[SOLR-2270] NPE reported from QueryComponent.mergeIds with field collapse

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 4.0-ALPHA

Environment

2 cores with a shard in the same solr instance configured in distributed mode using zookeeper integration.

• Assignee: Unassigned
• Reporter: Massimo Schiavon
• Created: 07/Dec/10 11:43
• Updated: 17/Oct/16 12:37
• Resolved: 17/Oct/16 12:37

Description

This is the request:
http://***:8983/solr/1/select/?q=apache&distrib=true&group=true&group.field=site

and the exception stacktrace:
java.lang.NullPointerException
at org.apache.solr.handler.component.QueryComponent.mergeIds(QueryComponent.java:665)
at org.apache.solr.handler.component.QueryComponent.handleResponses(QueryComponent.java:560)
at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:326)
at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:131)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1359)
at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:337)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:240)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

this request works correctly:
http://***:8983/solr/1/select/?q=apache&distrib=true&group=true&group.field=site&group.main=true

I give a look at the code of QueryComponent.mergeIds(ResponseBuilder, ShardRequest)

[...]
SolrDocumentList docs = (SolrDocumentList)srsp.getSolrResponse().getResponse().get("response");
[...]

response for queries with field collapse are in a completely different format