System.NullReferenceException when creating a SniffingConnectionPool on Mono.

[maeserichar]

When using branch 2.0 on Mono 2.0.4, we are trying to create a SniffingConnectionPool, but we get a NRE with the following stack trace:

System.NullReferenceException : Object reference not set to an instance of an object
  at System.Uri.GetHashCode () [0x0001c] in /builddir/build/BUILD/mono-4.0.4/mcs/class/System/System/Uri.cs:821
  at System.Collections.Generic.DefaultComparer`1[System.Uri].GetHashCode (System.Uri obj) [0x0000d] in /builddir/build/BUILD/mono-4.0.4/mcs/class/corlib/System.Collections.Generic/EqualityComparer.cs:117
  at System.Collections.Generic.Dictionary`2[System.Uri,System.Collections.Generic.List`1[Elasticsearch.Net.Connection.Node]].Insert (System.Uri key, System.Collections.Generic.List`1 value, Boolean add) [0x00023] in /builddir/build/BUILD/mono-4.0.4/external/referencesource/mscorlib/system/collections/generic/dictionary.cs:319
  at System.Collections.Generic.Dictionary`2[System.Uri,System.Collections.Generic.List`1[Elasticsearch.Net.Connection.Node]].Add (System.Uri key, System.Collections.Generic.List`1 value) [0x00000] in /builddir/build/BUILD/mono-4.0.4/external/referencesource/mscorlib/system/collections/generic/dictionary.cs:185
  at System.Linq.Enumerable+<CreateGroupByIterator>c__Iterator5`2[Elasticsearch.Net.Connection.Node,System.Uri].MoveNext () [0x000e0] in /builddir/build/BUILD/mono-4.0.4/mcs/class/System.Core/System.Linq/Enumerable.cs:918
  at System.Linq.Enumerable+<CreateSelectIterator>c__Iterator10`2[System.Linq.IGrouping`2[System.Uri,Elasticsearch.Net.Connection.Node],Elasticsearch.Net.Connection.Node].MoveNext () [0x00059] in /builddir/build/BUILD/mono-4.0.4/mcs/class/System.Core/System.Linq/Enumerable.cs:2266
  at System.Collections.Generic.List`1[Elasticsearch.Net.Connection.Node]..ctor (IEnumerable`1 collection) [0x0008b] in /builddir/build/BUILD/mono-4.0.4/external/referencesource/mscorlib/system/collections/generic/list.cs:105
  at System.Linq.Enumerable.ToList[Node] (IEnumerable`1 source) [0x00006] in /builddir/build/BUILD/mono-4.0.4/mcs/class/System.Core/System.Linq/Enumerable.cs:2948
  at Elasticsearch.Net.ConnectionPool.StaticConnectionPool..ctor (IEnumerable`1 nodes, Boolean randomize, IDateTimeProvider dateTimeProvider) [0x00000] in <filename unknown>:0
  at Elasticsearch.Net.ConnectionPool.StaticConnectionPool..ctor (IEnumerable`1 uris, Boolean randomize, IDateTimeProvider dateTimeProvider) [0x00000] in <filename unknown>:0
  at Elasticsearch.Net.ConnectionPool.SniffingConnectionPool..ctor (IEnumerable`1 uris, Boolean randomize, IDateTimeProvider dateTimeProvider) [0x00000] in <filename unknown>:0

Same code works on .Net without problems. If I modify the Purify method in Purify.cs to return the Uri unchanged on mono, it works, so it seems that the problem is in PurifierMono.

[godefroi]

Same issue on .NET with v1.7.1. It seems that the serializer is null, even if one is explicitly passed into the ElasticClient constructor.

[kharnt0x]

Hi all, is there any planned fix or available workaround for this? it's impacting us as well.

[godefroi]

The fix is to wait for a version compatible with ES 2.x to be released...

[Mpdreamz]

Can confirm this still happens on our master branch, working on a fix! Thanks for raising this issue and sorry for not giving it the love it needed for this long.