Making your Rails app work on Java

Trent — Sat, 26 Sep 2009 12:07:12 +0000

So you’ve written a Rails app and you want to show it off to your boss at work because you know that it will impress them. Problem is that your company only uses Java and won’t consider it for their production environment if it can’t be deployed under a JVM. Let’s go:

Install JRuby http://jruby.org
Install the required gems for Ruby on Rails to work with JRuby

jgem install mongrel activerecord-jdbcsqlite3-adapter rails

Install the gems particular to your application

jruby -S rake gems:install

Update your database.xml file, prefixing your adapter with jdbc

development:
adapter: jdbcsqlite3
database: db/development.sqlite3
pool: 5
timeout: 5000

Start your JVM

jruby script/server

Demonstrate
Sit back and wait for promotion

Some notes on whats going on above:

Detailed installation instructions for JRuby can be found on their wiki: http://kenai.com/projects/jruby/pages/GettingStarted
The jruby -S rake command is very important as the -S switch ensures that the rake command is sourced from the JRuby home, not the system path which would contain a native Ruby install
ActiveRecord-JDBC can handle most any database you can think of in a corporate environment. Check it out here: http://kenai.com/projects/activerecord-jdbc/
If you wish to use another database, there are some gems already pre-packaged, more details on the github page: http://github.com/nicksieger/activerecord-jdbc-adapter

Getting Oracle XE to work with SpringFramework JDBC Template

Trent — Thu, 30 Jul 2009 00:03:48 +0000

Ever get this error when using Oracle XE with SpringFramework JDBC Template?

SORA-12519, TNS:no appropriate service handler found

You can get around it by executing the following commands:

ALTER SYSTEM SET PROCESSES=150 SCOPE=SPFILE;
ALTER SYSTEM SET SESSIONS=100 SCOPE=SPFILE;

Then stop and start database (Oracle XE service) and you’re good to go!

Remember:

needs to be capitals,
needs to have both entries
stop and start the database (oracle XE service)

Got this from the following two resources:

http://en.newinstance.it/2007/06/01/ora-12519-tnsno-appropriate-service-handler-found/
http://forum.springsource.org/showthread.php?p=133267

Pass By Value » jdbc

Making your Rails app work on Java

Getting Oracle XE to work with SpringFramework JDBC Template