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https://issues.apache.org/jira/browse/SOLR-16343?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kevin Risden updated SOLR-16343:
--------------------------------
Fix Version/s: 9.1
main (10.0)
> Handle MDC snapshot being null
> ------------------------------
>
> Key: SOLR-16343
> URL: https://issues.apache.org/jira/browse/SOLR-16343
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Dee Moore
> Assignee: Kevin Risden
> Priority: Minor
> Fix For: 9.1, main (10.0)
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Using slf4j 2 with the jdk14 adapter, SLF4J uses the NOPMDCAdapter:
> [https://www.slf4j.org/api/org/slf4j/helpers/NOPMDCAdapter.html.] This always
> returns null from MDC.getCopyOfContextMap().
> In MDCSnapshot.java, there is an assumption that the context map is never
> null. The SOLRDispatchFilter uses MDCSnapshot.
> This results in the following traceback in our project using Solr 8.11.1 up:
> {code:java}
> java.lang.NullPointerException
> at org.apache.solr.logging.MDCSnapshot.close(MDCSnapshot.java:53)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:185)
> at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:201)
> at
> org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1626)
> at
> com.sjsoft.jetty.AdminPasswordOrCertAuthFilter.doFilter(AdminPasswordOrCertAuthFilter.java:52)
> at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
> at
> org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1626)
> at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:552)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
> at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:600)
> at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
> at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1440)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
> at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:505)
> at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1355)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
> at
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:191)
> at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
> at org.eclipse.jetty.server.Server.handle(Server.java:516)
> at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:487)
> at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:732)
> at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:479)
> at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277)
> at
> org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
> at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
> at
> org.eclipse.jetty.io.ssl.SslConnection$DecryptedEndPoint.onFillable(SslConnection.java:555)
> at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:410)
> at org.eclipse.jetty.io.ssl.SslConnection$2.succeeded(SslConnection.java:164)
> at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
> at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
> at
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338)
> at
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315)
> at
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173)
> at
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:137)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034)
> at java.base/java.lang.Thread.run(Unknown Source)
> {code}
> Changing MDCSnapshot to handle the possibility of a null snapshot fixes the
> issue.
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