Added volatile word to the cache manager

src/main/java/com/eagle/hubnotifier/cache/CategoryCacheManager.java

@@ -20,7 +20,7 @@
 public class CategoryCacheManager {
 
 	// Singleton Instance
-	private static CategoryCacheManager cacheManager;
+	private static volatile CategoryCacheManager cacheManager;
 
 	// Map to store the Category details
 	private Map<Integer, String> categoryMap = null;