Solr 4 Data Import Handler doesn't work

I am deploying Solr 4.3.0 in Tomcat 7. Everything works fine but DataImportHandler. I can go to the

http://localhost:8080/solr/#/collection1/dataimport//dataimport

screen and see the dataimport options load at the UI.

Still, I can see any of my entities load in the "entity" combo box. Inside the configuration box, at the right side I can see the error below.

Apache Tomcat/7.0.41 - Error report

525D76;}--> HTTP Status 500 - Filter execution threw an exception

noshade="noshade">

type Exception report

message Filter execution threw an exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Filter execution threw an
exception

root cause

java.lang.NoClassDefFoundError: org/apache/log4j/spi/LoggingEvent
  org.apache.solr.logging.log4j.EventAppender.append(EventAppender.java:35)
  org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)
  org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:66)
  org.apache.log4j.Category.callAppenders(Category.java:206)
  org.apache.log4j.Category.forcedLog(Category.java:391)
  org.apache.log4j.Category.log(Category.java:856)
  org.slf4j.impl.Log4jLoggerAdapter.error(Log4jLoggerAdapter.java:498)
  org.apache.solr.common.SolrException.log(SolrException.java:119)
  org.apache.solr.servlet.ResponseUtils.getErrorInfo(ResponseUtils.java:58)
  org.apache.solr.servlet.SolrDispatchFilter.sendError(SolrDispatchFilter.java:691)
  org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:380)
  org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:155)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.41 logs.

Apache Tomcat/7.0.41

Problem is that I have the "log4j-1.2.16.jar" loaded in the classpath (it's on Tomcat lib dir).

Anyone have stepped in this problem?

Solution

Try following the steps outlined in Using the example logging setup in containers other than Jetty. I have encountered this same error when running Solr 4.3 until I followed these steps to configure logging.