title: Error when start Solr cloud, due to location of 3rd party libraries
body: <p>I tried to migrate to Solr 3.1 , my project uses Dataimport handler ,
  when I started solr it asked me SolrCoreAwar not found I copied the following file to lib directory
  apache-solr-dataimporthandler-3.1-SNAPSHOT.jar 
  but again an error appeared when stating solr
  I need to fix this problem , if you can help
  Thank You </p>
  
  <p>The next message is the exception I get When Starting Solr 3.1</p>
  
  <pre><code> java.lang.NoClassDefFoundError: Could not initialize class org.slf4j.LoggerFactory
      at org.apache.solr.handler.dataimport.DataImportHandler.&lt;clinit&gt;(DataImportHandler.java:72)
      at java.lang.Class.forName0(Native Method)
      at java.lang.Class.forName(Class.java:264)
      at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:373)
      at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:423)
      at org.apache.solr.core.SolrCore.createRequestHandler(SolrCore.java:459)
      at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:154)
      at org.apache.solr.core.SolrCore.&lt;init&gt;(SolrCore.java:563)
      at org.apache.solr.core.CoreContainer.create(CoreContainer.java:458)
      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.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
      at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:713)
      at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
      at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)
      at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
      at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)
      at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
      at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)
      at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
      at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
      at org.mortbay.jetty.Server.doStart(Server.java:224)
      at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      at org.mortbay.xml.XmlConfiguration.main(XmlConfiguration.java:985)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:616)
      at org.mortbay.start.Main.invokeMain(Main.java:194)
      at org.mortbay.start.Main.start(Main.java:534)
      at org.mortbay.start.Main.start(Main.java:441)
      at org.mortbay.start.Main.main(Main.java:119
  </code></pre>
  
  <p><strong>Update</strong></p>
  
  <p>I've added the following jar files to my class path , the previous exception disappeared , but  a new Error appeared when starting solr server :</p>
  
  <pre><code> Error Instantiating Request Handler, org.apache.solr.handler.dataimport.DataImportHandler is not a org.apache.solr.request.SolrRequestHandler
      at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:425)
      at org.apache.solr.core.SolrCore.createRequestHandler(SolrCore.java:459)
      at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:154)
      at org.apache.solr.core.SolrCore.&lt;init&gt;(SolrCore.java:563)
      at org.apache.solr.core.CoreContainer.create(CoreContainer.java:458)
      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.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
      at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:713)
      at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
      at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)
      at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
      at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)
      at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
      at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)
      at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
      at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
      at org.mortbay.jetty.Server.doStart(Server.java:224)
      at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
          at org.mortbay.xml.XmlConfiguration.main(XmlConfiguration.java:985)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:616)
      at org.mortbay.start.Main.invokeMain(Main.java:194)
      at org.mortbay.start.Main.start(Main.java:534)
      at org.mortbay.start.Main.start(Main.java:441)
      at org.mortbay.start.Main.main(Main.java:119)
  </code></pre>