review changes

Author: adkumar3

README.md

@@ -69,6 +69,7 @@ You do not need to download and build the source to use the SDK but if you want
     - Set customHttpClassEnabled to true to make use of Custom Http Library. 
       - Enter the custom class name in customHttpClass field. Provide the full package name along with the class name.
         example customHttpClass= <packagename.customHttpClass>
+      - The custom HTTP Class must have a three argument constructor which accepts MerchantConfig, DocumentBuilder and LoggerWrapper as argument. Then it should call the constructor of the parent class.
 - Build this project using Maven.
 a. mvn clean  // Cleans the Project
 

java/src/main/java/com/cybersource/ws/client/Connection.java

@@ -47,8 +47,15 @@ abstract class Connection {
     final MerchantConfig mc;
     private final DocumentBuilder builder;
     final LoggerWrapper logger;
-
-   protected Connection(MerchantConfig mc, DocumentBuilder builder,
+    
+   /**
+    * It initializes three arguments MerchantConfig, DocumentBuilder and Logger
+    * Any class extending this class must implement three argument constructor
+    * @param mc
+    * @param builder
+    * @param logger
+ */
+protected Connection(MerchantConfig mc, DocumentBuilder builder,
                LoggerWrapper logger) {
         this.mc = mc;
         this.builder = builder;