Re: [jruby-user] Re: Differences Between MyClass.class and getClass() in JRuby

reflection is a bit "non-trivial" but there's some logic involved (it is
mostly due supporting the Ruby side of Java).
what you're trying to achieve is "best" done using :

*    klass.java_class.to_java.getDeclaredFields[0].generic_type*

you got the *klass.java_class *right but *declared_fiels* is still a helper
from JRuby and returns a

*Java::JavaField*
p.s. questions such as these might be beneficial for others, maybe next
time try asking at http://stackoverflow.com/questions/tagged/jruby


On Tue, Jul 8, 2014 at 6:03 AM, s shaw <[email protected]> wrote:

> > I’m getting the expected result.
>
> That's because inspect is calling toString() which outputs "class ...".
> If you look at the ruby class you can see the difference:
>
> ~ >cat /tmp/reflect.rb
> klass = java.lang.String
> p klass.new.get_class.class
> p klass.java_class.class
> p klass.new.get_class.declared_fields[0].generic_type
> p klass.java_class.declared_fields[0].generic_type
> ~ >ruby -v !!:$
> ruby -v /tmp/reflect.rb
> jruby 1.7.12 (1.9.3p392) 2014-06-20 643e292 on Java HotSpot(TM) 64-Bit
> Server VM 1.6.0_65-b14-462-11M4609 [darwin-x86_64]
> Java::JavaLang::Class
> Java::JavaClass
> class [C
> NoMethodError: undefined method `generic_type' for private final char[]
> java.lang.String.value:Java::JavaField
>   (root) at /tmp/reflect.rb:5
>