Let's say I'm using group.field=ip in a query. If the index contains documents where the ip field is the empty string, grouping fails with NullPointerException in the response writer. From our perspective, this is a bad document that we have to fix, but I don't think it should have failed the query (HTTP response code 500). The empty string might be a perfectly valid value for some use cases.
This is in Solr 4.7.2 and 4.9.1. Is this a bug, or expected behavior? FYI, I cannot check if the same problem exists in 5.x, because of something else I stumbled across while working on a monitoring script which uses these queries: https://issues.apache.org/jira/browse/SOLR-8088 Here's the full exception from Solr 4.9.1: java.lang.NullPointerException at org.apache.solr.response.JSONWriter.writeSolrDocument(JSONResponseWriter.java:330) at org.apache.solr.response.TextResponseWriter.writeSolrDocumentList(TextResponseWriter.java:220) at org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:182) at org.apache.solr.response.JSONWriter.writeNamedListAsMapWithDups(JSONResponseWriter.java:184) at org.apache.solr.response.JSONWriter.writeNamedList(JSONResponseWriter.java:300) at org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:186) at org.apache.solr.response.JSONWriter.writeArray(JSONResponseWriter.java:542) at org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:188) at org.apache.solr.response.JSONWriter.writeNamedListAsMapWithDups(JSONResponseWriter.java:184) at org.apache.solr.response.JSONWriter.writeNamedList(JSONResponseWriter.java:300) at org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:186) at org.apache.solr.response.JSONWriter.writeNamedListAsMapWithDups(JSONResponseWriter.java:184) at org.apache.solr.response.JSONWriter.writeNamedList(JSONResponseWriter.java:300) at org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:186) at org.apache.solr.response.JSONWriter.writeNamedListAsMapWithDups(JSONResponseWriter.java:184) at org.apache.solr.response.JSONWriter.writeNamedList(JSONResponseWriter.java:300) at org.apache.solr.response.JSONWriter.writeResponse(JSONResponseWriter.java:96) at org.apache.solr.response.JSONResponseWriter.write(JSONResponseWriter.java:61) at org.apache.solr.servlet.SolrDispatchFilter.writeResponse(SolrDispatchFilter.java:765) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:426) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1476) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) at org.eclipse.jetty.server.Server.handle(Server.java:370) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494) at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543) at java.lang.Thread.run(Thread.java:745) Thanks, Shawn
