Hi all! I'm trying to reason about how jruby is interacting in Java 11 with some generated protobuf Java classes. In certain circumstances these generated classes will return a `java.util.Collections$UnmodifiableCollection` for a repeated field. In that case with pure Java in jshell I can still interact with methods of the returned collection (e.g. size), but from jruby 9.2.9.0 this fails like so:

```
jruby-9.2.9.0 :084 > coll
 => #<Java::JavaUtil::Collections::UnmodifiableRandomAccessList:0x38874eb5> 
jruby-9.2.9.0 :085 > coll.size
Traceback (most recent call last):
        6: from .../.rvm/rubies/jruby-9.2.9.0/bin/jirb:13:in `<main>'
        5: from org/jruby/RubyKernel.java:1193:in `catch'
        4: from org/jruby/RubyKernel.java:1193:in `catch'
        3: from org/jruby/RubyKernel.java:1446:in `loop'
        2: from org/jruby/RubyKernel.java:1052:in `eval'
        1: from (irb):85:in `evaluate'
TypeError (illegal access on 'size': class org.jruby.javasupport.JavaMethod (in module org.jruby.dist) cannot access a member of class java.util.Collections$UnmodifiableCollection (in module java.base) with modifiers "public")
```