src/java.desktop/windows/native/libawt/windows/awt_Component.cpp

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1996, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -3809,10 +3809,13 @@
 void AwtComponent::OpenCandidateWindow(int x, int y)
 {
     UINT bits = 1;
     POINT p = {0, 0}; // upper left corner of the client area
     HWND hWnd = GetHWnd();
+    if (!::IsWindowVisible(hWnd)) {
+        return;
+    }
     HWND hTop = GetTopLevelParentForWindow(hWnd);
     ::ClientToScreen(hTop, &p);
     if (!m_bitsCandType) {
         SetCandidateWindow(m_bitsCandType, x - p.x, y - p.y);
         return;

@@ -4081,10 +4084,13 @@
 //
 // Inquires candidate position according to the composed text
 //
 void AwtComponent::InquireCandidatePosition()
 {
+    if (!::IsWindowVisible(GetHWnd())) {
+        return;
+    }
     JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);
 
     // get global reference of WInputMethod class (run only once)
     static jclass wInputMethodCls = NULL;
     if (wInputMethodCls == NULL) {