title: http error 404 for SOLR
body: <p>Hello I am using SOLR (version 7.0.0) when start server , we got this error. How to fix it?</p>
  
  <pre><code>HTTP ERROR 404
  </code></pre>
  
  <p>Problem accessing /solr/. Reason:</p>
  
  <pre><code>Not Found
  </code></pre>
  
  <p>Caused by:
  javax.servlet.UnavailableException: Error processing the request. CoreContainer is either not initialized or shutting down.
      at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:338)
      at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:322)
      at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1691)
      at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)
      at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
      at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
      at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
      at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
      at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
      at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
      at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
      at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
      at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
      at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)
      at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
      at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)
      at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
      at org.eclipse.jetty.server.Server.handle(Server.java:534)
      at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
      at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
      at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
      at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
      at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
      at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
      at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
      at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
      at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
      at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
      at java.lang.Thread.run(Thread.java:748)</p>