From c572fe885ed87a4079fbce0b90abab2a5f9f2867 Mon Sep 17 00:00:00 2001
From: Sabiq Ihab <sabiq.ihab@hotmail.fr>
Date: Sat, 29 Jul 2017 12:16:19 +0100
Subject: [PATCH] add check on null objects

---
 .../com/iluwatar/cqrs/commandes/CommandServiceImpl.java     | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/cqrs/src/main/java/com/iluwatar/cqrs/commandes/CommandServiceImpl.java b/cqrs/src/main/java/com/iluwatar/cqrs/commandes/CommandServiceImpl.java
index 3ee0d9d3e..f1c88a925 100644
--- a/cqrs/src/main/java/com/iluwatar/cqrs/commandes/CommandServiceImpl.java
+++ b/cqrs/src/main/java/com/iluwatar/cqrs/commandes/CommandServiceImpl.java
@@ -23,6 +23,9 @@ public class CommandServiceImpl implements ICommandService {
       query.setParameter("username", username);
       author = (Author) query.uniqueResult();
     }
+    if (author == null) {
+      throw new NullPointerException("Author " + username + " doesn't exist!");
+    }
     return author;
   }
 
@@ -33,6 +36,9 @@ public class CommandServiceImpl implements ICommandService {
       query.setParameter("title", title);
       book = (Book) query.uniqueResult();
     }
+    if (book == null) {
+      throw new NullPointerException("Book " + title + " doesn't exist!");
+    }
     return book;
   }