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

> what you're trying to achieve is "best" done using:
*>     klass.java_class.to_java.getDeclaredFields[0].generic_type*

Ah yes, great. I'm familiar with to_java(), but thought that in this case
it was redundant. So java_class() returns the JRuby "java class" while
to_java() gives you the actual java class?

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

I don't use StackOverflow much and http://jruby.org/community didn't
mention it.

Thanks for your help. 


2014-07-09 10:09 GMT-04:00 Karol Bucek <[email protected]>:

>
> 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
>>
>
>