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Fix JNI local reference table overflow when wrapping Java class with large method counts

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This commit is contained in:
Fredia Huya-Kouadio 2025-08-16 22:09:20 -07:00
parent 0622cee189
commit 35fda7f857
5 changed files with 77 additions and 120 deletions
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68
platform/android/java_class_wrapper.cpp
View file

@ -43,6 +43,8 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
JNIEnv *env = get_jni_env();
ERR_FAIL_NULL_V(env, false);
env->PushLocalFrame(p_argcount);
MethodInfo *method = nullptr;
for (MethodInfo &E : M->value) {
if (!p_instance && !E._static && !E._constructor) {
@ -284,7 +286,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
argv = (jvalue *)alloca(sizeof(jvalue) * method->param_types.size());
}
List<jobject> to_free;
for (int i = 0; i < method->param_types.size(); i++) {
switch (method->param_types[i]) {
case ARG_TYPE_VOID: {
@ -323,7 +324,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
val.z = (bool)(*p_args[i]);
jobject obj = env->NewObjectA(bclass, ctor, &val);
argv[i].l = obj;
to_free.push_back(obj);
} break;
case ARG_NUMBER_CLASS_BIT | ARG_TYPE_BYTE: {
jclass bclass = jni_find_class(env, "java/lang/Byte");
@ -332,7 +332,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
val.b = (int)(*p_args[i]);
jobject obj = env->NewObjectA(bclass, ctor, &val);
argv[i].l = obj;
to_free.push_back(obj);
} break;
case ARG_NUMBER_CLASS_BIT | ARG_TYPE_CHAR: {
jclass bclass = jni_find_class(env, "java/lang/Character");
@ -341,7 +340,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
val.c = (int)(*p_args[i]);
jobject obj = env->NewObjectA(bclass, ctor, &val);
argv[i].l = obj;
to_free.push_back(obj);
} break;
case ARG_NUMBER_CLASS_BIT | ARG_TYPE_SHORT: {
jclass bclass = jni_find_class(env, "java/lang/Short");
@ -350,7 +348,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
val.s = (int)(*p_args[i]);
jobject obj = env->NewObjectA(bclass, ctor, &val);
argv[i].l = obj;
to_free.push_back(obj);
} break;
case ARG_NUMBER_CLASS_BIT | ARG_TYPE_INT: {
jclass bclass = jni_find_class(env, "java/lang/Integer");
@ -359,7 +356,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
val.i = (int)(*p_args[i]);
jobject obj = env->NewObjectA(bclass, ctor, &val);
argv[i].l = obj;
to_free.push_back(obj);
} break;
case ARG_NUMBER_CLASS_BIT | ARG_TYPE_LONG: {
jclass bclass = jni_find_class(env, "java/lang/Long");
@ -368,7 +364,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
val.j = (int64_t)(*p_args[i]);
jobject obj = env->NewObjectA(bclass, ctor, &val);
argv[i].l = obj;
to_free.push_back(obj);
} break;
case ARG_NUMBER_CLASS_BIT | ARG_TYPE_FLOAT: {
jclass bclass = jni_find_class(env, "java/lang/Float");
@ -377,7 +372,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
val.f = (float)(*p_args[i]);
jobject obj = env->NewObjectA(bclass, ctor, &val);
argv[i].l = obj;
to_free.push_back(obj);
} break;
case ARG_NUMBER_CLASS_BIT | ARG_TYPE_DOUBLE: {
jclass bclass = jni_find_class(env, "java/lang/Double");
@ -386,23 +380,20 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
val.d = (double)(*p_args[i]);
jobject obj = env->NewObjectA(bclass, ctor, &val);
argv[i].l = obj;
to_free.push_back(obj);
} break;
case ARG_TYPE_STRING:
case ARG_TYPE_CHARSEQUENCE: {
String s = *p_args[i];
jstring jStr = env->NewStringUTF(s.utf8().get_data());
argv[i].l = jStr;
to_free.push_back(jStr);
} break;
case ARG_TYPE_CALLABLE: {
jobject jcallable = callable_to_jcallable(env, *p_args[i]);
argv[i].l = jcallable;
to_free.push_back(jcallable);
} break;
case ARG_TYPE_CLASS: {
if (p_args[i]->get_type() == Variant::DICTIONARY) {
argv[i].l = _variant_to_jvalue(env, Variant::DICTIONARY, p_args[i]).obj;
argv[i].l = _variant_to_jvalue(env, Variant::DICTIONARY, p_args[i]).l;
} else {
Ref<JavaObject> jo = *p_args[i];
if (jo.is_valid()) {
@ -420,8 +411,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
env->SetBooleanArrayRegion(a, j, 1, &val);
}
argv[i].l = a;
to_free.push_back(a);
} break;
case ARG_ARRAY_BIT | ARG_TYPE_BYTE: {
jbyteArray a = nullptr;
@ -440,8 +429,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
}
argv[i].l = a;
to_free.push_back(a);
} break;
case ARG_ARRAY_BIT | ARG_TYPE_CHAR: {
jcharArray a = nullptr;
@ -462,7 +449,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
}
argv[i].l = a;
to_free.push_back(a);
} break;
case ARG_ARRAY_BIT | ARG_TYPE_SHORT: {
@ -485,7 +471,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
}
argv[i].l = a;
to_free.push_back(a);
} break;
case ARG_ARRAY_BIT | ARG_TYPE_INT: {
@ -505,7 +490,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
}
argv[i].l = a;
to_free.push_back(a);
} break;
case ARG_ARRAY_BIT | ARG_TYPE_LONG: {
jlongArray a = nullptr;
@ -524,8 +508,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
}
argv[i].l = a;
to_free.push_back(a);
} break;
case ARG_ARRAY_BIT | ARG_TYPE_FLOAT: {
jfloatArray a = nullptr;
@ -544,8 +526,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
}
argv[i].l = a;
to_free.push_back(a);
} break;
case ARG_ARRAY_BIT | ARG_TYPE_DOUBLE: {
jdoubleArray a = nullptr;
@ -564,8 +544,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
}
argv[i].l = a;
to_free.push_back(a);
} break;
case ARG_ARRAY_BIT | ARG_TYPE_STRING:
case ARG_ARRAY_BIT | ARG_TYPE_CHARSEQUENCE: {
@ -578,7 +556,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
String s = arr[j];
jstring jStr = env->NewStringUTF(s.utf8().get_data());
env->SetObjectArrayElement(a, j, jStr);
to_free.push_back(jStr);
}
} else if (p_args[i]->get_type() == Variant::PACKED_STRING_ARRAY) {
PackedStringArray arr = *p_args[i];
@ -587,12 +564,10 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
String s = arr[j];
jstring jStr = env->NewStringUTF(s.utf8().get_data());
env->SetObjectArrayElement(a, j, jStr);
to_free.push_back(jStr);
}
}
argv[i].l = a;
to_free.push_back(a);
} break;
case ARG_ARRAY_BIT | ARG_TYPE_CALLABLE: {
Array arr = *p_args[i];
@ -601,11 +576,9 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
Variant callable = arr[j];
jobject jcallable = callable_to_jcallable(env, callable);
env->SetObjectArrayElement(jarr, j, jcallable);
to_free.push_back(jcallable);
}
argv[i].l = jarr;
to_free.push_back(jarr);
} break;
case ARG_ARRAY_BIT | ARG_TYPE_CLASS: {
String cn = method->param_sigs[i].operator String();
@ -622,7 +595,6 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
}
argv[i].l = jarr;
to_free.push_back(jarr);
}
} break;
}
@ -720,30 +692,25 @@ bool JavaClass::_call_method(JavaObject *p_instance, const StringName &p_method,
r_error.error = Callable::CallError::CALL_ERROR_INVALID_METHOD;
success = false;
}
env->DeleteLocalRef(obj);
}
} break;
}
for (jobject &E : to_free) {
env->DeleteLocalRef(E);
}
jobject exception = env->ExceptionOccurred();
if (exception) {
env->ExceptionClear();
jclass java_class = env->GetObjectClass(exception);
Ref<JavaClass> java_class_wrapped = JavaClassWrapper::singleton->wrap_jclass(java_class);
env->DeleteLocalRef(java_class);
JavaClassWrapper::singleton->exception.instantiate(java_class_wrapped, exception);
env->DeleteLocalRef(exception);
} else {
JavaClassWrapper::singleton->exception.unref();
}
env->PopLocalFrame(nullptr);
return success;
}
@ -1522,22 +1489,16 @@ Ref<JavaClass> JavaClassWrapper::_wrap(const String &p_class, bool p_allow_non_p
java_class->_class = (jclass)env->NewGlobalRef(bclass);
class_cache[class_name_dots] = java_class;
LocalVector<jobject> methods_and_constructors;
int constructor_count = env->GetArrayLength(constructors);
int method_count = env->GetArrayLength(methods);
methods_and_constructors.resize(method_count + constructor_count);
for (int i = 0; i < constructor_count; i++) {
methods_and_constructors[i] = env->GetObjectArrayElement(constructors, i);
}
for (int i = 0; i < method_count; i++) {
methods_and_constructors[constructor_count + i] = env->GetObjectArrayElement(methods, i);
}
for (int i = 0; i < (int)methods_and_constructors.size(); i++) {
jobject obj = methods_and_constructors[i];
ERR_CONTINUE(!obj);
int methods_and_constructors_count = method_count + constructor_count;
for (int i = 0; i < methods_and_constructors_count; i++) {
bool is_constructor = i < constructor_count;
jobject obj = is_constructor
? env->GetObjectArrayElement(constructors, i)
: env->GetObjectArrayElement(methods, i - constructor_count);
ERR_CONTINUE(!obj);
String str_method;
if (is_constructor) {
@ -1671,9 +1632,9 @@ Ref<JavaClass> JavaClassWrapper::_wrap(const String &p_class, bool p_allow_non_p
continue;
}
ERR_CONTINUE(!mi.method);
java_class->methods[str_method].push_back(mi);
if (mi.method) {
java_class->methods[str_method].push_back(mi);
}
}
env->DeleteLocalRef(obj);
@ -1720,6 +1681,7 @@ Ref<JavaClass> JavaClassWrapper::_wrap(const String &p_class, bool p_allow_non_p
}
env->DeleteLocalRef(fields);
env->DeleteLocalRef(bclass);
return java_class;
}

4
platform/android/java_godot_lib_jni.cpp
View file

@ -514,7 +514,7 @@ JNIEXPORT void JNICALL Java_org_godotengine_godot_GodotLib_setEditorSetting(JNIE
}
JNIEXPORT jobject JNICALL Java_org_godotengine_godot_GodotLib_getEditorProjectMetadata(JNIEnv *env, jclass clazz, jstring p_section, jstring p_key, jobject p_default_value) {
jvalret result;
jvalue result;
#ifdef TOOLS_ENABLED
if (EditorSettings::get_singleton() != nullptr) {
@ -528,7 +528,7 @@ JNIEXPORT jobject JNICALL Java_org_godotengine_godot_GodotLib_getEditorProjectMe
WARN_PRINT("Access to the Editor Settings Project Metadata is only available on Editor builds");
#endif
return result.obj;
return result.l;
}
JNIEXPORT void JNICALL Java_org_godotengine_godot_GodotLib_setEditorProjectMetadata(JNIEnv *env, jclass clazz, jstring p_section, jstring p_key, jobject p_data) {

109
platform/android/jni_utils.cpp
View file

@ -86,15 +86,16 @@ String charsequence_to_string(JNIEnv *p_env, jobject p_charsequence) {
return result;
}
jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_arg, bool force_jobject, int p_depth) {
jvalret v;
jvalue _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_arg, bool force_jobject, int p_depth) {
jvalue value;
if (p_depth > Variant::MAX_RECURSION_DEPTH) {
ERR_PRINT("Variant is too deep! Bailing.");
v.val.i = 0;
return v;
value.i = 0;
return value;
}
env->PushLocalFrame(2);
switch (p_type) {
case Variant::BOOL: {
if (force_jobject) {
@ -103,11 +104,10 @@ jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_a
jvalue val;
val.z = (bool)(*p_arg);
jobject obj = env->NewObjectA(bclass, ctor, &val);
v.val.l = obj;
v.obj = obj;
value.l = obj;
env->DeleteLocalRef(bclass);
} else {
v.val.z = *p_arg;
value.z = *p_arg;
}
} break;
case Variant::INT: {
@ -117,12 +117,11 @@ jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_a
jvalue val;
val.i = (int)(*p_arg);
jobject obj = env->NewObjectA(bclass, ctor, &val);
v.val.l = obj;
v.obj = obj;
value.l = obj;
env->DeleteLocalRef(bclass);
} else {
v.val.i = *p_arg;
value.i = *p_arg;
}
} break;
case Variant::FLOAT: {
@ -132,19 +131,17 @@ jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_a
jvalue val;
val.d = (double)(*p_arg);
jobject obj = env->NewObjectA(bclass, ctor, &val);
v.val.l = obj;
v.obj = obj;
value.l = obj;
env->DeleteLocalRef(bclass);
} else {
v.val.f = *p_arg;
value.f = *p_arg;
}
} break;
case Variant::STRING: {
String s = *p_arg;
jstring jStr = env->NewStringUTF(s.utf8().get_data());
v.val.l = jStr;
v.obj = jStr;
value.l = jStr;
} break;
case Variant::PACKED_STRING_ARRAY: {
Vector<String> sarray = *p_arg;
@ -155,15 +152,13 @@ jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_a
env->SetObjectArrayElement(arr, j, str);
env->DeleteLocalRef(str);
}
v.val.l = arr;
v.obj = arr;
value.l = arr;
} break;
case Variant::CALLABLE: {
jobject jcallable = callable_to_jcallable(env, *p_arg);
v.val.l = jcallable;
v.obj = jcallable;
value.l = jcallable;
} break;
case Variant::DICTIONARY: {
@ -191,10 +186,10 @@ jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_a
for (int j = 0; j < keys.size(); j++) {
Variant var = dict[keys[j]];
jvalret valret = _variant_to_jvalue(env, var.get_type(), &var, true, p_depth + 1);
env->SetObjectArrayElement(jvalues, j, valret.val.l);
if (valret.obj) {
env->DeleteLocalRef(valret.obj);
jvalue valret = _variant_to_jvalue(env, var.get_type(), &var, true, p_depth + 1);
env->SetObjectArrayElement(jvalues, j, valret.l);
if (valret.l) {
env->DeleteLocalRef(valret.l);
}
}
@ -204,8 +199,7 @@ jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_a
env->DeleteLocalRef(jvalues);
env->DeleteLocalRef(dclass);
v.val.l = jdict;
v.obj = jdict;
value.l = jdict;
} break;
case Variant::ARRAY: {
@ -214,14 +208,13 @@ jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_a
for (int j = 0; j < array.size(); j++) {
Variant var = array[j];
jvalret valret = _variant_to_jvalue(env, var.get_type(), &var, true, p_depth + 1);
env->SetObjectArrayElement(arr, j, valret.val.l);
if (valret.obj) {
env->DeleteLocalRef(valret.obj);
jvalue valret = _variant_to_jvalue(env, var.get_type(), &var, true, p_depth + 1);
env->SetObjectArrayElement(arr, j, valret.l);
if (valret.l) {
env->DeleteLocalRef(valret.l);
}
}
v.val.l = arr;
v.obj = arr;
value.l = arr;
} break;
case Variant::PACKED_INT32_ARRAY: {
@ -229,8 +222,7 @@ jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_a
jintArray arr = env->NewIntArray(array.size());
const int *r = array.ptr();
env->SetIntArrayRegion(arr, 0, array.size(), r);
v.val.l = arr;
v.obj = arr;
value.l = arr;
} break;
case Variant::PACKED_INT64_ARRAY: {
@ -238,8 +230,7 @@ jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_a
jlongArray arr = env->NewLongArray(array.size());
const int64_t *r = array.ptr();
env->SetLongArrayRegion(arr, 0, array.size(), r);
v.val.l = arr;
v.obj = arr;
value.l = arr;
} break;
case Variant::PACKED_BYTE_ARRAY: {
@ -247,8 +238,7 @@ jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_a
jbyteArray arr = env->NewByteArray(array.size());
const uint8_t *r = array.ptr();
env->SetByteArrayRegion(arr, 0, array.size(), reinterpret_cast<const signed char *>(r));
v.val.l = arr;
v.obj = arr;
value.l = arr;
} break;
case Variant::PACKED_FLOAT32_ARRAY: {
@ -256,8 +246,7 @@ jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_a
jfloatArray arr = env->NewFloatArray(array.size());
const float *r = array.ptr();
env->SetFloatArrayRegion(arr, 0, array.size(), r);
v.val.l = arr;
v.obj = arr;
value.l = arr;
} break;
case Variant::PACKED_FLOAT64_ARRAY: {
@ -265,26 +254,25 @@ jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_a
jdoubleArray arr = env->NewDoubleArray(array.size());
const double *r = array.ptr();
env->SetDoubleArrayRegion(arr, 0, array.size(), r);
v.val.l = arr;
v.obj = arr;
value.l = arr;
} break;
case Variant::OBJECT: {
Ref<JavaObject> generic_object = *p_arg;
if (generic_object.is_valid()) {
jobject obj = env->NewLocalRef(generic_object->get_instance());
v.val.l = obj;
v.obj = obj;
value.l = obj;
} else {
v.val.i = 0;
value.i = 0;
}
} break;
default: {
v.val.i = 0;
value.i = 0;
} break;
}
return v;
value.l = env->PopLocalFrame(value.l);
return value;
}
String _get_class_name(JNIEnv *env, jclass cls, bool *array) {
@ -299,6 +287,7 @@ String _get_class_name(JNIEnv *env, jclass cls, bool *array) {
}
String name = jstring_to_string(clsName, env);
env->DeleteLocalRef(clsName);
env->DeleteLocalRef(cclass);
return name;
}
@ -360,6 +349,7 @@ Variant _jobject_to_variant(JNIEnv *env, jobject obj, int p_depth) {
jclass nclass = jni_find_class(env, "java/lang/Number");
jmethodID longValue = env->GetMethodID(nclass, "longValue", "()J");
jlong ret = env->CallLongMethod(obj, longValue);
env->DeleteLocalRef(nclass);
return ret;
}
@ -400,6 +390,7 @@ Variant _jobject_to_variant(JNIEnv *env, jobject obj, int p_depth) {
jclass nclass = jni_find_class(env, "java/lang/Number");
jmethodID doubleValue = env->GetMethodID(nclass, "doubleValue", "()D");
double ret = env->CallDoubleMethod(obj, doubleValue);
env->DeleteLocalRef(nclass);
return ret;
}
@ -558,6 +549,11 @@ void setup_android_class_loader() {
android_class_loader = nullptr;
ERR_FAIL_MSG("Failed to find method ID for ClassLoader::loadClass.");
}
env->DeleteLocalRef(class_loader_class);
env->DeleteLocalRef(class_loader);
env->DeleteLocalRef(class_class);
env->DeleteLocalRef(known_class);
}
void cleanup_android_class_loader() {
@ -577,17 +573,22 @@ jclass jni_find_class(JNIEnv *p_env, const char *p_class_name) {
ERR_FAIL_NULL_V(p_env, nullptr);
ERR_FAIL_NULL_V(p_class_name, nullptr);
jobject class_object = nullptr;
if (!android_class_loader || !load_class_method) {
ERR_PRINT("Android ClassLoader is not initialized. Falling back to FindClass.");
return p_env->FindClass(p_class_name);
class_object = p_env->FindClass(p_class_name);
} else {
jstring java_class_name = p_env->NewStringUTF(p_class_name);
class_object = p_env->CallObjectMethod(
android_class_loader,
load_class_method,
java_class_name);
p_env->DeleteLocalRef(java_class_name);
}
if (p_env->ExceptionCheck()) {
p_env->ExceptionDescribe();
p_env->ExceptionClear();
}
jstring java_class_name = p_env->NewStringUTF(p_class_name);
jobject class_object = p_env->CallObjectMethod(
android_class_loader,
load_class_method,
java_class_name);
p_env->DeleteLocalRef(java_class_name);
ERR_FAIL_NULL_V_MSG(class_object, nullptr, vformat("Failed to find Java class: \"%s\".", p_class_name));
return static_cast<jclass>(class_object);
}

8
platform/android/jni_utils.h
View file

@ -38,13 +38,7 @@
#include <jni.h>
struct jvalret {
jobject obj;
jvalue val;
jvalret() { obj = nullptr; }
};
jvalret _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_arg, bool force_jobject = false, int p_depth = 0);
jvalue _variant_to_jvalue(JNIEnv *env, Variant::Type p_type, const Variant *p_arg, bool force_jobject = false, int p_depth = 0);
String _get_class_name(JNIEnv *env, jclass cls, bool *array);

8
platform/android/variant/callable_jni.cpp
View file

@ -91,8 +91,8 @@ JNIEXPORT jobject JNICALL Java_org_godotengine_godot_variant_Callable_nativeCall
Callable::CallError err;
Variant result;
callable.callp(argptrs, count, result, err);
jvalret jresult = _variant_to_jvalue(p_env, result.get_type(), &result, true);
ret = jresult.obj;
jvalue jresult = _variant_to_jvalue(p_env, result.get_type(), &result, true);
ret = jresult.l;
}
// Manually invoke the destructor to decrease the reference counts for the variant arguments.
@ -107,8 +107,8 @@ JNIEXPORT jobject JNICALL Java_org_godotengine_godot_variant_Callable_nativeCall
Callable callable = _generate_callable(p_env, p_object_id, p_method_name, p_parameters);
if (callable.is_valid()) {
Variant result = callable.call();
jvalret jresult = _variant_to_jvalue(p_env, result.get_type(), &result, true);
return jresult.obj;
jvalue jresult = _variant_to_jvalue(p_env, result.get_type(), &result, true);
return jresult.l;
} else {
return nullptr;
}