# Jruby, JDBC

**URL:** <https://www.ruby-forum.com/t/jruby-jdbc/98917>\
**Category:** Ruby\
**Created:** [July 19, 2006, 12:18am UTC](https://www.ruby-forum.com/t/jruby-jdbc/98917 "2006-07-19T00:18:11Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\
**Post date:** [July 19, 2006, 12:18am UTC](https://www.ruby-forum.com/t/jruby-jdbc/98917/1 "2006-07-19T00:18:11Z")

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Howdy-  
I’m trying to build a simple connection to Oracle using JRuby. I’m a  
JRuby newbie, so my method may be quite flawed. But I cannot seem to  
get JRuby to recognize jars in the classpath (demonstration below). I  
wonder if anyone can see what I’m doing wrong?

$ jar -tf lib/classes12.jar | grep OracleDriver  
oracle/jdbc/driver/OracleDriver.class  
oracle/jdbc/OracleDriver.class  
$ java -classpath “./lib/classes12.jar” -jar  
/usr/local/jruby/lib/jruby.jar  
require ‘java’  
include\_class ‘oracle.jdbc.driver.OracleDriver’  
puts ‘hi’

C:\jruby\src\builtin\javasupport.rb:258:in `for_name': cannot load Java class oracle.jdbc.driver.OracleDriver (NameError) from C:\jruby\src\builtin\javasupport.rb:258:in`get\_proxy\_class’  
from (eval):0:in `include_class' from -:2:in`each’  
from C:\jruby\src\builtin\javasupport.rb:405:in `include\_class’  
from -:2

$ cat conn\_test.java  
import oracle.jdbc.driver.OracleDriver;  
class conn\_test {  
public static void main (String[] args) {  
System.out.println(“Hi”);  
}  
}  
$ javac -classpath “lib/classes12.jar” conn\_test.java  
$ java -classpath “.:lib/classes12.jar” conn\_test  
Hi

Thanks.  
-J

---

<div class="post-metadata">

**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\
**Post date:** [July 19, 2006, 12:50am UTC](https://www.ruby-forum.com/t/jruby-jdbc/98917/2 "2006-07-19T00:50:02Z")

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On Wed, 19 Jul 2006, removed\_email\_address@domain.invalid defenestrated me:

> $ java -classpath “./lib/classes12.jar” -jar  
> /usr/local/jruby/lib/jruby.jar

Mixing -classpath and -jar is not allowed in Java. I recommend  
using one of the wrapper scripts in ./bin in the jruby distribution:

CLASSPATH=lib/classes12.jar ./bin/jruby some\_script

Any followup Java-specific JRuby questions should be done on our  
jruby-user and jruby-devel mailing lists on sourceforge (though  
in a very short time we will be moving to codehaus).

-Tom

PS- You may be the first person to try using the JDBC active record  
adapter with Oracle. Report to our lists with any progress you make.