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From Josh Harrison <joshharri...@coraxcyber.com>
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
purposes. 

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 

Error: 

NameError: cannot load Java class org.apache.phoenix.jdbc.PhoenixDriver
                                for_name at org/jruby/javasupport/JavaClass.java:1286
                         get_proxy_class at org/jruby/javasupport/JavaUtilities.java:34
                             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: 

activerecord-jdbc-adapter
jdbc-mysql


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, 
Josh






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