diff --git a/test.rb b/test.rb
index c74ddc0..ce08f85 100644
--- a/test.rb
+++ b/test.rb
@@ -6,10 +6,11 @@ require 'hadoop-core-1.0.3.jar'

the code below works

java_import 'org.apache.hadoop.conf.Configuration'

p Configuration.new

+p Configuration.new.class_loader

this does not work.

java_import 'ConfigurationApp'
+p ConfigurationApp.java_class.class_loader.to_s
ConfigurationApp.test

applying this patch reveals that ConfigurationApp.class is loaded by a
different classloader then Configuration.

I do no know why the ConfigurationApp is loaded in
sun.misc.Launcher$AppClassLoader and Configuration with the
Thread.currentThread.context_class_loader i.e. the JRubyClassLoader

I tried to put the ConfigurationApp into a jar and also into a package but
it gets always loaded by the AppClassLoader :(

maybe that sounds familiar to someone !

• Kristian

On Mon, Jan 7, 2013 at 6:06 PM, maddosz notifications@github.com wrote:

My environment

java -version
java version "1.7.0_10"
Java(TM) SE Runtime Environment (build 1.7.0_10-b18)
Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode)

jruby -v
jruby 1.7.2 (1.9.3p327) 2013-01-04 302c706 on Java HotSpot(TM) 64-Bit Server VM 1.7.0_10-b18 [darwin-x86_64]

The Bug and how to reproduce it

I encounter a "java.lang.ClassNotFoundException" when calling a simple
java class.
Checkout my repository https://github.com/maddosz/jruby_class_loading_bugto find everything you need. Executing the test.rb yields the following
error

configuration.java:6:in test': java.lang.NoClassDefFoundError: org/apache/hadoop/conf/Configuration from NativeMethodAccessorImpl.java:-2:ininvoke0'
from NativeMethodAccessorImpl.java:57:in invoke' from DelegatingMethodAccessorImpl.java:43:ininvoke'
from Method.java:601:in invoke' from JavaMethod.java:440:ininvokeDirectWithExceptionHandling'
from JavaMethod.java:362:in invokeStaticDirect' from StaticMethodInvoker.java:50:incall'
from CachingCallSite.java:306:in cacheAndCall' from CachingCallSite.java:136:incall'
from test.rb:13:in __file__' from test.rb:-1:inload'
from Ruby.java:810:in runScript' from Ruby.java:803:inrunScript'
from Ruby.java:674:in runNormally' from Ruby.java:523:inrunFromMain'
from Main.java:390:in doRunFromMain' from Main.java:279:ininternalRun'
from Main.java:221:in run' from Main.java:201:inmain'
Caused by:
URLClassLoader.java:366:in run': java.lang.ClassNotFoundException: org.apache.hadoop.conf.Configuration from URLClassLoader.java:355:inrun'
from AccessController.java:-2:in doPrivileged' from URLClassLoader.java:354:infindClass'
from ClassLoader.java:423:in loadClass' from Launcher.java:308:inloadClass'
from ClassLoader.java:356:in loadClass' from configuration.java:6:intest'
from NativeMethodAccessorImpl.java:-2:in invoke0' from NativeMethodAccessorImpl.java:57:ininvoke'
from DelegatingMethodAccessorImpl.java:43:in invoke' from Method.java:601:ininvoke'
from JavaMethod.java:440:in invokeDirectWithExceptionHandling' from JavaMethod.java:362:ininvokeStaticDirect'
from StaticMethodInvoker.java:50:in call' from CachingCallSite.java:306:incacheAndCall'
from CachingCallSite.java:136:in call' from test.rb:13:infile'
from test.rb:-1:in load' from Ruby.java:810:inrunScript'
from Ruby.java:803:in runScript' from Ruby.java:674:inrunNormally'
from Ruby.java:523:in runFromMain' from Main.java:390:indoRunFromMain'
from Main.java:279:in internalRun' from Main.java:221:inrun'
from Main.java:201:in `main'

Any suggestions?

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/484.

if you remove the ConfigurationApp.class file from the working directory the solution with the jar file works fine (at least for me)