Merge pull request #127 from maximchick/master

warning: ambiguous Java methods found

Author: jdantonio

lib/concurrent/executor/executor.rb

@@ -208,17 +208,19 @@ def kill_execution
 
     module JavaExecutor
       include Executor
+      java_import 'java.lang.Runnable'
 
       # @!macro executor_method_post
       def post(*args)
         raise ArgumentError.new('no block given') unless block_given?
         if running?
-          @executor.submit{ yield(*args) }
+          executor_submit = @executor.java_method(:submit, [Runnable.java_class])
+          executor_submit.call { yield(*args) }
           true
         else
           false
         end
-      rescue Java::JavaUtilConcurrent::RejectedExecutionException => ex
+      rescue Java::JavaUtilConcurrent::RejectedExecutionException
         raise RejectedExecutionError
       end