Dropwizard Example

Preconditions

• Maven should be present in the system. 
  Maven is a software and comprehension tool for project management. It is based on the concept of a POM(Project Object Model). Maven can manage a project's build, reporting, and documentation from a central piece of information. To verify if maven is present type ‘run mvn -v’ in the command prompt. If not present visit the official download page for installation. 
   
• Change the JAVA_HOME directory and point it to JDK 8. 
  Java JDK8 is a release of the world's #1 development platform. It includes an upgradation to the Java programming mode. It coordinated with the evolution of the JVM, libraries, and Java language. JDK 8 includes features like productivity, ease of use, improved programming, performance, and security. 
   
• Curl must be available in the system. 
  Curl is open-source and free software. It is used in scripts or command lines to transfer data. Curl is also used in cars, routers, television sets, printers, audio equipment, mobile phones, media players, etc. It is the Internet transfer engine for thousands of software applications. It has over ten billion installations as well. To check if curl is present type ‘curl’ and hit enter in the console. The system will give you a help command (‘curl –help’) showing the presence of curl. If not present visit the download page to install curl.  

Preparation for Application

To start the dropwizard example application, we must perform the following steps.

- Go to the start menu.

- Open cmd(Command prompt) or terminal.

- Browse the project folder of your application.

- Type 'mvn clean install' to install maven.

- Use the 'db migrate' command to apply all the pending changes.

java -jar target/dropwizard-example-1.0.0.jar db migrate hello.yml

- The above command will create a new schema for your application.

Starting the Application

To start your dropwizard example application, run the below command.

java -jar target/dropwizard-example-1.0.0.jar server hello.yml

If you are using an IDE, the command will be as follows.

com.example.codingninja.CodingNinjasApplication server hello.yml

After starting the application, you can perform various operations on it. So, let’s discuss how to work with the application.

Working

Insert operation: If you want to insert a record of a new student in the schema. The command will be as follows.

curl -H "Content-Type: application/json" -d '{"Email":"CodingNinja@gmail.com",  "Password" : "XXXXX"}' 

http://localhost:8080/hello

In this command, first, we give the content type, which is the application of JSON format. Then, we will pass on the details of the student. Then use localhost to run the application on the browser.

Example:

If your application has a login form, fill in the details. Then click on the login button to submit the details. Then this command will send the email and password to the database to save your details. 

Advantages of Dropwizard

Let’s now discuss the benefits of using dropwizard. 

• Helps in developing high-performance Restful web services.
• Provide integration with the third-party framework.
• Supports rapid prototyping.
• Provides open-source and free libraries. 
• Support for configuration, logging, etc. 
• Provide operation tools and application metrics.
   

This was all about the Dropwizard Example. Let's now discuss some frequently asked questions related to our topic.  

Frequently Asked Questions

What is Dropwizard? 

Dropwizard is an open-source framework of Java. It is used for the fast development of high-performance RESTful web services. 

What is the dropwizard example application?

The dropwizard example application provides example codes for the features of dropwizard. 

What is curl?

Curl is open-source and free software. It is used in scripts or command lines to transfer data.

What is Maven?

Maven is a software tool used for project management. It is based on the concept of a POM(Project Object Model).  

What is bootstrap in Dropwizard?

The bootstrap is a pre-start (temporary) application environment. It contains all of the components needed to bootstrap a Dropwizard command.

Conclusion 

This article contains basic information about the Dropwizard Example module. In this article, we have discussed the pre-conditions to start the application. Along with the discussion of how to start and work on these applications. The reader can carry out a thorough understanding of the topic by referring to the Official Documentation. For more information, Refer-

• Dropwizard JDBI3
• Dropwizard Migrations
• Dropwizard Forms
   

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Happy Coding!