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Everytime I try to use installed greenfoot, for example if I want to create a new Project, Open an old one, try to compile ... Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at sun.awt.shell.Win32ShellFolder2.getFileSystemPath(Win32ShellFolder2.java:571) at sun.awt.shell.Win32ShellFolder2.access$400(Win32ShellFolder2.java:72) at sun.awt.shell.Win32ShellFolder2$2.call(Win32ShellFolder2.java:298) at sun.awt.shell.Win32ShellFolder2$2.call(Win32ShellFolder2.java:296) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at sun.awt.shell.Win32ShellFolderManager2$ComInvoker$3.run(Win32ShellFolderManager2.java:547) at java.lang.Thread.run(Thread.java:745) So i can not do anything :( I am using Win 7, Greenfoot 3.0.4, Java 1.8.0_112 installed (just both new downloaded and installed) and it doesn't work Debuglogfile: Greenfoot run started: Wed Nov 09 11:54:37 CET 2016 Greenfoot version: 3.0.4 Java version 1.8.0_112 Virtual machine: Java HotSpot(TM) 64-Bit Server VM 25.112-b15 (Oracle Corporation) Running on: Windows 7 6.1 (amd64) Java Home: D:\Programme\Java\jdk1.8.0_112\jre ---- Opening project: D:\Programme\Greenfoot\lib\greenfoot\startupProject 1478688881892: Listening for JDWP connection on address: javadebug Connected to debug VM via dt_shmem transport... Communication with debug VM fully established. I tried the portable Version - and again, it does not work: java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is: java.net.ConnectException: Connection refused: connect at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:619) at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216) at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202) at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:130) at rmiextension.wrappers.RBlueJImpl_Stub.getOpenProjects(Unknown Source) at rmiextension.BlueJRMIClient.initialise(BlueJRMIClient.java:85) at greenfoot.core.GreenfootLauncherDebugVM$1.run(GreenfootLauncherDebugVM.java:81) Caused by: java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at java.net.Socket.connect(Socket.java:538) at java.net.Socket.<init>(Socket.java:434) at java.net.Socket.<init>(Socket.java:211) at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40) at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:148) at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613) ... 6 more java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is: java.net.ConnectException: Connection refused: connect at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:619) at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216) at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202) at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:130) at rmiextension.wrappers.RBlueJImpl_Stub.getSystemLibDir(Unknown Source) at greenfoot.core.GreenfootLauncherDebugVM$1.run(GreenfootLauncherDebugVM.java:82) Caused by: java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at java.net.Socket.connect(Socket.java:538) at java.net.Socket.<init>(Socket.java:434) at java.net.Socket.<init>(Socket.java:211) at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40) at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:148) at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613) ... 5 more =============== Any idea how to get at least 1 working? (Both fresh downloaded today, include java)

In the piano-case from the Greenfoot book chapter 5 (1st edition, in Dutch), it would be normally be wiser to instantiate a GreenfootSound object once, reading the wav-file just once as in sound = new GreenfootSound("3a.wav") and then playing the sound as much as desired with sound.play() opposed to executing Greenfoot.playSound("3a.wav") over and over again. But, in fact, it seams that exactly the opposite is true: Greenfoot.playSound("3a.wav") performs clearly better than sound.play(). This is counter-intuitive! How come?