Improve output: distinguish between failed assertions (failures) and unexpected exceptions (errors), and print a filtered stack trace for any exception.

webapp/src/org/json/JSONException.java

@@ -0,0 +1,27 @@
+package org.json;
+
+/**
+ * The JSONException is thrown by the JSON.org classes then things are amiss.
+ * @author JSON.org
+ * @version 2
+ */
+public class JSONException extends Exception {
+    private Throwable cause;
+
+    /**
+     * Constructs a JSONException with an explanatory message.
+     * @param message Detail about the reason for the exception.
+     */
+    public JSONException(String message) {
+        super(message);
+    }
+
+    public JSONException(Throwable t) {
+        super(t.getMessage());
+        this.cause = t;
+    }
+
+    public Throwable getCause() {
+        return this.cause;
+    }
+}