From 9dbc1968376f936264ca185898b4b1ab4118b057 Mon Sep 17 00:00:00 2001
From: Myk Melez <myk@mozilla.org>
Date: Tue, 5 Aug 2014 11:55:34 -0700
Subject: [PATCH 1/2] make ClassNotFoundException a subclass of Error

---
 classes.js | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/classes.js b/classes.js
index 7abc9e57..48034314 100644
--- a/classes.js
+++ b/classes.js
@@ -13,8 +13,12 @@ var Classes = function() {
     }
 }
 
-Classes.ClassNotFoundException = function() {
-}
+Classes.ClassNotFoundException = function(message) {
+    this.message = message;
+};
+Classes.ClassNotFoundException.prototype = new Error();
+Classes.ClassNotFoundException.prototype.name = "ClassNotFoundException";
+Classes.ClassNotFoundException.prototype.constructor = Classes.ClassNotFoundException;
 
 Classes.prototype.addPath = function(name, data) {
     if (name.substr(-4) === ".jar") {
@@ -63,7 +67,7 @@ Classes.prototype.loadClassFile = function(fileName) {
     console.info("loading " + fileName + " ...");
     var bytes = this.loadFile(fileName);
     if (!bytes)
-        throw new (Classes.ClassNotFoundException)();
+        throw new (Classes.ClassNotFoundException)(fileName);
     var self = this;
     var classInfo = this.loadClassBytes(bytes);
     if (classInfo.superClassName)

From a798f311167be8b451f173dd04c7f24e4743251f Mon Sep 17 00:00:00 2001
From: Myk Melez <myk@mozilla.org>
Date: Tue, 5 Aug 2014 12:15:13 -0700
Subject: [PATCH 2/2] use Object.create to clarify intent

---
 classes.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/classes.js b/classes.js
index 48034314..31a13a16 100644
--- a/classes.js
+++ b/classes.js
@@ -16,7 +16,7 @@ var Classes = function() {
 Classes.ClassNotFoundException = function(message) {
     this.message = message;
 };
-Classes.ClassNotFoundException.prototype = new Error();
+Classes.ClassNotFoundException.prototype = Object.create(Error.prototype);
 Classes.ClassNotFoundException.prototype.name = "ClassNotFoundException";
 Classes.ClassNotFoundException.prototype.constructor = Classes.ClassNotFoundException;