed/XposedContextWrapper.java
index 59bc0b0c..09849165 100644
--- a/core/src/main/java/io/github/libxposed/XposedContextWrapper.java
+++ b/core/src/main/java/io/github/libxposed/XposedContextWrapper.java
@@ -85,6 +85,12 @@ public class XposedContextWrapper extends ContextWrapper implements XposedInterf
         return getBaseContext().deoptimize(constructor);
     }
 
+    @Nullable
+    @Override
+    public XposedUtils getUtils() {
+        return getBaseContext().getUtils();
+    }
+
     @Override
     final public void log(@NonNull String message) {
         getBaseContext().log(message);
diff --git a/core/src/main/java/io/github/libxposed/XposedInterface.java b/core/src/main/java/io/github/libxposed/XposedInterface.java
index 2dae95d5..65f1bdc3 100644
--- a/core/src/main/java/io/github/libxposed/XposedInterface.java
+++ b/core/src/main/java/io/github/libxposed/XposedInterface.java
@@ -5,6 +5,7 @@ import androidx.annotation.Nullable;
 
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;
+import java.util.ConcurrentModificationException;
 
 public interface XposedInterface {
     interface BeforeHookCallback<T> {
@@ -24,7 +25,7 @@ public interface XposedInterface {
         @Nullable
         Object invokeOrigin(@Nullable Object thisObject, Object[] args);
 
-        <U> void setExtra(String key, @Nullable U value);
+        <U> void setExtra(@NonNull String key, @Nullable U value) throws ConcurrentModificationException;
     }
 
     interface AfterHookCallback<T> {
@@ -53,7 +54,7 @@ public interface XposedInterface {
         Object invokeOrigin(@Nullable Object thisObject, Object[] args);
 
         @Nullable
-        <U> U getExtra(String key);
+        <U> U getExtra(@NonNull String key);
     }
 
     interface PriorityMethodHooker {
@@ -109,6 +110,8 @@ public interface XposedInterface {
 
     <T> boolean deoptimize(@Nullable Constructor<T> constructor);
 
+    @Nullable XposedUtils getUtils();
+
     void log(@NonNull String message);
 
     void log(@NonNull String message, @NonNull Throwable throwable);
diff --git a/core/src/main/java/io/github/libxposed/XposedUtils.java b/core/src/main/java/io/github/libxposed/XposedUtils.java
new file mode 100644
index 00000000..b5e6a9ab
--- /dev/null
+++ b/core/src/main/java/io/github/libxposed/XposedUtils.java
@@ -0,0 +1,18 @@
+package io.github.libxposed;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+public interface XposedUtils {
+    @NonNull
+    <T> Class<T> classByName(@NonNull String className, @Nullable ClassLoader classLoader) throws ClassNotFoundException;
+
+    @Nullable
+    <T> Class<T> classOrNullByName(@NonNull String className, @Nullable ClassLoader classLoader);
+
+    @NonNull
+    <T> Class<T> classByBinaryName(@NonNull String binaryClassName, @Nullable ClassLoader classLoader) throws ClassNotFoundException;
+
+    @Nullable
+    <T> Class<T> classOrNullByBinaryName(@NonNull String binaryClassName, @Nullable ClassLoader classLoader);
+}
diff --git a/core/src/main/java/org/lsposed/lspd/impl/LSPosedContext.java b/core/src/main/java/org/lsposed/lspd/impl/LSPosedContext.java
index 85d6282f..9f4d371f 100644
--- a/core/src/main/java/org/lsposed/lspd/impl/LSPosedContext.java
+++ b/core/src/main/java/org/lsposed/lspd/impl/LSPosedContext.java
@@ -53,6 +53,7 @@ import de.robv.android.xposed.XposedInit;
 import io.github.libxposed.XposedContext;
 import io.github.libxposed.XposedModule;
 import io.github.libxposed.XposedModuleInterface;
+import io.github.libxposed.XposedUtils;
 
 public class LSPosedContext extends XposedContext {
 
@@ -787,13 +788,20 @@ public class LSPosedContext extends XposedContext {
         return false;
     }
 
+    // TODO
+    @Nullable
     @Override
-    public void log(@NonNull String message) {
+    public XposedUtils getUtils() {
+        return null;
+    }
+
+    @Override
+    public synchronized void log(@NonNull String message) {
         Log.i(TAG, mPackageName + ": " + message);
     }
 
     @Override
-    public void log(@NonNull String message, @NonNull Throwable throwable) {
+    public synchronized void log(@NonNull String message, @NonNull Throwable throwable) {
         Log.e(TAG, mPackageName + ": " + message, throwable);
     }
 }