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https://issues.apache.org/jira/browse/SOLR-14236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jenny Qiu resolved SOLR-14236.
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Resolution: Fixed
> 【solr】 A "org.apache.log4j.ConsoleAppender" object is not assignable to a
> "org.apache.log4j.Appender" variable.
> ---------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-14236
> URL: https://issues.apache.org/jira/browse/SOLR-14236
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Server, SolrJ
> Affects Versions: 4.10.1
> Reporter: Jenny Qiu
> Priority: Minor
> Labels: solr, tomcat
> Attachments: 微信截图_20200203224606.png
>
>
>
> I have built the solr project through tomcat, but when I run the startup.bat
> it tells me this:
> {code:java}
> log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not assignable to
> a "org.apache.log4j.Appender" variable.
> log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
> log4j:ERROR [org.powermock.core.classloader.MockClassLoader@16a40b2] whereas
> object of type
> {code}
> I searched for many solutions online, but none works.
>
> Then I thought maybe things went wrong with the files related to log4j, then
> I deleted the *log4j-1.2.17.jar* in
> _D:\FSP_20160630\apache-tomcat-8_0_9-solr4_10_1\webapps\solr\WEB-INF\lib_
> because I can find exact {color:#FF0000}same{color} ones in
> _D:\FSP_20160630\apache-tomcat-8_0_9-solr4_10_1\lib_
> _!微信截图_20200203224606.png!_
> But I need to mention that i have also deleted the other 3 files, or I will
> get another error:
>
> {code:java}
> ContextListenerjava.lang.LinkageError: loader constraint violation: when
> resolving method
> "org.slf4j.impl.StaticLoggerBinder.getLoggerFactory()Lorg/slf4j/ILoggerFactory;"
> the class loader 'org.apache.catalina.loader.WebappClassLoader@4d1cc3c3
> (urls: ['], parents: [)'java.net.URLClassLoader@4fccd51b']) of the current
> class, org/slf4j/LoggerFactory, and the class loader ...{code}
>
> In conclusion, I have deleted all these 4 files, then the startup.bat can run
> properly.
> I don't know whether things will go south in the future...Are these files
> useful in the solr\WEB-INF\lib? Can they be deleted like this?
> Hope I can get some instructions, thx for your time!
>
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