[jRuby] CLASSPATH problem?

ruby-talk
1

today I've switch from jruby-1.1.RC3 to jruby-1.1.3

I'm using to jdbc connectors, installed by gem :
jdbc-mysql-5.0.4
jdbc-sqlite3-3.5.8

I've set my CLASSPATH to :
export
CLASSPATH=".:/opt/jruby-1.1.3/lib/ruby/gems/1.8/gems/jdbc-sqlite3-3.5.8/
lib/sqlite-3.5.8.jar:/opt/jruby-1.1.3/lib/ruby/gems/1.8/gems/jdbc-mysql-
5.0.4/lib/mysql-connector-java-5.0.4-bin.jar"

If i echo the "--classpath" of /opt/jruby-1.1.3/bin/jruby, i get :

From jruby : -classpath =
/opt/jruby/lib/bsf.jar:/opt/jruby/lib/jruby.jar:/opt/jruby/lib/profile.j
ar:.:/opt/jruby-1.1.3/lib/ruby/gems/1.8/gems/jdbc-sqlite3-3.5.8/lib/sqli
te-3.5.8.jar:/opt/jruby-1.1.3/lib/ruby/gems/1.8/gems/jdbc-mysql-5.0.4/li
b/mysql-connector-java-5.0.4-bin.jar

seems OK

but with :
require 'java'
require 'rubygems'
require 'jdbc/sqlite3'
module JavaLang
  include_package "java.lang"
end

module JavaSql
  include_package 'java.sql'
end

puts "ENV['CLASSPATH'] = #{ENV['CLASSPATH']}"

begin
  JavaLang::Class.forName("org.sqlite.JDBC").newInstance
[...]
rescue JavaLang::ClassNotFoundException
  puts "ClassNotFoundException"
rescue JavaSql::SQLException
  puts "SQLException"
end

i get allways "ClassNotFoundException"

I've even verified (jar tf /path/to/file.jar) the Class
"org.sqlite.JDBC" is in.

also reading "sqlite3.rb" gives :

$ cat
/opt/jruby-1.1.3/lib/ruby/gems/1.8/gems/jdbc-sqlite3-3.5.8/lib/jdbc/sqli
te3.rb
module Jdbc
  module SQLite3
    VERSION = "3.5.8"
  end
end
if RUBY_PLATFORM =~ /java/
  require "sqlite-#{Jdbc::SQLite3::VERSION}.jar"
else
  warn "jdbc-SQLite3 is only for use with JRuby"
end%

is the latest require "sqlite-#{Jdbc::SQLite3::VERSION}.jar" usefull ?

it seems, to me, it has no effect...

···

--
Une Bévue

2

Une Bévue wrote:

begin
  JavaLang::Class.forName("org.sqlite.JDBC").newInstance
[...]
rescue JavaLang::ClassNotFoundException
  puts "ClassNotFoundException"
rescue JavaSql::SQLException
  puts "SQLException"
end

i get allways "ClassNotFoundException"

The problem here is the Class.forName call. Class.forName will try to use the system classloader if nothing else is specified. Since the system classloader doesn't allow pulling in new JAR files after startup, we have a separate sub-classloader for JRuby.

If you want to load the class, just reference it directly or try to import it.

require 'jdbc/sqlite3'
org.sqlite.JDBC # or import 'org.sqlite.JDBC'

This will use the JRuby classloader which knows about the loaded JAR file. I tried this, and it works fine for me here.

➔ jruby -e "require 'rubygems'; require 'jdbc/sqlite3'; p org.sqlite.JDBC"
Java::OrgSqlite::JDBC

- Charlie

3

OK, I'll try that, but, if i remember well, the same script was working
with 1.1.RC3 and not with 1.1.3.

···

Charles Oliver Nutter <charles.nutter@sun.com> wrote:

The problem here is the Class.forName call. Class.forName will try to
use the system classloader if nothing else is specified. Since the
system classloader doesn't allow pulling in new JAR files after startup,
we have a separate sub-classloader for JRuby.

If you want to load the class, just reference it directly or try to
import it.

require 'jdbc/sqlite3'
org.sqlite.JDBC # or import 'org.sqlite.JDBC'

This will use the JRuby classloader which knows about the loaded JAR
file. I tried this, and it works fine for me here.

? jruby -e "require 'rubygems'; require 'jdbc/sqlite3'; p org.sqlite.JDBC"
Java::OrgSqlite::JDBC

--
Une Bévue