Running jruby application with Elastic Search gem.

Question

I'm trying to generate a compiled application of the Rails project using jruby and host it on Tomcat server. I'm struggling to establish the connection with elasticsearch after compiling.

Following are the steps I've taken:

• Installed Jruby-9.2.0.0
• Created a jruby on rails application

• Gemfile contains

  gem 'rails', '~> 5.2.1' gem 'listen' gem 'activerecord-jdbcmysql-adapter' gem 'therubyrhino' gem 'java' gem 'ruby-debug', '~> 0.10.6' gem 'elasticsearch' gem 'warbler'

• warble.conf contains

  Warbler::Config.new do |config| config.features = %w(FEATURE) config.features = %w(gemjar) end

• Controller contains:

  def index $es_client = Elasticsearch::Client.new log: true products = $es_client.search index: 'production-products' render json: products end

• Ran warble compiled war command in the project folder to create .war file

When I run the application directly using rails s it is working as expected.

But when I compile the application and run on Tomcat server I'm getting the following error

Internal Server Error (500)
Request Method:     GET
Request URL:    http://localhost:8080/blog/
java.lang.NullPointerException
You're seeing this error because you use    JRuby::Rack::ErrorApp::ShowStatus.

Answer 1

The solution is to include the required gem in warble.conf file.

Warbler::Config.new do |config|
  config.features = %w(FEATURE)
  config.features = %w(gemjar)
  config.gems["elasticsearch"]
end+