Add Windows stub in seperate file.

Author: rjauhari2

tensorflow-core/tensorflow-core-native/src/main/native/org/tensorflow/internal/c_api/tfe_serverdef_stub.cc

@@ -0,0 +1,41 @@
+/* Copyright 2025 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#ifdef _WIN32
+
+#include "tensorflow/c/c_api.h"
+#include "tensorflow/c/c_api_experimental.h"
+
+// On Windows, the TensorFlow C library currently does not export TFE_GetServerDef.
+// Provide a local stub so that the JNI native library can link successfully.
+// The stub simply sets the status to TF_UNIMPLEMENTED and returns an empty
+// TF_Buffer.
+extern "C" TF_Buffer* TFE_GetServerDef(const char* text_proto, TF_Status* status) {
+    if (status != nullptr) {
+        TF_SetStatus(status, TF_UNIMPLEMENTED,
+                     "TFE_GetServerDef is not available in the Windows build of libtensorflow.");
+    }
+    // Allocate an empty TF_Buffer on the heap so that callers can still call
+    // TF_DeleteBuffer() on the returned pointer safely.
+    TF_Buffer* buf = static_cast<TF_Buffer*>(malloc(sizeof(TF_Buffer)));
+    if (buf != nullptr) {
+        buf->data = nullptr;
+        buf->length = 0;
+        buf->data_deallocator = nullptr;
+    }
+    return buf;
+}
+
+#endif // _WIN32

tensorflow-core/tensorflow-core-native/src/main/native/org/tensorflow/internal/c_api/tfj_graph.h

@@ -1,4 +1,4 @@
-/* Copyright 2024 The TensorFlow Authors. All Rights Reserved.
+/* Copyright 2025 The TensorFlow Authors. All Rights Reserved.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -30,4 +30,9 @@ TF_CAPI_EXPORT extern void TFJ_UnmapOperationName(TF_Graph* g, TF_Operation* ope
 
 #include "tfj_graph_impl.cc" // include CC file in its header to compile it with JavaCPP
 
+#ifdef _WIN32
+// Ensure the Windows-specific stub for TFE_GetServerDef is linked.
+#include "tfe_serverdef_stub.cc"
+#endif
+
 #endif  // TENSORFLOW_JAVA_GRAPH_H_

tensorflow-core/tensorflow-core-native/src/main/native/org/tensorflow/internal/c_api/tfj_graph_impl.cc

@@ -34,21 +34,4 @@ void TFJ_UnmapOperationName(TF_Graph* g, TF_Operation* operation) {
 TFJ_GraphId TFJ_GetGraphId(const TF_Graph* g) { return NULL; }
 void TFJ_UnmapOperationName(TF_Graph* g, TF_Operation* operation) {}
 
-// Provide stub for missing TFE_GetServerDef symbol on Windows.
-#include "tensorflow/c/c_api.h"
-#include "tensorflow/c/c_api_experimental.h"
-extern "C" TF_Buffer* TFE_GetServerDef(const char* text_proto, TF_Status* status) {
-    if (status != nullptr) {
-        TF_SetStatus(status, TF_UNIMPLEMENTED,
-                     "TFE_GetServerDef is not supported on Windows build of libtensorflow.");
-    }
-    TF_Buffer* buf = static_cast<TF_Buffer*>(malloc(sizeof(TF_Buffer)));
-    if (buf != nullptr) {
-        buf->data = nullptr;
-        buf->length = 0;
-        buf->data_deallocator = nullptr;
-    }
-    return buf;
-}
-
 #endif // #indef _WIN32