src/java.base/windows/native/libjava/ProcessHandleImpl_win.c

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, 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

@@ -467,20 +467,32 @@
         JNU_CHECK_EXCEPTION(env);
     }
 }
 
 static void getCmdlineInfo(JNIEnv *env, HANDLE handle, jobject jinfo) {
-    char exeName[1024];
-    int bufsize = sizeof exeName;
-    jstring commandObj;
-
-    if (QueryFullProcessImageName(handle, 0,  exeName, &bufsize)) {
-        commandObj = (*env)->NewStringUTF(env, exeName);
+    WCHAR exeName[1024];
+    WCHAR *longPath;
+    DWORD bufsize = sizeof(exeName)/sizeof(WCHAR);
+    jstring commandObj = NULL;
+
+    if (QueryFullProcessImageNameW(handle, 0,  exeName, &bufsize)) {
+        commandObj = (*env)->NewString(env, (const jchar *)exeName,
+                                       (jsize)wcslen(exeName));
+    } else if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
+        bufsize = 32768;
+        longPath = (WCHAR*)malloc(bufsize * sizeof(WCHAR));
+        if (longPath != NULL) {
+            if (QueryFullProcessImageNameW(handle, 0, longPath, &bufsize)) {
+                commandObj = (*env)->NewString(env, (const jchar *)longPath,
+                                               (jsize)wcslen(longPath));
+            }
+            free(longPath);
+        }
+    }
         CHECK_NULL(commandObj);
         (*env)->SetObjectField(env, jinfo,
                                ProcessHandleImpl_Info_commandID, commandObj);
-    }
 }
 
 static void procToUser(JNIEnv *env, HANDLE handle, jobject jinfo) {
 #define TOKEN_LEN 256
     DWORD token_len = TOKEN_LEN;