improves uri handling

Author: Alvaro Videla

test/src/com/rabbitmq/examples/perf/ScenarioFactory.java

@@ -7,18 +7,18 @@
 
 public class ScenarioFactory {
     public static Scenario fromJSON(Map json, ConnectionFactory factory) {
+        String uri = "amqp://localhost";
         String type = read("type", json, String.class);
         String name = read("name", json, String.class);
         Integer interval = read("interval", json, Integer.class, 1000);
         List paramsJSON = read("params", json, List.class);
 
-        String uri = read("uri", json, String.class);
         try {
+            uri = read("uri", json, String.class);
             factory.setUri(uri);
         } catch(Exception e) {
-            System.out.println("scenario: " + name + " with malformed uri: "
-                               + uri + " - " + e.getMessage());
-            System.exit(1);
+            throw new RuntimeException("scenario: " + name + " with malformed uri: "
+                                       + uri + " - " + e.getMessage());
         }
 
         MulticastParams[] params = new MulticastParams[paramsJSON.size()];