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Dropwizard

• Java framework for developing ops-friendly, high-performance, RESTful web services
• Out-of-the-box support for sophisticated
  • configuration
  • application metrics
  • logging
  • operational tools
• Provide production-quality web service

Components - Jetty

• Jetty for HTTP - embed an incredibly tuned HTTP server directly into your project
  Dropwizard uses main method which spins up an HTTP server
  Runs the application as a simple proces
  Allows you to use all of the existing Unix process management tools instead
• Collection of Connector that accept TCP connections
• Collection of Handler that service the requests from the connections and produce responses, with threads from the ThreadPool doing the work.
• Full features of the Servlet API are only available if you configure the appropriate handlers - Example: the session API on the request is inactive unless the request has been passed to a SessionHandler
• The job of configuring Jetty is building a tree of connectors and handlers and providing their individual configurations.

Components - Jersey

• Jersey for RESTful - the JAX-RS reference implementation

  ---

  Helps to write clean, testable classes which gracefully map HTTP requests to simple Java objects.

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  Runs the application as a simple proces

  ---

  Allows you to use all of the existing Unix process management tools instead

  ---

  Supports streaming output, matrix URI parameters, conditional GET requests

Components - Jackson for JSON

• Object mapper - allowing you to export your domain models directly

Components - Dropwizard Matrix

• Insights into what your code does in production
• To measure the behavior of critical components in your production environment

Components - Dropwizard Matrix

• Guava, which, in addition to highly optimized immutable data structures, provides a growing number of classes to speed up development in Java.
• Logback and slf4j for performant and flexible logging.
• Hibernate Validator, the JSR 349 reference implementation, provides an easy, declarative framework for validating user input and generating helpful and i18n-friendly error messages.
• The Apache HttpClient and Jersey client libraries allow for both low- and high-level interaction with other web services.
• JDBI is the most straightforward way to use a relational database with Java.
• Liquibase is a great way to keep your database schema in check throughout your development and release cycles, applying high-level database refactorings instead of one-off DDL scripts.
• Freemarker and Mustache are simple templating systems for more user-facing applications.

Creating the project using Maven

mvn archetype:generate -DarchetypeGroupId=io.dropwizard.archetypes \
                       -DarchetypeArtifactId=java-simple \
                       -DarchetypeVersion=1.2.2

      

Creating the project using Maven

        Define value for property 'groupId': : org.mohansun.dev
        Define value for property 'artifactId': : DWTestApp
        Define value for property 'version':  1.0-SNAPSHOT: :
        Define value for property 'package':  org.mohansun.dev: :
        [INFO] Using property: description = null
        Define value for property 'name': : DWTestApp
        [INFO] Using property: shaded = true
        Confirm properties configuration:
        groupId: org.mohansun.dev
        artifactId: DWTestApp
        version: 1.0-SNAPSHOT
        package: org.mohansun.dev
        description: null
        name: DWTestApp
        shaded: true


      

Sample Project

• Sample Dropwizard Project

References

• Dropwizard
• Jetty Architecture
• Maven: The Complete Reference