document multi-arg logging, see #1856

akka-docs/java/code/akka/docs/event/LoggingDocTestBase.java

@@ -33,7 +33,7 @@ import akka.actor.DeadLetter;
 //#imports-deadletter
 
 public class LoggingDocTestBase {
-
+  
   @Test
   public void useLoggingActor() {
     ActorSystem system = ActorSystem.create("MySystem");
@@ -55,6 +55,16 @@ public class LoggingDocTestBase {
     //#deadletters
     system.shutdown();
   }
+  
+  @Test
+  public void demonstrateMultipleArgs() {
+    final ActorSystem system = ActorSystem.create("multiArg");
+    //#array
+    final Object[] args = new Object[] { "The", "brown", "fox", "jumps", 42 };
+    system.log().debug("five parameters: {}, {}, {}, {}, {}", args);
+    //#array
+    system.shutdown();
+  }
 
   //#my-actor
   class MyActor extends UntypedActor {