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https://issues.apache.org/jira/browse/SOLR-3238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230104#comment-13230104
 ] 

Vadim Kisselmann commented on SOLR-3238:
----------------------------------------

Now i have error messages:

SCHWERWIEGEND: The web application [/solr2] appears to have started a thread 
named [main-SendThread(zookeeper:2181)] but has failed to stop it. This is very 
likely to create a memory leak.
Exception in thread "Thread-2" java.lang.NullPointerException
        at 
org.apache.solr.cloud.Overseer$CloudStateUpdater.amILeader(Overseer.java:179)
        at 
org.apache.solr.cloud.Overseer$CloudStateUpdater.run(Overseer.java:104)
        at java.lang.Thread.run(Thread.java:662)
15.03.2012 13:25:17 org.apache.catalina.loader.WebappClassLoader loadClass
INFO: Illegal access: this web application instance has been stopped already.  
Could not load org.apache.zookeeper.server.ZooTrace.  The eventual following 
stack trace is caused by an error thrown for debugging purposes as well as to 
attempt to terminate the thread which caused the illegal access, and has no 
functional impact.
java.lang.IllegalStateException
        at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1531)
        at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1196)
15.03.2012 13:25:17 org.apache.coyote.http11.Http11Protocol destroy

SLF4J: The requested version 1.5.8 by your slf4j binding is not compatible with 
[1.6]
SLF4J: See http://www.slf4j.org/codes.html#version_mismatch for further details.
log4j:WARN No appenders could be found for logger 
(org.apache.solr.core.SolrResourceLoader).
log4j:WARN Please initialize the log4j system properly.


Steps:
I deleted the one default core in solr.xml, because i would create new cores 
with CoreAdminHandler.
I started tomcat.
                
> Sequel of Admin UI
> ------------------
>
>                 Key: SOLR-3238
>                 URL: https://issues.apache.org/jira/browse/SOLR-3238
>             Project: Solr
>          Issue Type: Improvement
>          Components: web gui
>    Affects Versions: 4.0
>            Reporter: Stefan Matheis (steffkes)
>            Assignee: Stefan Matheis (steffkes)
>             Fix For: 4.0
>
>
> Catch-All Issue for all upcoming Bugs/Reports/Suggestions on the Admin UI

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