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Dennis wrote ...

2011/3/13

Can't start Greenfoot =(

No_avatar Dennis

2011/3/13

I got the following problem, i just downloaded greenfoot and it always says : "greenfoot failed to launch. For help go to greenfoot.org/programming/support/index.html I already tried to reinstall greenfoot several times, but it didn't help at all. Have a 64-bit, Windows 7 computer and Greenfoot 2.0.1 Would me happy, if anyone can help me ! Greetz
Pinki_thumb egenius

2011/3/13

Does java work on your computer normally?
No_avatar_thumb Dennis

2011/3/13

yes it does, the strangest thing is, greenfoot runs without any problems
Smalldav_thumb davmac

2011/3/15

Maybe do what it says - go to http://greenfoot.org/programming/support/index.html and follow the instructions there. In particular, send us the debug log.
No_avatar den

2012/4/14

I have just got the same error on Ubuntu. The reason was that connections to the local host were not allowed. After altering iptables rules, it started working. In case someone hits the same situation try executing 'iptables -A INPUT -i lo -j ACCEPT' to check if you have the same problem. Keep in mind that command will allow all connections to the local host.
Smalldav davmac

2012/4/15

den, if you specify 'lo' as the interface (as you do) the you are only affecting the loopback interface, which is used for connections between two processes on your machine, but not any real network connections. Your statement that this will 'allow all connections to the local host' isn't accurate. In fact, you should always allow such connections. Firewall setups which don't allow connection on the 'lo' interface are pretty much broken.
No_avatar cgk

2012/5/18

I got the same error message when i tried to start greenfoot 2.2.0 on debian squeeze. where can i find the debug log? There is no entry in /var/log/syslog. cgk
Smalldav_thumb davmac

2012/5/18

~/.greenfoot/greenfoot-debuglog.txt. '~' is your home directory. '.greenfoot' may be hidden.
No_avatar cgk

2012/5/18

Hello davmac, thanks for your fast reply. Here is the log:
Smalldav davmac

2012/5/18

Looks like a Java or Debian bug, similar to http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=573742 (which is supposed to be fixed). You didn't provide the full log so I'm not sure what Java version you're running, but I suggest you try the Oracle JDK if you haven't already. (Otherwise: Is IPv4 not configured on your machine?)
No_avatar cgk

2012/5/18

Hello davemac thanks for your help. I found an explanation in German. See: http://www.rootz.de/2011/02/debian-6-0-squeeze-java-apps-haben-probleme-mit-netzwerkverbindungen/#more-1966 which links to http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560044 it says to do sudo sed -i 's/net.ipv6.bindv6only\ =\ 1/net.ipv6.bindv6only\ =\ 0/' /etc/sysctl.d/bindv6only.conf sudo invoke-rc.d procps restart now greenfoot starts. Just to make it clear: my log starts with
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