Solr initialization failure: requesthandler INIT failure

The above error reports refer to initialization failure
The following questions need to be checked
1. Add to solrconfig.xml In the middle of the day , If it's handwritten , Then you can check it , It is possible that there is a wrong field here , Maybe replace my copy here

<requestHandler name="/dataimport"
		class="org.apache.solr.handler.dataimport.DataImportHandler">
		<lst name="defaults">
			<str name="config">data-config.xml</str>
		</lst>
</requestHandler>

2. The above problems have not been solved yet , Will be mysql-connector-java.jar Whether this package has been copied to tomcat Under the lib

3. It hasn't been solved yet
solr-dataimporthandler-x.x.x.jar and solr-dataimporthandler-extras-x.x.x.jar Whether the two packages are copied to tomcat Under the lib or solr Under the project , I put it on solr Under the project of

Usually the above questions are confirmed to be OK , restart tomcat that will do

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