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Asked: 2026-06-04T19:14:28+00:00

I’m trying to use a method from a Java class whose parameter type is

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I’m trying to use a method from a Java class whose parameter type is char, but I can’t seem to get it to work. If I try constructing a new instance of java.lang.Character, it throws the error:

org.jruby.exceptions.RaiseException: (TypeError) cannot convert instance of class org.jruby.java.proxies.ConcreteJavaProxy to char
...[stacktrace; not important]...

When I try to create a new instance of Java::char using Java::char.java_class.new(my_number), it raises java.lang.StackOverflowError. Well, in the jirb, it gives me this:

NoMethodError: undefined method `new' for class char:Java::JavaClass

or if I use Java::char.to_java.new(my_number), it gives the error:

NoMethodError: undefined method `new' for #<Class:0x1556b277f>

I’m really stuck on what to do; all I need is to get a java character somehow that can be passed through the type system successfully. Any ideas?

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1 Answer

  1. Editorial Team

    Figured it out; apparently Jruby will coerce Ruby Fixnums into Java Characters if needed. Problem solved.

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