The attached simple Swing application results in this stack trace, but the application runs anyway. Exception in thread "AWT-EventQueue-0" hello_swing.jrb:57:in `__jcreate!': wrong # of arguments(2 for 1) (ArgumentError) from hello_swing.jrb:57 ...internal jruby stack elided... from org.jruby.internal.runtime.methods.EvaluateCallable.call(EvaluateCallable.java:58) from org.jruby.runtime.Block.yield(Block.java:217) from org.jruby.runtime.Block.call(Block.java:178) from org.jruby.RubyProc.call(RubyProc.java:166) from org.jruby.RubyProc.call(RubyProc.java:142) from org.jruby.javasupport.proxy.JavaProxyConstructor$1.invoke(JavaProxyConstructor.java:180) from org.jruby.javasupport.proxy.gen.JFrame$Proxy0.invalidate(Unknown Source) from java.awt.Window.dispatchEventImpl(Window.java:1771) from java.awt.Component.dispatchEvent(Component.java:3869) from java.awt.EventQueue.dispatchEvent(EventQueue.java:463) from java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269) from java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190) from java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184) from java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176) from java.awt.EventDispatchThread.run(EventDispatchThread.java:110) Swing$ jruby hello_swing.jrb Exception in thread "AWT-EventQueue-0" hello_swing.jrb:57:in `__jcreate!': wrong # of arguments(2 for 1) (ArgumentError) from hello_swing.jrb:57