Calling JRuby from MATLAB/Octave fails at enumerator library
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Key: JRUBY-4106
URL: http://jira.codehaus.org/browse/JRUBY-4106
Project: JRuby
Issue Type: Bug
Components: Embedding
Affects Versions: JRuby 1.5
Environment: MATLAB R2009b with JVM 1.6 on WinXP;
Octave 3.2.3 with JVM 1.5 on Leopard PPC
Reporter: Ian Dees
Priority: Minor
Fix For: JRuby 1.5
MATLAB and Octave, two environments that can call into Java libraries, both
encounter errors when they try to call into JRuby. Here's a MATLAB interaction
demonstrating the behavior:
{noformat}
>> javaaddpath 'C:\jruby-complete.jar'
>> import org.jruby.Main;
>> jruby = Main();
>> jruby.run('--version');
jruby 1.5.0dev (ruby 1.8.7 patchlevel 174) (2009-10-16 6586) (Java HotSpot(TM)
Client VM 1.6.0_16) [x86-java]
??? Java exception
{noformat}
To log the contents of that exception, I stuck a custom Java class in between
MATLAB and JRuby, and caught a {{NullPointerException}} with the message:
{{library `enumerator' could not be loaded.}}
At first, I suspected a bug in MATLAB, since the equivalent Java code is able
to call into JRuby. But then, see this interaction with Octave on a completely
different platform:
{noformat}
octave-3.2.3:1> pkg load java;
octave-3.2.3:2> java_init;
octave-3.2.3:3> javaaddpath("/Users/username/jruby-complete.jar")
octave-3.2.3:4> java_invoke("org.jruby.Main", "main", {"--version"});
jruby 1.5.0dev (ruby 1.8.7 patchlevel 174) (2009-10-17 6586) (Java HotSpot(TM)
Client VM 1.5.0_20) [ppc-java]
error: [java] org.jruby.exceptions.RaiseException: library `enumerator' could
not be loaded: java.lang.ClassNotFoundException:
org.jruby.libraries.EnumeratorLibrary
{noformat}
Are MATLAB and Octave doing something funky with class loaders? This issue is
an obstacle to extending these environments in JRuby, since the exception
occurs before any extension (using the Ruby-embed APIs) can run.
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