dropwizard-elasticsearch-quickstart

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Introduction

The Dropwizard ElasticSearch quick-start was developed to, as its name implies, provide examples connecting to ElasticSearch, additionally includes key-based horizontal application-level database sharding example.

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Overview

Included with this application is an example of DBModule (Maria/MySQL database) and the SearchModule (ElasticSearch). The examples provided illustrate a few of the features available in ElasticSearch using JEST - Java HTTP Rest client for ElasticSearch and Key-based database sharding using DB sharding bundle, along with demonstrating how these are used from within Dropwizard.

The database example is comprised of the following classes:

• The UserDAO illustrates using the Data Access Object pattern with assisting of Hibernate.
• The User illustrates mapping of Java classes to database tables.
• The UserResource is the REST resource which use the UserDAO to retrieve data from the database, note the injection of the UserDAO in their constructors.

As with all the modules the db example is wired up in the initialize function of the Application.

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Setting up the project

Install HomeBrew

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

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Install JAVA JDK (version 8)

You can use this article : https://www.cs.dartmouth.edu/~scot/cs10/mac_install/mac_install.html

check with this command if JAVA_HOME environment variable is available in your system:

echo $JAVA_HOME

If it does not return something lets set its value , run this command in another terminal :

/usr/libexec/java_home -v 1.8

the output will look something like :

/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home

copy this and replace the path in command below :

echo 'export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home' >> ~/.bash_profile

open new terminal and run this command to verify if our JAVA_HOME is working

$JAVA_HOME/bin/java -version

It should return your java version (1.8)

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Lets install Maven

brew install maven

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Clone the repository

git clone git@github.com:addu390/dropwizard-elasticsearch-quickstart.git

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IDE Setup

(Suggestion) You can use intelliJ IDEA for development . Download the community edition (free, open source) from this link : https://www.jetbrains.com/idea/download/

After you are done with installation, launch IntelliJ IDE and go to File > Open . Select your dropwizard-elasticsearch-quickstart folder as project location. Build the project using maven. Then for runtime configurations lets set some values.

Go to Run > Edit Configurations , Click on + sign there and select Application . Give it a name and set these values :

• Main class : com.example.application.Application .
• VM Options : -DshouldCreateNewEntitySchema=true .
• Program arguments : server config/local.yml.
• Working directory : path to /dropwizard-elasticsearch-quickstart/quickstart-core.

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After setting Configurations, we need to add Lombok plugin. For setting up Lambok follow these steps :

In intelliJ IDEA, goto Preferences -> Plugins.
Search Lombok in Marketplace Search bar.
Install Lombok plugin by Michail Plushnikov.
Once the plugin get installed, restart the IDE.

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Let's prepare our database

Suggestion : To manage your database, use Sequel Pro, a MySQL management tool designed for macOS. http://www.sequelpro.com/

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Finally Install ElasticSearch

Installation guide: https://www.elastic.co/guide/en/elasticsearch/reference/current/brew.html

For MacOS

$ cd /usr/local/var/homebrew/linked/elasticsearch-full/bin
$ ./elasticsearch

Or to start ES from GUI, follow: https://opensource.com/article/19/7/installing-elasticsearch-macos

Test with GET request to http://localhost:9200

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Done! Start the server 🚀