Added extra bean named 'message2' and added private constructor for s…

…ingleton. Also, updated the Errata with new corrections.
Stuthemp · Mar 18, 2018 · b666f17 · b666f17
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diff --git a/9781484228074_Errata.pdf b/9781484228074_Errata.pdf
diff --git a/chapter03/bean-instantiation-mode/src/main/java/com/apress/prospring5/ch3/Singleton.java b/chapter03/bean-instantiation-mode/src/main/java/com/apress/prospring5/ch3/Singleton.java
@@ -10,4 +10,8 @@ public class Singleton {
     public static Singleton getInstance() {
         return instance; 
     }
+
+    private Singleton(){
+        // needed so developers cannot instantiate this class directly
+    }
 }
diff --git a/chapter03/constructor-injection/src/main/resources/spring/app-context-annotation.xml b/chapter03/constructor-injection/src/main/resources/spring/app-context-annotation.xml
@@ -14,4 +14,14 @@
 
     <bean id="message" class="java.lang.String"
           c:_0="I hope that someone gets my message in a bottle"/>
+
+    <bean id="message2" class="java.lang.String"
+          c:_0="I know I won't be injected :("/>
 </beans>
+
+
+<!--  Java provides a no-arg constructor by default
+if it does not extend except Object class and has no any constructors.
+ In page 105, the class Singleton should have a private constructor
+  otherwise anybody can get an instance of it by calling new operator,
+   which breaks the rule single instance in a container. -->