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    Using DrawerToggle from support library is quite basic solution. This project is deprecated.

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java.lang.NullPointerException: 	at java.lang.reflect.Method.invoke(java/lang/reflect/Method.java:498)	at org.jruby.javasupport.JavaMethod.invokeDirectWithExceptionHandling(org/jruby/javasupport/JavaMethod.java:438)	at org.jruby.javasupport.JavaMethod.invokeDirect(org/jruby/javasupport/JavaMethod.java:302)	at undefined.RUBY.initialize(/Volumes/Work/SSEA/ADTE/app/classes/greeting.rb:47)	at org.jruby.RubyClass.newInstance(org/jruby/RubyClass.java:994)	at org.jruby.RubyClass$INVOKER$i$newInstance_DBG.call(org/jruby/RubyClass$INVOKER$i$newInstance_DBG.gen)	at undefined.RUBY.create(/Volumes/Work/SSEA/ADTE/app/classes/greeting.rb:59)	at undefined.GreetingActorFactory_1658069735.create(GreetingActorFactory_1658069735.gen:13)	at akka.actor.CreatorConsumer.produce(akka/actor/Props.scala:338)	at akka.actor.Props.newActor(akka/actor/Props.scala:255)	at akka.actor.ActorCell.newActor(akka/actor/ActorCell.scala:552)	at akka.actor.ActorCell.create(akka/actor/ActorCell.scala:578)	at akka.actor.ActorCell.invokeAll$1(akka/actor/ActorCell.scala:456)	at akka.actor.ActorCell.systemInvoke(akka/actor/ActorCell.scala:478)	at akka.dispatch.Mailbox.processAllSystemMessages(akka/dispatch/Mailbox.scala:263)	at akka.dispatch.Mailbox.run(akka/dispatch/Mailbox.scala:219)	at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(akka/dispatch/AbstractDispatcher.scala:397)	at scala.concurrent.forkjoin.ForkJoinTask.doExec(scala/concurrent/forkjoin/ForkJoinTask.java:260)	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(scala/concurrent/forkjoin/ForkJoinPool.java:1339)	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(scala/concurrent/forkjoin/ForkJoinPool.java:1979)	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(scala/concurrent/forkjoin/ForkJoinWorkerThread.java:107)