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Asked: 2026-05-16T06:52:44+00:00

I’m trying to port some java to jruby, and it uses a beans PropertyDescriptor.

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I’m trying to port some java to jruby, and it uses a beans PropertyDescriptor. The original code is:

new PropertyDescriptor("splitEvaluator", CrossValidationResultProducer.class)

which I’ve tried to port to:

PropertyDescriptor.new("splitEvaluator", CrossValidationResultProducer)

However, I get the error:

no constructor with arguments matching [class org.jruby.RubyString, class org.jruby.RubyClass] on object #<Java::JavaBeans::PropertyDescriptor:0x86f847> (NameError)

The PropertyDescriptor API says the second argument should be a Java Class. What do I need to pass for this to work in JRuby?

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1 Answer

  1. Editorial Team

    I can see an argument that it’s a bug that it doesn’t work the way you originally expected. Or at least that JRuby would be smart enough to convert a Ruby class representation of a Java class to a Java class argument.

    As it is, using #java_class works, as you found out.

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