# Upgrade problem 4.1 - 4.11

**URL:** https://forum.servoy.com/t/upgrade-problem-4-1-4-11/10140
**Category:** Classic Servoy
**Created:** [January 15, 2009, 5:17am UTC](https://forum.servoy.com/t/upgrade-problem-4-1-4-11/10140 "2009-01-15T05:17:05Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![proware](https://avatars.discourse-cdn.com/v4/letter/p/54ee81/32.png) [@proware](https://forum.servoy.com/u/proware)
#### Post date: [January 15, 2009, 5:17am UTC](https://forum.servoy.com/t/upgrade-problem-4-1-4-11/10140/1 "2009-01-15T05:17:05Z")

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I am trying to upgrade Servoy 4.1 to 4.11

I run the following and get this error.

Any ideas?

D:\Program Files\Servoy\>java -jar servoy\_updater.jar  
Exception in thread “main” java.lang.NoClassDefFoundError: com/servoy/j2db/util/  
Utils  
at com.servoy.j2db.develop.cmd.VersionCheck.parseArgs(VersionCheck.java:  
222)  
at com.servoy.j2db.develop.cmd.VersionCheck.main(VersionCheck.java:239)  
Caused by: java.lang.ClassNotFoundException: com.servoy.j2db.util.Utils  
at java.net.URLClassLoader$1.run(Unknown Source)  
at java.security.AccessController.doPrivileged(Native Method)  
at java.net.URLClassLoader.findClass(Unknown Source)  
at java.lang.ClassLoader.loadClass(Unknown Source)  
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)  
at java.lang.ClassLoader.loadClass(Unknown Source)  
at java.lang.ClassLoader.loadClassInternal(Unknown Source)  
… 2 more

Cheers  
David Younger ![:lol:]( "Laughing")

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### Author: ![lvostinar](https://yyz2.discourse-cdn.com/flex010/user_avatar/forum.servoy.com/lvostinar/32/5248_2.png) [@lvostinar](https://forum.servoy.com/u/lvostinar)
#### Post date: [January 15, 2009, 12:27pm UTC](https://forum.servoy.com/t/upgrade-problem-4-1-4-11/10140/2 "2009-01-15T12:27:14Z")

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Maybe you are using an old jar ? (see topic from : [viewtopic.php?f=1&t=11333#p56683](http://forum.servoy.com/viewtopic.php?f=1&t=11333#p56683) ) Try with the jar over there. Or maybe the file structure is changed ( it needs the j2db.jar to be located in ‘application\_server/lib/j2db.jar’ ).