diff --git a/include/dxfeed_graal_cpp_api/api/DXPublisherObservableSubscription.hpp b/include/dxfeed_graal_cpp_api/api/DXPublisherObservableSubscription.hpp
index 1c584e4e..e1beeac3 100644
--- a/include/dxfeed_graal_cpp_api/api/DXPublisherObservableSubscription.hpp
+++ b/include/dxfeed_graal_cpp_api/api/DXPublisherObservableSubscription.hpp
@@ -27,6 +27,8 @@ DXFCXX_DISABLE_MSC_WARNINGS_PUSH(4251)
 DXFCPP_BEGIN_NAMESPACE
 
 class DXFCPP_EXPORT DXPublisherObservableSubscription : public ObservableSubscription, public SharedEntity {
+    JavaObjectHandle<DXPublisherObservableSubscription> handle_;
+
   public:
     bool isClosed() override;
     std::unordered_set<EventTypeEnum> getEventTypes() override;
diff --git a/include/dxfeed_graal_cpp_api/isolated/api/IsolatedDXPublisherObservableSubscription.hpp b/include/dxfeed_graal_cpp_api/isolated/api/IsolatedDXPublisherObservableSubscription.hpp
new file mode 100644
index 00000000..a4d522c6
--- /dev/null
+++ b/include/dxfeed_graal_cpp_api/isolated/api/IsolatedDXPublisherObservableSubscription.hpp
@@ -0,0 +1,47 @@
+// Copyright (c) 2024 Devexperts LLC.
+// SPDX-License-Identifier: MPL-2.0
+
+#pragma once
+
+#include "../../internal/Conf.hpp"
+
+#include <unordered_set>
+
+DXFCXX_DISABLE_MSC_WARNINGS_PUSH(4251)
+
+#include "../../api/DXPublisherObservableSubscription.hpp"
+
+DXFCPP_BEGIN_NAMESPACE
+
+namespace isolated::api::IsolatedDXPublisherObservableSubscription {
+/**
+ * Calls the Graal SDK function `dxfg_ObservableSubscription_isClosed` in isolation.
+ *
+ * @param sub The subscription's handle.
+ * @return Returns `true` if this subscription is closed.
+ * @throws std::invalid_argument if DXPublisherObservableSubscription's handle is invalid.
+ * @throws JavaException if something happened with the dxFeed API backend.
+ * @throws GraalException if something happened with the GraalVM.
+ */
+bool /* int32_t */
+isClosed(/* dxfg_observable_subscription_t * */ const JavaObjectHandle<DXPublisherObservableSubscription> &sub);
+
+
+std::unordered_set<EventTypeEnum> /* dxfg_event_clazz_list_t* */ getEventTypes(
+    /* dxfg_observable_subscription_t * */ const JavaObjectHandle<DXPublisherObservableSubscription> &sub);
+bool /* int32_t */ containsEventType(
+    /* dxfg_observable_subscription_t * */ const JavaObjectHandle<DXPublisherObservableSubscription> &sub,
+    /* dxfg_event_clazz_t */ EventTypeEnum eventType);
+void /* int32_t */ addChangeListener(
+    /* dxfg_observable_subscription_t * */ const JavaObjectHandle<DXPublisherObservableSubscription> &sub,
+    /* dxfg_observable_subscription_change_listener_t * */ const JavaObjectHandle<ObservableSubscriptionChangeListener>
+        &listener);
+void /* int32_t */ removeChangeListener(
+    /* dxfg_observable_subscription_t * */ const JavaObjectHandle<DXPublisherObservableSubscription> &sub,
+    /* dxfg_observable_subscription_change_listener_t * */ const JavaObjectHandle<ObservableSubscriptionChangeListener>
+        &listener);
+} // namespace isolated::api::IsolatedDXPublisherObservableSubscription
+
+DXFCPP_END_NAMESPACE
+
+DXFCXX_DISABLE_MSC_WARNINGS_POP()
\ No newline at end of file
diff --git a/src/internal/JavaObjectHandle.cpp b/src/internal/JavaObjectHandle.cpp
index 4634632f..21893ddc 100644
--- a/src/internal/JavaObjectHandle.cpp
+++ b/src/internal/JavaObjectHandle.cpp
@@ -57,5 +57,6 @@ template struct JavaObjectHandle<DayFilter>;
 template struct JavaObjectHandle<TimeFormat>;
 
 template struct JavaObjectHandle<ObservableSubscriptionChangeListener>;
+template struct JavaObjectHandle<DXPublisherObservableSubscription>;
 
 DXFCPP_END_NAMESPACE
\ No newline at end of file