--- old/src/jdk.accessibility/windows/native/common/AccessBridgeDebug.h	2018-09-14 00:35:51.443357400 +0530
+++ new/src/jdk.accessibility/windows/native/common/AccessBridgeDebug.h	2018-09-14 00:35:48.875899900 +0530
@@ -54,6 +54,8 @@
     void PrintJavaDebugString(char *msg, ...);
     void wPrintJavaDebugString(wchar_t *msg, ...);
     void wPrintDebugString(wchar_t *msg, ...);
+    void initializeFileLogger();
+    void finalizeFileLogger();
 
 #ifdef __cplusplus
 }
--- old/src/jdk.accessibility/windows/native/common/AccessBridgeDebug.cpp	2018-09-14 00:36:05.228880300 +0530
+++ new/src/jdk.accessibility/windows/native/common/AccessBridgeDebug.cpp	2018-09-14 00:36:02.620549400 +0530
@@ -31,11 +31,32 @@
 #include <stdarg.h>
 #include <stdio.h>
 #include <windows.h>
+#include <cstdlib>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+static FILE* logFP = nullptr;
+static char* filePath = nullptr;
+
+void initializeFileLogger() {
+        const char* var = "JAVA_ACCESSBRIDGE_LOGFILE";
+        filePath = getenv(var);
+        if (filePath != nullptr) {
+                logFP = fopen(filePath, "w");
+                if (logFP == nullptr) {
+                        PrintDebugString("couldnot open file %s", filePath);
+                }
+        }
+}
+
+void finalizeFileLogger() {
+        if (logFP) {
+                fclose(logFP);
+                logFP = nullptr;
+        }
+}
 /**
  * print a GetLastError message
  */
@@ -89,6 +110,12 @@
         printf("\r\n");
 #endif
 #endif
+        if (logFP) {
+                va_list args;
+                va_start(args, msg);
+                fprintf(logFP, msg, args);
+                va_end(args);
+        }
     }
 
     /**
@@ -109,6 +136,12 @@
         printf("\r\n");
 #endif
 #endif
+        if (logFP) {
+                va_list args;
+                va_start(args, msg);
+                fprintf(logFP, msg, args);
+                va_end(args);
+        }
     }
     /**
      * Wide version of the method to send debugging info to the appropriate place
@@ -130,6 +163,12 @@
         printf("\r\n");
 #endif
 #endif
+        if (logFP) {
+                va_list args;
+                va_start(args, msg);
+                fwprintf(logFP, msg, args);
+                va_end(args);
+        }
     }
 
     /**
@@ -152,6 +191,12 @@
         printf("\r\n");
 #endif
 #endif
+        if (logFP){
+                va_list args;
+                va_start(args, msg);
+                fwprintf(logFP, msg, args);
+                va_end(args);
+        }
     }
 #ifdef __cplusplus
 }
--- old/src/jdk.accessibility/windows/native/libjavaaccessbridge/JavaAccessBridge.cpp	2018-09-14 00:36:19.443319700 +0530
+++ new/src/jdk.accessibility/windows/native/libjavaaccessbridge/JavaAccessBridge.cpp	2018-09-14 00:36:16.473541800 +0530
@@ -165,6 +165,7 @@
 JavaAccessBridge::JavaAccessBridge(HINSTANCE hInstance) {
     windowsInstance = hInstance;
     ATs = (AccessBridgeATInstance *) 0;
+    initializeFileLogger();
     initBroadcastMessageIDs();          // get the unique to us broadcast msg. IDs
 }
 
@@ -203,6 +204,7 @@
 
     PrintDebugString("  finished deleting ATs");
     PrintDebugString("GOODBYE CRUEL WORLD...");
+    finalizeFileLogger();
 }