Apache Solr Severe Error - solr

Question

Okay, I'm running a single-core Solr setup with Apache Tomcat on webfaction. After some struggles I got Tomcat to recognize Solr, however, when I navigate to the Solr admin, I get this error:
Mar 11, 2014 5:04:22 PM org.apache.solr.common.SolrException log
SEVERE: 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)
at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:1556)
at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:1550)
at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:1583)
at org.apache.solr.core.SolrCore.initWriters(SolrCore.java:1466)
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:556)
at org.apache.solr.core.CoreContainer.create(CoreContainer.java:463)
at org.apache.solr.core.CoreContainer.load(CoreContainer.java:316)
at org.apache.solr.core.CoreContainer.load(CoreContainer.java:207)
at org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:130)
at org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:94)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4809)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5485)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:670)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1839)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:701)
Caused by: java.lang.ClassNotFoundException: solr.VelocityResponseWriter
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:323)
at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:615)
at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:270)
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:373)
... 29 more
I know nothing of Java and have very little experience with Linux, Apache or Tomcat at this level. I've tried searching documentation, but can only find vague references to the VelocityResponseWriter needing to be installed.
Can anyone help point me in the right direction?

Answer 1

Your tomcat app is probably missing these jars:
solr-4.5.0/dist/solr-velocity-4.5.0.jar
solr-4.5.0/contrib/velocity/lib/velocity-1.7.jar
solr-4.5.0/contrib/velocity/lib/velocity-tools-2.0.jar
solr-4.5.0/contrib/velocity/lib/commons-beanutils-1.7.0.jar
solr-4.5.0/contrib/velocity/lib/commons-collections-3.2.1.jar
You can also exclude the VelocityResponseWriter from your solrcofig.xml.
Or you can fix jar inclusions in solrcofig.xml. Try fix these config lines to find the jar files:
<lib dir="../../../contrib/velocity/lib" regex=".*\.jar" />
<lib dir="../../../dist/" regex="solr-velocity-\d.*\.jar" />