Properly overrides the Exception class.

JSONException.java

@@ -8,7 +8,6 @@ package org.json;
  */
 public class JSONException extends RuntimeException {
     private static final long serialVersionUID = 0;
-    private Throwable cause;
 
     /**
      * Constructs a JSONException with an explanatory message.
@@ -16,28 +15,18 @@ public class JSONException extends RuntimeException {
      * @param message
      *            Detail about the reason for the exception.
      */
-    public JSONException(String message) {
+    public JSONException(final String message) {
 	super(message);
     }
 
     /**
      * Constructs a new JSONException with the specified cause.
-     * @param cause The cause.
+     * 
+     * @param cause
+     *            The cause.
      */
-    public JSONException(Throwable cause) {
-        super(cause.getMessage());
-        this.cause = cause;
+    public JSONException(final Throwable cause) {
+	super(cause.getMessage(), cause);
     }
 
-    /**
-     * Returns the cause of this exception or null if the cause is nonexistent
-     * or unknown.
-     *
-     * @return the cause of this exception or null if the cause is nonexistent
-     *          or unknown.
-     */
-    @Override
-    public Throwable getCause() {
-        return this.cause;
-    }
 }