OVERVIEW :
Apache Groovy Tutorial is an object-oriented programming language. It is used for Java platform. It is a static as well as a dynamic language. Groovy has features similar to Python, Ruby, Perl, and Smalltalk. Groovy can be used both as a programming language and as a scripting language for the Java Platform. Our Apache Groovy tutorial is designed for beginners and working professionals.
Groovy has many productive features like DSL support, closures, and dynamic typing. Unlike other programming languages, Groovy cannot be a replacement for Java. The Source code of Groovy complies with Java Bytecode so that it can be run on any platform where JRE is installed.
Features of Groovy
Groovy has the following features −
Support for both static and dynamic typing.
Support for operator overloading.
The native syntax for lists and associative arrays.
Native support for regular expressions.
Native support for various markup languages such as XML and HTML.
Groovy is simple for Java developers since the syntax for Java and Groovy are very similar.
You can use existing Java libraries.
Groovy extends the java.lang.Object.
GET STARTED
To choose a Region follow the below step:
1. Sign in to the AWS Management Console.
2. Choose a service to go to that service's console.
3. In the navigation bar, choose the name of the currently displayed Region. Then choose the Region to which you want
to switch.
Step instructions for how to assess and monitor the health and proper function of the application:
1. Navigate to your Amazon EC2 console and verify that you're in the correct region.
2. Choose Instance and select your launched instance.
3. Select the server to display your metadata page and choose the Status checks tab at the bottom of the page to review if your status checks passed or failed.
To verify the installation, follow the below instructions
Step 1. Connect to SSH:
Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.
In the navigation pane, choose Instances.
Select the instance and choose Connect.
Choose SSH Client
Copy the SSH command and paste it into the terminal.
ssh ec2-user@publicIP -i [Path of key pair file]If it shows an access denied message run the following command, then run the above command again to connect via ssh.
chmod 400 [Path of key pair file]Once launched in the Amazon EC2 Service, please connect to the instance via an SSH client using the ec2-user with the key pair associated at launch. Once connected as the ec2-user user, you will be able to sudo to the root user
Step 2. Verify the installation
Follow the steps to verify the Groovy installation
1. Login with ssh
2. Type the below command to check the version
3. To check the version :
groovy --version
How to use Groovy in the terminal:
1. After connecting with ssh write the below command:
sudo nano HelloWorld.groovy3. Paste the following code into the file:
println "Hello, World!"2. After that use the below command :
groovy HelloWorld.groovyThe output "Hello, World !" should appear in your terminal.
That's it! You have successfully printed "Hello, World!" using Groovy in the terminal.
4. After using the above command then verify written the below command mentioned below image:
To monitor and assess application functions:-
a. Navigate to your Amazon EC2 console and verify that you're in the correct region.
b. Choose Instances and select your launched instance.
c. Select the server to display your metadata page and choose the Status checks tab at the bottom of the page to review if your status checks passed or failed.
For detailed information on how to use this application please visit: https://www.tutorialspoint.com/groovy/index.htm
For detailed information about managing and requesting increased service please visit: https://docs.aws.amazon.com/general/latest/gr/aws_service_limits.html
