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https://issues.apache.org/jira/browse/SOLR-7879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14662023#comment-14662023
 ] 

Gary Yang commented on SOLR-7879:
---------------------------------

Thank you for helping me correct that error in my code, but this bug still 
exists on certain conditions please see the code below:


{code:title=querySolr.java|borderStyle=solid}


        solrQuery.add( "json.facet", "\n{" +
                        "\n    powerPoint: {" +
                        "\n        type: terms," +
                        "\n        field: powerPoint_ID," +
                        "\n        sort: {" + sortCol + ": " + solrDesc + "}," +
                        "\n        offset: " + offset + "," +
                        "\n        limit: " + limit + "," +
                        "\n        facet: {" +
                        "\n            uniq_viewerNum: \"unique(viewer_ID)\"," +
                        "\n            showName:{" +
                        "\n                 type:terms," +
                        "\n                 field:powerPointName," +
                        "\n                 limit:1," +
                        "\n                 
lastUpdatedTime:\"max(powerPoint_lastUpdatedTime)\"," +
                        "\n                 sort:{lastUpdatedTime:desc}" +
                        "\n            }," +
                        "\n            viewerFirstName:{" +
                        "\n                 type:terms," +
                        "\n                 field:viewerFirstName," +
                        "\n                 limit:1," +
                        "\n                 
lastUpdatedTime:\"max(powerPoint_lastUpdatedTime)\"," +
                        "\n                 sort:{lastUpdatedTime:desc}" +
                        "\n            }," +
                        "\n            viewerLastName:{" +
                        "\n                 type:terms," +
                        "\n                 field:viewerLastName," +
                        "\n                 limit:1," +
                        "\n                 
lastUpdatedTime:\"max(powerPoint_lastUpdatedTime)\"," +
                        "\n                 sort:{lastUpdatedTime:desc}" +
                        "\n            }," +
                        "\n            viewerEmail:{" +
                        "\n                 type:terms," +
                        "\n                 field:viewerEmail," +
                        "\n                 limit:1," +
                        "\n                 
lastUpdatedTime:\"max(powerPoint_lastUpdatedTime)\"," +
                        "\n                 sort:{lastUpdatedTime:desc}" +
                        "\n            }" +
                        "\n        }" +
                        "\n    }," +
                        "\n    total: {" +
                        "\n        type: query," +
                        "\n        q: \"*:*\"," +
                        "\n        facet: {" +
                        "\n            uniq_total_view_num: 
\"unique(powerPoint_ID)\"" +
                        "\n        }" +
                        "\n    }" +
                        "\n}"


{code}
I have tried many times, for the sub facets, most of the fields work fine, but 
certain fields will cause the same nullpointerexception, even the fields that 
contain not-null value.





> Null pointer exception when 
> ----------------------------
>
>                 Key: SOLR-7879
>                 URL: https://issues.apache.org/jira/browse/SOLR-7879
>             Project: Solr
>          Issue Type: Bug
>          Components: Facet Module, search
>    Affects Versions: 5.2.1
>         Environment: Oracle jdk1.8
>            Reporter: Gary Yang
>              Labels: faceting, jsonapi, subfacet
>
> This can be reproduce by certain inputs, but I can't find a pattern in the 
> inputs that cause this error:
> Caused by: 
> org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: Error 
> from server at http://192.168.1.47:8983/solr/core1: 
> java.lang.NullPointerException
>       at 
> org.apache.solr.search.facet.FacetFieldProcessorFCBase.findTopSlots(FacetField.java:301)
>       at 
> org.apache.solr.search.facet.FacetFieldProcessorFCBase.getFieldCacheCounts(FacetField.java:254)
>       at 
> org.apache.solr.search.facet.FacetFieldProcessorFCBase.process(FacetField.java:218)
>       at 
> org.apache.solr.search.facet.FacetProcessor.processSubs(FacetRequest.java:267)
>       at 
> org.apache.solr.search.facet.FacetFieldProcessorNumeric.calcFacets(FacetFieldProcessorNumeric.java:472)
>       at 
> org.apache.solr.search.facet.FacetFieldProcessorNumeric.process(FacetFieldProcessorNumeric.java:151)
>       at 
> org.apache.solr.search.facet.FacetProcessor.processSubs(FacetRequest.java:267)
>       at 
> org.apache.solr.search.facet.FacetProcessor.fillBucket(FacetRequest.java:354)
>       at 
> org.apache.solr.search.facet.FacetQueryProcessor.process(FacetQuery.java:57)
>       at org.apache.solr.search.facet.FacetModule.process(FacetModule.java:87)
>       at 
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:255)
>       at 
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:143)
>       at org.apache.solr.core.SolrCore.execute(SolrCore.java:2064)
>       at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:654)
>       at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:450)
>       at 
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:227)
>       at 
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:196)
>       at 
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
>       at 
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
>       at 
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
>       at 
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
>       at 
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
>       at 
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
>       at 
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
>       at 
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
>       at 
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
>       at 
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
>       at 
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
>       at 
> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
>       at 
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
>       at org.eclipse.jetty.server.Server.handle(Server.java:497)
>       at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
>       at 
> org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
>       at 
> org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
>       at 
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
>       at 
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
>       at java.lang.Thread.run(Thread.java:745)



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