React 16.0 released

React 16.0 is released today which is built on top of new core architecture named 'Fiber'.
Most importantly, they are not breaking backward compatibility like what Angular did while releasing 2.0.

They are now using MIT open source licence so all the confusion around licencing issues is gone.

Here is a link which gives detailed overview of the release.

https://facebook.github.io/react/blog/2017/09/26/react-v16.0.html

Java 9 releasing on 21 September 2017

After postponing release many times, finally Java 9 will be releasing on 21 September 2017.
It is much awaited release of Java as there are many structural changes coming with this release in platform.
Java 9 is Modular Java.
Pre-general availability documentation is available on Oracle website.

Link to documentation:
https://docs.oracle.com/javase/9/whatsnew/toc.htm#JSNEW-GUID-C23AFD78-C777-460B-8ACE-58BE5EA681F6

More details about Java 9 project is available at:
http://openjdk.java.net/projects/jdk9/

Java 9 is finally released and JDK download link is:
http://www.oracle.com/technetwork/java/javase/downloads/jdk9-downloads-3848520.html

Interceptor for Spring Rest controller

Create a java class which extends HandlerInterceptorAdapter.

You can override preHandle and postHandle methods as per your requirement.

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("In Prehandle");
}
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    System.out.println("In postHandle");
}

In spring-mvc-context.xml file, define class as interceptor as

 
  

Now your interceptor class should intercept all requests towards Rest controller. 

Amazon Web Services - Getting started

Registration:

• After filling basic information, you need to fill billing information (Credit card details) during the registration process.
• After entering billing information, Transaction of Rs. 2 will be initiated to verify your Billing details (Transaction will be cancelled later by Amazon automatically).
• Verification of Phone/Mobile with Automated Call.
• Post verification, your account will be created.

Getting Started with Amazon Web Service Cloud:

• On AWS dashboard, there are different options to start with, Choose - Launch a Virtual Machine option

• Type Name for your instance.
• There will be option to download private key to connect to instance.
• Download private key(*.pem format)
• After you submit, your instance will be launched successfully.
• You can view the instance from Instances option of EC2 Dashboard.

Connecting to Virtual Machine using Putty:

• You need to generate private key using PuttyGen application.
• Load your_key.pem in PuttyGen by clicking Load button.
• Click on generate private key button. (It will warning message to save key without passcode. Select Yes).
• Save the private key (format *.ppk)
• Open Putty terminal window.
• Default user for VM is "ec2-user".
• Check Public DNS of your Virtual machine on EC2 dashboard. Format of DNS is like ëc2-*-2.compute.amazonaws.com
• Enter hostname as : ec2-user@public-DNS of your VM. - ec2-user@ec2-*-us-east-2.compute.amazonaws.com
• Enter port as 22.
• Open SSH tab on left and on Auth tab - Select private key file as *.ppk file which is generated using PuttyGen tool.
• Click on Open. You should be able to connect to Virtual Machine.

TroubleShooting while connecting to VM:

• By default, IP address for Inbound connections on VM is the one from which you have created Virtual Machine and it is managed by Security Groups.
• Check which Security Group is assigned to your VM in Description at the bottom.
• View Inbound Rules - Set source IP as 0.0.0.0/0 for Port 22 if it is not already set as 0.0.0.0/0
• Now you should be able to connect.

You will see Terminal console with following message:

Using username "ec2-user".
Authenticating with public key "imported-openssh-key"
       __|  __|_  )
       _|  (     /   Amazon Linux AMI
      ___|\___|___|
https://aws.amazon.com/amazon-linux-ami/2017.03-release-notes/
1 package(s) needed for security, out of 3 available
Run "sudo yum update" to apply all updates.
[machine-info/] $

Note:
By default, JDK version .7 is installed on VM. You can change it to JDK version 8