https://git.ruby-lang.org/ruby.git/commit/?id=54839f0173

From 54839f01736a8827be64c7f1720d226d37fa17d3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Rodr=C3=ADguez?= <deivid.rodriguez@r...>
Date: Thu, 12 Sep 2019 10:19:11 +0200
Subject: [rubygems/rubygems] Fix jruby build

https://github.com/rubygems/rubygems/commit/cc255b774a

diff --git a/lib/rubygems/core_ext/kernel_warn.rb b/lib/rubygems/core_ext/kernel_warn.rb
index 6c5b387..a1dd8ad 100755
--- a/lib/rubygems/core_ext/kernel_warn.rb
+++ b/lib/rubygems/core_ext/kernel_warn.rb
@@ -14,7 +14,11 @@ if RUBY_VERSION >= "2.5" https://github.com/ruby/ruby/blob/trunk/lib/rubygems/core_ext/kernel_warn.rb#L14
 
     module_function define_method(:warn) {|*messages, **kw|
       unless uplevel = kw[:uplevel]
-        return original_warn.call(*messages, **kw)
+        if Gem.java_platform?
+          return original_warn.call(*messages)
+        else
+          return original_warn.call(*messages, **kw)
+        end
       end
 
       # Ensure `uplevel` fits a `long`
-- 
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