diff --git a/edxp-common/src/main/java/com/elderdrivers/riru/edxp/core/Main.java b/edxp-common/src/main/java/com/elderdrivers/riru/edxp/core/Main.java
index 31bdc641..bb5c0c35 100644
--- a/edxp-common/src/main/java/com/elderdrivers/riru/edxp/core/Main.java
+++ b/edxp-common/src/main/java/com/elderdrivers/riru/edxp/core/Main.java
@@ -123,6 +123,11 @@ public class Main implements KeepAll {
         return edxpImplRef.get();
     }
 
+    @EdxpImpl.Variant
+    public static synchronized int getEdxpVariant() {
+        return getEdxpImpl().getVariant();
+    }
+
     private static void loadEdxpImpls() {
         AccessController.doPrivileged(new PrivilegedAction<Void>() {
             public Void run() {
@@ -133,7 +138,7 @@ public class Main implements KeepAll {
                         iterator.next();
                     }
                 } catch (Throwable t) {
-                    // Do nothing
+                    Utils.logE("error when loadEdxpImpls", t);
                 }
                 return null;
             }
diff --git a/edxp-core/build.gradle b/edxp-core/build.gradle
index f2adc708..8818ada5 100644
--- a/edxp-core/build.gradle
+++ b/edxp-core/build.gradle
@@ -3,10 +3,10 @@ import org.gradle.internal.os.OperatingSystem
 
 apply plugin: 'com.android.library'
 
-version "v0.4.4.0_alpha"
+version "v0.4.4.1_alpha"
 
 ext {
-    versionCode = "4400"
+    versionCode = "4410"
     module_name = "EdXposed"
     jar_dest_dir = "${projectDir}/template_override/system/framework/"
     is_windows = OperatingSystem.current().isWindows()
diff --git a/edxp-core/src/main/cpp/main/include/JNIHelper.h b/edxp-core/src/main/cpp/main/include/JNIHelper.h
index a28708a0..d3dab8a2 100644
--- a/edxp-core/src/main/cpp/main/include/JNIHelper.h
+++ b/edxp-core/src/main/cpp/main/include/JNIHelper.h
@@ -85,7 +85,11 @@ ALWAYS_INLINE static int ClearException(JNIEnv *env) {
 
 #define JNI_CallStaticObjectMethod(env, obj, ...) \
     env->CallStaticObjectMethod(obj, __VA_ARGS__); \
-    if (ClearException(env)) LOGE("CallStaticVoidMethod " #obj " " #__VA_ARGS__);
+    if (ClearException(env)) LOGE("CallStaticObjectMethod " #obj " " #__VA_ARGS__);
+
+#define JNI_CallStaticIntMethod(env, obj, ...) \
+    env->CallStaticIntMethod(obj, __VA_ARGS__); \
+    if (ClearException(env)) LOGE("CallStaticIntMethod " #obj " " #__VA_ARGS__);
 
 #define JNI_GetArrayLength(env, array) \
     env->GetArrayLength(array); \
diff --git a/edxp-core/src/main/cpp/main/include/art/runtime/jni_env_ext.h b/edxp-core/src/main/cpp/main/include/art/runtime/jni_env_ext.h
index 1f34f6cf..015122dd 100644
--- a/edxp-core/src/main/cpp/main/include/art/runtime/jni_env_ext.h
+++ b/edxp-core/src/main/cpp/main/include/art/runtime/jni_env_ext.h
@@ -13,16 +13,25 @@ namespace art {
             return NewLocalRefSym(env, mirror_ptr);
         }
 
+        CREATE_FUNC_SYMBOL_ENTRY(void, DeleteLocalRef, void *env, jobject obj) {
+            DeleteLocalRefSym(env, obj);
+        }
+
     public:
         JNIEnvExt(void *thiz) : HookedObject(thiz) {}
 
         static void Setup(void *handle, HookFunType hook_func) {
             RETRIEVE_FUNC_SYMBOL(NewLocalRef, "_ZN3art9JNIEnvExt11NewLocalRefEPNS_6mirror6ObjectE");
+            RETRIEVE_FUNC_SYMBOL(DeleteLocalRef, "_ZN3art9JNIEnvExt14DeleteLocalRefEP8_jobject");
         }
 
         jobject NewLocalRefer(void *mirror_ptr) {
             return NewLocalRef(thiz_, mirror_ptr);
         }
+
+        void DeleteLocalRef(jobject obj) {
+            DeleteLocalRef(thiz_, obj);
+        }
     };
 
 
diff --git a/edxp-core/src/main/cpp/main/src/edxp_context.cpp b/edxp-core/src/main/cpp/main/src/edxp_context.cpp
index de15cf73..831d8d8c 100644
--- a/edxp-core/src/main/cpp/main/src/edxp_context.cpp
+++ b/edxp-core/src/main/cpp/main/src/edxp_context.cpp
@@ -33,13 +33,14 @@ namespace edxp {
     }
 
     void Context::CallOnPostFixupStaticTrampolines(void *class_ptr) {
-        if (post_fixup_static_mid_ != nullptr) {
-            JNIEnv *env;
-            vm_->GetEnv((void **) (&env), JNI_VERSION_1_4);
-            art::JNIEnvExt env_ext(env);
-            jobject clazz = env_ext.NewLocalRefer(class_ptr);
-            JNI_CallStaticVoidMethod(env, class_linker_class_, post_fixup_static_mid_, clazz);
+        if (UNLIKELY(!post_fixup_static_mid_ || !class_linker_class_)) {
+            return;
         }
+        JNIEnv *env;
+        vm_->GetEnv((void **) (&env), JNI_VERSION_1_4);
+        art::JNIEnvExt env_ext(env);
+        ScopedLocalRef clazz(env, env_ext.NewLocalRefer(class_ptr));
+        JNI_CallStaticVoidMethod(env, class_linker_class_, post_fixup_static_mid_, clazz.get());
     }
 
     void Context::LoadDexAndInit(JNIEnv *env, const char *dex_path) {
@@ -60,12 +61,22 @@ namespace edxp {
                                             "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/ClassLoader;)V");
         jobject my_cl = JNI_NewObject(env, path_classloader, initMid, env->NewStringUTF(dex_path),
                                       nullptr, sys_classloader);
-        if (UNLIKELY(!my_cl)) {
+
+        env->DeleteLocalRef(classloader);
+        env->DeleteLocalRef(sys_classloader);
+        env->DeleteLocalRef(path_classloader);
+
+        if (UNLIKELY(my_cl == nullptr)) {
             LOG(ERROR) << "PathClassLoader creation failed!!!";
             return;
         }
+
+        // TODO clear up all these global refs if blacklisted?
+
         inject_class_loader_ = env->NewGlobalRef(my_cl);
 
+        env->DeleteLocalRef(my_cl);
+
         // initialize pending methods related
         env->GetJavaVM(&vm_);
         class_linker_class_ = (jclass) env->NewGlobalRef(
@@ -84,22 +95,36 @@ namespace edxp {
         RegisterArtHeap(env);
         RegisterEdxpYahfa(env);
 
+        // must call entry class's methods after all native methods registered
+        if (LIKELY(entry_class_)) {
+            jmethodID get_variant_mid = JNI_GetStaticMethodID(env, entry_class_,
+                                                              "getEdxpVariant", "()I");
+            if (LIKELY(get_variant_mid)) {
+                int variant = JNI_CallStaticIntMethod(env, entry_class_, get_variant_mid);
+                variant_ = static_cast<Variant>(variant);
+            }
+        }
+
         initialized_ = true;
 
-        //for SandHook variant
-        ScopedDlHandle sandhook_handle(kLibSandHookPath.c_str());
-        if (!sandhook_handle.IsValid()) {
-            return;
-        }
-        typedef bool *(*TYPE_JNI_LOAD)(JNIEnv *, jclass, jclass);
-        auto jni_load = sandhook_handle.DlSym<TYPE_JNI_LOAD>("JNI_Load_Ex");
-        jclass sandhook_class = FindClassFromLoader(env, kSandHookClassName);
-        jclass nevercall_class = FindClassFromLoader(env, kSandHookNeverCallClassName);
-        if (!sandhook_class || !nevercall_class) { // fail-fast
-            return;
-        }
-        if (!jni_load(env, sandhook_class, nevercall_class)) {
-            LOGE("SandHook: HookEntry class error. %d", getpid());
+        if (variant_ == SANDHOOK) {
+            //for SandHook variant
+            ScopedDlHandle sandhook_handle(kLibSandHookPath.c_str());
+            if (!sandhook_handle.IsValid()) {
+                return;
+            }
+            typedef bool *(*TYPE_JNI_LOAD)(JNIEnv *, jclass, jclass);
+            auto jni_load = sandhook_handle.DlSym<TYPE_JNI_LOAD>("JNI_Load_Ex");
+            ScopedLocalRef sandhook_class(env, FindClassFromLoader(env, kSandHookClassName));
+            ScopedLocalRef nevercall_class(env,
+                                           FindClassFromLoader(env, kSandHookNeverCallClassName));
+            if (sandhook_class == nullptr || nevercall_class == nullptr) { // fail-fast
+                return;
+            }
+            if (!jni_load(env, sandhook_class.get(), nevercall_class.get())) {
+                LOGE("SandHook: HookEntry class error. %d", getpid());
+            }
+
         }
     }
 
@@ -136,7 +161,7 @@ namespace edxp {
 
     inline void Context::FindAndCall(JNIEnv *env, const char *method_name,
                                      const char *method_sig, ...) const {
-        if (!entry_class_) {
+        if (UNLIKELY(!entry_class_)) {
             LOGE("cannot call method %s, entry class is null", method_name);
             return;
         }
@@ -235,8 +260,7 @@ namespace edxp {
         if (res == 0) {
             PrepareJavaEnv(env);
             FindAndCall(env, "forkAndSpecializePost", "(ILjava/lang/String;Ljava/lang/String;)V",
-                        res,
-                        app_data_dir_, nice_name_);
+                        res, app_data_dir_, nice_name_);
         } else {
             // in zygote process, res is child zygote pid
             // don't print log here, see https://github.com/RikkaApps/Riru/blob/77adfd6a4a6a81bfd20569c910bc4854f2f84f5e/riru-core/jni/main/jni_native_method.cpp#L55-L66
diff --git a/edxp-core/src/main/cpp/main/src/edxp_context.h b/edxp-core/src/main/cpp/main/src/edxp_context.h
index 45369f21..135a6b93 100644
--- a/edxp-core/src/main/cpp/main/src/edxp_context.h
+++ b/edxp-core/src/main/cpp/main/src/edxp_context.h
@@ -8,6 +8,13 @@ namespace edxp {
 
 #define SYSTEM_SERVER_DATA_DIR "/data/user/0/android"
 
+    enum Variant {
+        NONE = 0,
+        YAHFA = 1,
+        SANDHOOK = 2,
+        WHALE = 3
+    };
+
     class Context {
 
     public:
@@ -52,6 +59,7 @@ namespace edxp {
     private:
         static Context *instance_;
         bool initialized_ = false;
+        Variant variant_ = NONE;
         jobject inject_class_loader_ = nullptr;
         jclass entry_class_ = nullptr;
         jstring app_data_dir_ = nullptr;
diff --git a/edxp-core/src/main/cpp/main/src/native_hook.cpp b/edxp-core/src/main/cpp/main/src/native_hook.cpp
index 4bcf72fc..2115af77 100644
--- a/edxp-core/src/main/cpp/main/src/native_hook.cpp
+++ b/edxp-core/src/main/cpp/main/src/native_hook.cpp
@@ -62,13 +62,12 @@ namespace edxp {
         hook_func = reinterpret_cast<HookFunType>(hook_func_symbol);
 
         if (api_level >= ANDROID_P) {
-            void *handle = DlOpen(kLibDlPath.c_str());
+            ScopedDlHandle dl_handle(kLibDlPath.c_str());
+            void *handle = dl_handle.Get();
             HOOK_FUNC(mydlopen, "__loader_dlopen");
-            dlclose(handle);
         } else {
-            void *art_handle = DlOpen(kLibArtPath.c_str());
-            InstallArtHooks(art_handle);
-            dlclose(art_handle);
+            ScopedDlHandle art_handle(kLibArtPath.c_str());
+            InstallArtHooks(art_handle.Get());
         }
     }
 
diff --git a/edxp-core/template_override/common/util_functions.sh b/edxp-core/template_override/common/util_functions.sh
index 6ed34e9c..f6795fd5 100644
--- a/edxp-core/template_override/common/util_functions.sh
+++ b/edxp-core/template_override/common/util_functions.sh
@@ -1,6 +1,6 @@
 #!/system/bin/sh
 
-EDXP_VERSION="0.4.4.0_alpha (4400)"
+EDXP_VERSION="0.4.4.1_alpha (4410)"
 ANDROID_SDK=`getprop ro.build.version.sdk`
 BUILD_DESC=`getprop ro.build.description`
 PRODUCT=`getprop ro.build.product`