TEMP: Add debug output for JRuby adapter

.travis.yml

@@ -13,6 +13,10 @@ matrix:
         # TODO: 0.8 is enough on Linux, but 2 seems needed for Travis/OSX
         - LISTEN_TESTS_DEFAULT_LAG=2
     - rvm: jruby
+      env:
+        - LISTEN_TESTS_DEFAULT_LAG=10
+        - TEST_LISTEN_ADAPTER_MODES=native
+        - LISTEN_GEM_DEBUGGING=2
     - rvm: truffleruby
     - rvm: jruby-head
     - rvm: ruby-head

lib/listen/adapter.rb

@@ -17,7 +17,11 @@ def select(options = {})
         _log :debug, 'Adapter: considering polling ...'
         return Polling if options[:force_polling]
         _log :debug, 'Adapter: considering optimized backend...'
-        return _usable_adapter_class if _usable_adapter_class
+        _log :debug, "Adapter: RUBY_ENGINE=#{RUBY_ENGINE}"
+        if _usable_adapter_class
+          _log :debug, "Adapter: using #{_usable_adapter_class}"
+          return _usable_adapter_class
+        end
         _log :debug, 'Adapter: falling back to polling...'
         _warn_polling_fallback(options)
         Polling

lib/listen/adapter/jruby.rb

@@ -21,6 +21,7 @@ def _configure(directory, &_callback)
         ]
 
         @watcher ||= FileSystems.getDefault.newWatchService
+        p @watcher.class.name
         @keys ||= {}
         path = Paths.get(directory.to_s)
         key = path.register(@watcher, *event_kinds)