diff --git a/platform/core-api/src/com/intellij/openapi/vfs/InvalidVirtualFileAccessException.java b/platform/core-api/src/com/intellij/openapi/vfs/InvalidVirtualFileAccessException.java
index c9b1be7b407e..e8feca529c24 100644
--- a/platform/core-api/src/com/intellij/openapi/vfs/InvalidVirtualFileAccessException.java
+++ b/platform/core-api/src/com/intellij/openapi/vfs/InvalidVirtualFileAccessException.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2012 JetBrains s.r.o.
+ * Copyright 2000-2013 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,6 +20,25 @@ package com.intellij.openapi.vfs;
  */
 public class InvalidVirtualFileAccessException extends RuntimeException {
   public InvalidVirtualFileAccessException(final VirtualFile file) {
-    super("Accessing invalid virtual file: " + file.getUrl());
+    super(composeMessage(file));
+  }
+
+  private static String composeMessage(VirtualFile file) {
+    String url = file.getUrl();
+    String message = "Accessing invalid virtual file: " + url;
+
+    try {
+      VirtualFile found = VirtualFileManager.getInstance().findFileByUrl(url);
+      message += "; original:" + hashCode(file) + "; found:" + hashCode(found);
+    }
+    catch (Throwable t) {
+      message += "; lookup failed: " + t.getMessage();
+    }
+
+    return message;
+  }
+
+  private static int hashCode(Object o) {
+    return o != null ? o.hashCode() : 0;
   }
 }
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