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https://issues.apache.org/jira/browse/SOLR-14236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17029987#comment-17029987
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Shawn Heisey commented on SOLR-14236:
-------------------------------------
That message sounds like there are multiple copies of the jars for Solr on the
classpath. They may be the same jars in each location, but the Java
classloader has problems with that scenario. Your initial notes indicated that
there are two copies of the jars in different locations.
> 【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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