I have setup an Apache Tomcat 6 server and installed Apache Solr 3.5.0 as per instructions found here http://pabloseminario.com/2011/02/22/installing-solr-on-debian-6-0/.
Now, opening the solr application in a browser yields the following error:
HTTP Status 500 - Severe errors in solr configuration. Check your log files for more detailed information on what may be wrong. If you want solr to continue after configuration errors, change: <abortOnConfigurationError>false</abortOnConfigurationError> in solr.xml
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org.apache.solr.common.SolrException: Error loading class 'solr.VelocityResponseWriter'
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:389)
at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:425)
at org.apache.solr.core.SolrCore.createInitInstance(SolrCore.java:447)
My installation is currently open to the public for test purposes:
http://62.75.247.116:8080/solr/
I'm running this on a Debian 6 machine.
I did some Googling, but there is little to no documentation or anything regarding this, for Solr 3.5; most information is for 1.4 and doesn't apply to 3.5.
Note: I have no previous experience in neither Tomcat nor Solr.
Best Answer
I ran into this same issue on RHEL 5.3 with Tomcat 7 and solr 3.5. I just disabled the query response writer velocity inside the solrconfig file. But if you need to use velocity, which i don't, it appears that you'll need to drop some files into the lib folder.