# Acts\_as\_solr throwing an Exception

**URL:** <https://www.ruby-forum.com/t/acts-as-solr-throwing-an-exception/185212>\
**Category:** Engines\
**Created:** [March 16, 2010, 7:32am UTC](https://www.ruby-forum.com/t/acts-as-solr-throwing-an-exception/185212 "2010-03-16T07:32:41Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![vamsi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/b38774/32.png) [@vamsi](https://www.ruby-forum.com/u/vamsi)\
**Post date:** [March 16, 2010, 7:32am UTC](https://www.ruby-forum.com/t/acts-as-solr-throwing-an-exception/185212/1 "2010-03-16T07:32:41Z")

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Hi,

when i start the rake task for solr

like  
rake solr:start  
i got the following error:

\*\* Invoke solr:start (first\_time)  
\*\* Execute solr:start  
Exception in thread “main” java.lang.NoClassDefFoundError:  
copy/vendor/plugins/acts\_as\_solr/config//////////////solr/development  
Caused by: java.lang.ClassNotFoundException:  
copy.vendor.plugins.acts\_as\_solr.config…solr.development  
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)  
at java.security.AccessController.doPrivileged(Native Method)  
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)  
at java.lang.ClassLoader.loadClass(ClassLoader.java:319)  
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)  
at java.lang.ClassLoader.loadClass(ClassLoader.java:264)  
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332)  
Could not find the main class:  
copy/vendor/plugins/acts\_as\_solr/config/…/…/…/…//solr/development.  
Program will exit.

Can anybody tell me what was the problem and how to over come.