--- a/langtools/test/tools/javadoc/ReleaseOption.java	Wed Aug 10 13:52:02 2016 -0700
+++ b/langtools/test/tools/javadoc/ReleaseOption.java	Wed Aug 10 15:47:46 2016 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2016, 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
@@ -21,7 +21,7 @@
  * questions.
  */
 
-import com.sun.tools.javadoc.Main;
+import java.io.File;
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.ArrayList;
@@ -29,6 +29,8 @@
 import java.util.List;
 import java.util.function.Predicate;
 
+import com.sun.tools.javadoc.Main;
+
 /**
  * @test
  * @bug 8086737
@@ -52,16 +54,16 @@
         List<String> options = new ArrayList<>();
         options.addAll(Arrays.asList(args));
         options.add("-XDrawDiagnostics");
-        options.add(System.getProperty("test.src", ".") + java.io.File.separatorChar + "ReleaseOptionSource.java");
+        options.add(new File(System.getProperty("test.src", "."), "ReleaseOptionSource.java").getPath());
         StringWriter out = new StringWriter();
         PrintWriter pw = new PrintWriter(out);
         int actualResult = Main.execute("javadoc", pw, pw, pw, "com.sun.tools.doclets.formats.html.HtmlDoclet", options.toArray(new String[0]));
         System.err.println("actual result=" + actualResult);
         System.err.println("actual output=" + out.toString());
         if (actualResult != expectedResult)
-            throw new Error();
+            throw new Error("Exit code not as expected");
         if (!validate.test(out.toString())) {
-            throw new Error("Not an expected error output: " + out.toString());
+            throw new Error("Output not as expected");
         }
     }
 }