Markus Jelsma created SOLR-12995:
------------------------------------

             Summary: UnsupportedOperationException in 
HttpSolrCall.getRemotCoreUrl()
                 Key: SOLR-12995
                 URL: https://issues.apache.org/jira/browse/SOLR-12995
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
    Affects Versions: 7.5
         Environment: Debian 9.3, OpenJDK Runtime Environment (build 
1.8.0_181-8u181-b13-2~deb9u1-b13)
            Reporter: Markus Jelsma
             Fix For: master (8.0)


Spotted two of these in the logs of a production server. That collection's 
other replicas didn't log this error. In all the logs, i have seen only two 
occurences, just four minutes apart.

{code}
2018-11-07 16:14:04.340 ERROR (qtp831236296-1185) [   ] o.a.s.s.HttpSolrCall 
null:java.lang.UnsupportedOperationException
        at java.util.AbstractList.add(AbstractList.java:148)
        at java.util.AbstractList.add(AbstractList.java:108)
        at 
org.apache.solr.servlet.HttpSolrCall.getRemotCoreUrl(HttpSolrCall.java:905)
        at 
org.apache.solr.servlet.HttpSolrCall.extractRemotePath(HttpSolrCall.java:431)
        at org.apache.solr.servlet.HttpSolrCall.init(HttpSolrCall.java:288)
        at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:469)
        at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:377)
        at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:323)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
        at 
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:219)
        at 
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at 
org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.Server.handle(Server.java:531)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)
        at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
        at 
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
        at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
        at 
org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680)
        at java.lang.Thread.run(Thread.java:748)
{code}



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