# Servoy Server error - Exception in thread
**URL:** https://forum.servoy.com/t/servoy-server-error-exception-in-thread/8802
**Category:** Classic Servoy
**Created:** [February 26, 2008, 9:06pm UTC](https://forum.servoy.com/t/servoy-server-error-exception-in-thread/8802 "2008-02-26T21:06:29Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Thunder](https://forum.servoy.com/u/Thunder)
#### Post date: [February 26, 2008, 9:06pm UTC](https://forum.servoy.com/t/servoy-server-error-exception-in-thread/8802/1 "2008-02-26T21:06:29Z")
Hi all
I have recently been trying to discover why Servoy will not connect to localhost for mysql (no matter WHAT I do, or which permissions I give mysql or what I try… It is just dead. I have lost two days to this, but that is another story…) While messing with the server, I upgraded from Mac OS X 10.4.10 to 10.4.11 as well as a Mac OS Security update. I did NOT upgrade java to 6 because I can’t face the bugfixing I’d have to do if I did that… Anyway, after upgrading OS X (by one small point which I have done on all my other Servoy Servers) I am getting an error when I try to start servoy server… I get this in terminal:
> servers-computer:/applications/servoy server$ ./servoy\_server.sh &
> [1] 9620
> servers-computer:/applications/servoy server$ Loading servoy.properties from /Applications/Servoy/servoy.properties
> Loading - Done
> Exception in thread “main” java.lang.NoClassDefFoundError: edu/emory/mathcs/backport/java/util/concurrent/ArrayBlockingQueue
> at com.servoy.j2db.util.a.d$c.(Unknown Source)
> at com.servoy.j2db.util.a.d.createServerSocket(Unknown Source)
> at sun.rmi.transport.tcp.TCPEndpoint.newServerSocket(TCPEndpoint.java:622)
> at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:237)
> at sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:184)
> at sun.rmi.transport.tcp.TCPEndpoint.exportObject(TCPEndpoint.java:382)
> at sun.rmi.transport.LiveRef.exportObject(LiveRef.java:116)
> at sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:180)
> at sun.rmi.registry.RegistryImpl.setup(RegistryImpl.java:92)
> at sun.rmi.registry.RegistryImpl.(RegistryImpl.java:78)
> at java.rmi.registry.LocateRegistry.createRegistry(LocateRegistry.java:186)
> at com.servoy.j2db.server.ApplicationServer.a(Unknown Source)
> at com.servoy.j2db.server.ApplicationServer.main(Unknown Source)
> servers-computer:/applications/servoy server$
Servoy Developer works fine on the server machine.
Has anyone got any idea what it means or what I have done wrong? The server is now effectively dead and I am no longer on site, I do have remote access to it, and would desperately like to fix it tonight as the customer’s business grinds to a halt if I don’t…
I also updated Servoy from v. 2.2.7 to 2.2.8.
The Server machine is an Intel Mac Mini running 10.4.11, java 1.5
Any help would be appreciated…
Thanks
Bevil
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### Author:  [@Harjo](https://forum.servoy.com/u/Harjo)
#### Post date: [February 26, 2008, 9:28pm UTC](https://forum.servoy.com/t/servoy-server-error-exception-in-thread/8802/2 "2008-02-26T21:28:44Z")
can’t help you right now, but the same issue is reported here:
[http://forum.servoy.com/viewtopic.php?t … highlight=](http://forum.servoy.com/viewtopic.php?t=10014&highlight=)
did you make a backup first?
than you can roll back to 2.2.7
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### Author:  [@Thunder](https://forum.servoy.com/u/Thunder)
#### Post date: [February 26, 2008, 9:42pm UTC](https://forum.servoy.com/t/servoy-server-error-exception-in-thread/8802/3 "2008-02-26T21:42:01Z")
Hi Harjo
Thank you VERY much for pointing me at this… I would have spent ages trying to find it… This saves me lots of time…
Yes I did back it up before updating… Phew…
Thanks
Bevil
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### Author:  [@Harjo](https://forum.servoy.com/u/Harjo)
#### Post date: [February 26, 2008, 11:18pm UTC](https://forum.servoy.com/t/servoy-server-error-exception-in-thread/8802/4 "2008-02-26T23:18:10Z")
you’re welcome ![:)]( "Smile")
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### Author:  [@rgansevles](https://forum.servoy.com/u/rgansevles)
#### Post date: [February 27, 2008, 1:24pm UTC](https://forum.servoy.com/t/servoy-server-error-exception-in-thread/8802/5 "2008-02-27T13:24:59Z")
See my post on [http://forum.servoy.com/viewtopic.php?t=10014](http://forum.servoy.com/viewtopic.php?t=10014)
Rob