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From Josh Harrison <>
Subject JRuby on rails -> Phoenix connection error - cannot load java class
Date Wed, 02 Dec 2015 19:35:45 GMT
Hi Guys, 

We’re trying to spin up a testing version of Phoenix and integrate it with a Jruby on rails
application. I have Phoenix and Hbase successfully installed, configured and talking to each
other, but am coming up with a ‘cannot load java class’ error when trying to make the
connection to the rails server. I’m running this in standalone mode by the way for testing

The correct phoenix-server jars in are the classpath for the application. 

Any help or guidance you can give on the the connection would be greatly appreciated. 

Phoenix:  4.6
HBase:  1.1.2
JRuby: 1.7.19 


NameError: cannot load Java class org.apache.phoenix.jdbc.PhoenixDriver
                                for_name at org/jruby/javasupport/
                         get_proxy_class at org/jruby/javasupport/
                             java_import at file:/usr/local/rvm/rubies/jruby-1.7.19/lib/jruby.jar!/jruby/java/core_ext/object.rb:27


Here’s my jdbc.rb connector: 

require 'java'
java_import 'org.apache.phoenix.jdbc.PhoenixDriver'

java_import 'java.sql.Connection'
java_import 'java.sql.DriverManager'
java_import 'java.sql.ResultSet'
java_import 'java.sql.SQLException'
java_import 'java.sql.PreparedStatement'
java_import 'java.sql.Statement'

Java::JavaClass.for_name "org.apache.phoenix.jdbc.PhoenixDriver"
Connection con = DriverManager.getConnection("jdbc:phoenix://localhost:2181”)

Related Gems in Gemfile: 


More generally do you have many examples or use cases of OLTP rails applications connecting
to phoenix, as most examples I’ve found seem to be Java applications?

Many Thanks, 


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