# NPE Exception in Java client with nested query **URL:** \ **Category:** Elasticsearch\ **Created:** [May 8, 2013, 6:38pm UTC](https://discuss.elastic.co/t/npe-exception-in-java-client-with-nested-query/11884 "2013-05-08T18:38:06Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![John\_Bartak](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/john_bartak/32/1830_2.png) [@John\_Bartak](https://discuss.elastic.co/u/John_Bartak)\ **Post date:** [May 8, 2013, 6:38pm UTC](https://discuss.elastic.co/t/npe-exception-in-java-client-with-nested-query/11884/1 "2013-05-08T18:38:06Z")
When I switched over to the 90.0 version from 20.4, I started seeing some null pointer exceptions in the Java client from my integration tests. The problem is not reproducible using the REST API. It seems to occur when you do a nested query against multiple indices and one of the indices has no documents that match a query (but does have some documents in it). The problem occurs in the AggregatedDfs.writeTo method because of the entries in the fieldStatistics map has an entry with a null key. A highly abbreviated call stack of where the exception occurs: at org.elasticsearch.common.io.stream.HandlesStreamOutput.writeString(HandlesStreamOutput.java:55) at org.elasticsearch.search.dfs.AggregatedDfs.writeTo(AggregatedDfs.java:106) at org.elasticsearch.search.query.QuerySearchRequest.writeTo(QuerySearchRequest.java:69) at org.elasticsearch.transport.netty.NettyTransport.sendRequest(NettyTransport.java:546) I've created a Gist that reproduces the problem: > -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [May 8, 2013, 8:47pm UTC](https://discuss.elastic.co/t/npe-exception-in-java-client-with-nested-query/11884/2 "2013-05-08T20:47:21Z")
Nice finding, I think it would be a good thing to open an issue on github with the full stack trace. Jörg Am 08.05.13 20:38, schrieb JBartak: > When I switched over to the 90.0 version from 20.4, I started seeing > some null pointer exceptions in the Java client from my integration > tests. The problem is not reproducible using the REST API. > > It seems to occur when you do a nested query against multiple indices > and one of the indices has no documents that match a query (but does > have some documents in it). > > The problem occurs in the AggregatedDfs.writeTo method because of the > entries in the fieldStatistics map has an entry with a null key. > > A highly abbreviated call stack of where the exception occurs: > at > org.elasticsearch.common.io.stream.HandlesStreamOutput.writeString(HandlesStreamOutput.java:55) > at > org.elasticsearch.search.dfs.AggregatedDfs.writeTo(AggregatedDfs.java:106) > at > org.elasticsearch.search.query.QuerySearchRequest.writeTo(QuerySearchRequest.java:69) > at > org.elasticsearch.transport.netty.NettyTransport.sendRequest(NettyTransport.java:546) > > ## I've created a Gist that reproduces the problem: [ES0.90.0 NPE.txt · GitHub](https://gist.github.com/bartakj/5542153) > > You received this message because you are subscribed to the Google > Groups "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![John\_Bartak](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/john_bartak/32/1830_2.png) [@John\_Bartak](https://discuss.elastic.co/u/John_Bartak)\ **Post date:** [May 8, 2013, 8:52pm UTC](https://discuss.elastic.co/t/npe-exception-in-java-client-with-nested-query/11884/3 "2013-05-08T20:52:19Z")
Posted in [https://github.com/elasticsearch/elasticsearch/issues/3014](https://github.com/elasticsearch/elasticsearch/issues/3014) -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 2:37am UTC](https://discuss.elastic.co/t/npe-exception-in-java-client-with-nested-query/11884/4 "2017-07-06T02:37:33Z")