#285 ClassCastException retrieving default value from ThreadLocal in JRuby

[Charles Oliver Nutter]

When booting JRuby 1.7, I get the following ClassCastException:

system ~/projects/jruby-1.7 $ mono ~/Downloads/ikvm/bin/ikvm.exe -Djruby.home=`pwd` -jar lib/jruby.jar -d -e "puts 'hello'"
java.lang.ClassCastException: Cannot cast from source type to destination type.
    at org.joni.StackMachine.fetchStack(StackMachine.java:77)
    at org.joni.StackMachine.<init>(StackMachine.java:44)
    at org.joni.ByteCodeMachine.<init>(ByteCodeMachine.java:55)
    at org.joni.MatcherFactory$1.create(MatcherFactory.java:28)
    at org.joni.Regex.matcher(Regex.java:172)
    at org.jruby.lexer.yacc.RubyYaccLexer.handleFileEncodingComment(RubyYaccLexer.java:827)

I'm not sure how to get Maven to run tests using ikvm, but I suspect the Joni tests would fail in a similar way.

The code that fails is here: https://github.com/jruby/joni/blob/master/src/org/joni/StackMachine.java#L77

Seems like it might be a bug in ThreadLocal, since a few lines above this it seems to be allocating the right type of value. It's not clear why the implicit cast fails at this line.

[Jeroen Frijters]

This is probably a Mono bug. I have JRuby 1.7.0 running fine on the .NET Framework.

[Charles Oliver Nutter]

Interesting. Unfortunately that dies limit my ability to get and keep JRuby
running on ikvm. What are my chances of getting a Mono bug fixed?

• Charlie (mobile)
  On Feb 14, 2014 1:29 AM, "Jeroen Frijters" jfrijters@users.sf.net wrote:

This is probably a Mono bug. I have JRuby 1.7.0 running fine on the .NET
Framework.

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• [bugs:#285] http://sourceforge.net/p/ikvm/bugs/285/ ClassCastException
  retrieving default value from ThreadLocal in JRuby*

Status: open
Created: Fri Feb 14, 2014 02:32 AM UTC by Charles Oliver Nutter
Last Updated: Fri Feb 14, 2014 02:32 AM UTC
Owner: nobody

When booting JRuby 1.7, I get the following ClassCastException:

system ~/projects/jruby-1.7 $ mono ~/Downloads/ikvm/bin/ikvm.exe -Djruby.home=pwd -jar lib/jruby.jar -d -e "puts 'hello'"java.lang.ClassCastException: Cannot cast from source type to destination type.
at org.joni.StackMachine.fetchStack(StackMachine.java:77)
at org.joni.StackMachine.<init>(StackMachine.java:44)
at org.joni.ByteCodeMachine.<init>(ByteCodeMachine.java:55)
at org.joni.MatcherFactory$1.create(MatcherFactory.java:28)
at org.joni.Regex.matcher(Regex.java:172)
at org.jruby.lexer.yacc.RubyYaccLexer.handleFileEncodingComment(RubyYaccLexer.java:827)

I'm not sure how to get Maven to run tests using ikvm, but I suspect the
Joni tests would fail in a similar way.

The code that fails is here:
https://github.com/jruby/joni/blob/master/src/org/joni/StackMachine.java#L77

Seems like it might be a bug in ThreadLocal, since a few lines above this
it seems to be allocating the right type of value. It's not clear why the
implicit cast fails at this line.

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[Jeroen Frijters]

I honestly don't know, but I suspect that unless someone takes the time to boil it down to a small C# repro, they won't bother investigating it (and I can't blame them).

BTW, what versions of Mono and IKVM did you use?

[Charles Oliver Nutter]

Latest release downloads of both.