RESTful web service In 5 Minutes using DropWizard

These days I am Learning new framework called "Dropwizard".So I thought I want to share what I learn from Dropwizard. Before going to what is Dropwizard I want to tell some difficulties when building rest server application.When I was in university I don't know how to implement Restful webservice and i thought it was difficult task even for  Testing purpose.Then I learn apache CXF web server and the problem was there are lot of dependencies need to create rest server. Ex:-Apache Cxf,Jackson serialization library,log4j for logging ,Junit for Testing And other libraries.So Even for me to hard to remember all the dependency libraries. So the Solution is Dropwizard. Dropwizard is Lightweight framework which have all the dependencies in one place. Dropwizard also support to expand to your project in layered structure such as api/db/client.

What is Drop-wizard

Drop wizard is simply All the listed libraries in one package.

• metrics
• jetty
• jersey
• jackson
• jdbi
• hibernate
• logback
• mustache
• freemarker

Start Using Maven archetype

1 2	mvn archetype:generate -DgroupId=dec.mchoice.tech.talk -DartifactId=Sample-dw-app -Dname=SampleApplication -Dpackage=dev.mchoice.tech.talk dev.innova.drp -DarchetypeGroupId=io.dropwizard.archetypes -DarchetypeArtifactId=java-simple -DinteractiveMode=false

After creating project it will create this kind of project structure.

Biggest advantage of use maven archetype no need to configure any dependencies or plugin in POM.xml file and it will generate executable jar file .  Next step is create Rest API end point.

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@Path("/student") public class StudentManagement { @POST @Timed @Path("/save") @Produces(MediaType.APPLICATION_JSON) @Consumes({MediaType.APPLICATION_JSON}) public Response addPerson(Student student) { Map<String, Object> response = new HashMap<>(); response.put("statusCode", "S1000"); response.put("description", "Successfully added Student"); return Response.ok(response).build(); } }

And then you have to register your rest API in drop wizard configuration.

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@Override public void run(final SampleApplicationConfiguration configuration, final Environment environment) { environment.jersey().register(new StudentManagement()); }

And now All the API related stuff are finished.So you need to run your Application.First go to target folder in project and run

1	java -jar Sample-dw-app-1.0-SNAPSHOT.jar server

After running it will start in 8080 port(application port) and there is another port 8081 (Admin port ).
Next tutorial we will discuss how to change the default configurations and what are the usages of admin port.

Then you can use curl request or postmen to send request and check the Rest API.