[ 
https://issues.apache.org/jira/browse/SOLR-16805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17724292#comment-17724292
 ] 

Houston Putman commented on SOLR-16805:
---------------------------------------

So from your initial logs, I see "org.apache.solr.security.KerberosPlugin", 
which is not the path of the kerberosPlugin. The correct path is 
"org.apache.solr.security.hadoop.KerberosPlugin".

 

Does your security.json use "solr.KerberosPlugin" or 
"org.apache.solr.security.KerberosPlugin"?

> org.apache.solr.common.SolrException:  Error loading class 
> 'solr.KerberosPlugin'
> --------------------------------------------------------------------------------
>
>                 Key: SOLR-16805
>                 URL: https://issues.apache.org/jira/browse/SOLR-16805
>             Project: Solr
>          Issue Type: Bug
>          Components: Authentication
>    Affects Versions: 9.2.1
>         Environment: OS: Debian 11
> Solr Version : 9.2.1
> Java Version: 11
>            Reporter: Senthil Kumar
>            Assignee: Houston Putman
>            Priority: Major
>              Labels: kerberos, solrcloud
>
> I am facing the same "Error loading class 'solr.KerberosPlugin'" even in Solr 
> 9.2.1
>  
> I have copied hadoop-auth classes to WEB_INF/lib and also tried setting 
> SOLR_MODULES=hadoop-auth,hdfs too. But still I am seeing this issue both in 
> 9.2.0 and 9.2.1
>  
> It will be helpful if you add more insight to resolve this issue
>  
> Below is the Error stack trace:
> {{
> 2023-05-17 11:02:38.998 INFO  (zkCallback-13-thread-1) [] 
> o.a.s.c.c.ZkStateReader Updated live nodes from ZooKeeper... (0) -> (1)
> 2023-05-17 11:02:39.037 INFO  (main) [] o.a.s.c.CoreContainer Initializing 
> authentication plugin: org.apache.solr.security.KerberosPlugin
> 2023-05-17 11:02:39.044 ERROR (main) [] o.a.s.s.CoreContainerProvider Could 
> not start Solr. Check solr/home property and the logs
> 2023-05-17 11:02:39.064 ERROR (main) [] o.a.s.c.SolrCore null => 
> *org.apache.solr.common.SolrException:  Error loading class 
> 'org.apache.solr.security.KerberosPlugin'*
>         at 
> org.apache.solr.core.{*}SolrResourceLoader.findClass(SolrResourceLoader.java:550){*}
> org.apache.solr.common.SolrException:  *Error loading class 
> 'org.apache.solr.security.KerberosPlugin'*
>         at 
> org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:550)
>  ~[solr-core-9.2.1.jar:9.2.1 a4c64ab6a2a270ca69c28c706dabb2927ed8a7c2 - 
> jsweeney - 2023-04-24 11:35:31]
>         at 
> org.apache.solr.core.SolrResourceLoader.newInstance(SolrResourceLoader.java:612)
>  ~[solr-core-9.2.1.jar:9.2.1 a4c64ab6a2a270ca69c28c706dabb2927ed8a7c2 - 
> jsweeney - 2023-04-24 11:35:31]
>         at 
> org.apache.solr.core.{*}CoreContainer.initializeAuthenticationPlugin(CoreContainer.java:558){*}
>  ~[solr-core-9.2.1.jar:9.2.1 a4c64ab6a2a270ca69c28c706dabb2927ed8a7c2 - 
> jsweeney - 2023-04-24 11:35:31]
>         at 
> org.apache.solr.core.CoreContainer.reloadSecurityProperties(CoreContainer.java:1159)
>  ~[solr-core-9.2.1.jar:9.2.1 a4c64ab6a2a270ca69c28c706dabb2927ed8a7c2 - 
> jsweeney - 2023-04-24 11:35:31]
>         at 
> org.apache.solr.core.{*}CoreContainer.load(CoreContainer.java:823){*} 
> ~[solr-core-9.2.1.jar:9.2.1 a4c64ab6a2a270ca69c28c706dabb2927ed8a7c2 - 
> jsweeney - 2023-04-24 11:35:31]
>         at 
> org.apache.solr.servlet.CoreContainerProvider.createCoreContainer(CoreContainerProvider.java:412)
>  ~[solr-core-9.2.1.jar:9.2.1 a4c64ab6a2a270ca69c28c706dabb2927ed8a7c2 - 
> jsweeney - 2023-04-24 11:35:31]
>         at 
> org.apache.solr.servlet.CoreContainerProvider.init(CoreContainerProvider.java:230)
>  ~[solr-core-9.2.1.jar:9.2.1 a4c64ab6a2a270ca69c28c706dabb2927ed8a7c2 - 
> jsweeney - 2023-04-24 11:35:31]
>         at 
> org.apache.solr.servlet.CoreContainerProvider.contextInitialized(CoreContainerProvider.java:114)
>  ~[solr-core-9.2.1.jar:9.2.1 a4c64ab6a2a270ca69c28c706dabb2927ed8a7c2 - 
> jsweeney - 2023-04-24 11:35:31]
>         at 
> org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:1048)
>  ~[jetty-server-10.0.13.jar:10.0.13]
>         at 
> org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:624)
>  ~[jetty-servlet-10.0.13.jar:10.0.13]
>         at 
> org.eclipse.jetty.server.handler.ContextHandler.contextInitialized(ContextHandler.java:983)
>  ~[jetty-server-10.0.13.jar:10.0.13]
>         at 
> org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:740) 
> ~[jetty-servlet-10.0.13.jar:10.0.13]
>         at 
> org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:392)
>  ~[jetty-servlet-10.0.13.jar:10.0.13]
>         at 
> org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1304) 
> ~[jetty-webapp-10.0.13.jar:10.0.13]
>         at 
> org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:900)
>  ~[jetty-server-10.0.13.jar:10.0.13]
>         at 
> org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:306)
>  ~[jetty-servlet-10.0.13.jar:10.0.13]
>         at 
> org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:532) 
> ~[jetty-webapp-10.0.13.jar:10.0.13]
>         at 
> org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:93)
>  ~[jetty-util-10.0.13.jar:10.0.13]
>         at 
> org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:171)
>  ~[jetty-util-10.0.13.jar:10.0.13]
> }}



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