Re: [jruby-user] java.lang.invoke.SwitchPoint problem when using invokedynamic

Isn't it because invokeddynamic is available for JDK8 and not JDK7?

If you've the possibility to upgrade to JDK 1.8.0_11 and report back, you
might see a different behavior.


On Tue, Aug 19, 2014 at 9:08 PM, O. L. <[email protected]> wrote:

> I'm using JRuby 1.7.13 and Java 7 to perform this task. Firstly, I use
> "jrubyc" to compile a simple HelloWorld program into a Java class file
> "hello.class". Next, I download the jruby library
> "jruby-complete-1.7.13.jar" and execute the following command:
>
>  java -cp .:jruby-complete-1.7.13.jar hello
>
> In the case when I disable the invokedynamic when doing the jrubyc, this
> above command executes smoothly and prints out "hello, world!" without
> problems. But if invokedynamic is enabled, the following exception
> occurs:
>
> Exception in thread "main" java.lang.ClassCastException:
> java.lang.Integer cannot be cast to java.lang.invoke.SwitchPoint
>
> at
>
> org.jruby.runtime.invokedynamic.InvocationLinker.invocationFallback(InvocationLinker.java:130)
>
> at hello.__file__(hello.rb:10)
>
>
> I'm wondering what this "SwitchPoint" is and why it is causing problems.
> I'm scanning through the jruby properties and see the following two
> parameters that might be relevant:
>
> #invokedynamic.invocation.java=true
> #invokedynamic.invocation.switchpoint=true
>
> But I've tried various ways attempting to change the value of these two
> parameters but couldn't manage to do it. I'm also not sure if this is
> the correct way of fixing the above exception.
>
> If anyone encounters this, please let me know how you work around with
> it. I'm sure there're people who try to compile a Ruby file with the
> latest JRuby version.
>
> --
> Posted via http://www.ruby-forum.com/.
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-- 
Christian