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1. loveen0111

   added the

   Bug

   issue type on Oct 7, 2026
2. Emryswu commented on Oct 21, 2026

   

   Emryswu

   on Oct 21, 2026

   More actions

   Hi, I'd like to take this one.

   I'll first try to reproduce the NPE on the current main with a ListTasks response containing explicit JSON nulls, covering both the JSON-RPC and REST paths. If it still reproduces, I'll open a PR with a regression test, following the same approach as #1174 for GetTask.
3. Emryswu commented on Oct 21, 2026

   

   Emryswu

   on Oct 21, 2026

   More actions

   I tried to reproduce this on the latest main (05f5d9b) and couldn't trigger the response-side NPE. Explicit nulls in optional fields, metadata at every level, nested objects and arrays all deserialize fine on both the JSON-RPC and REST paths. The fix from #1174 also seems to be included in 1.4.0.Final already.

   While testing, though, I did hit a separate NPE on the request side when calling listTasks(ListTasksParams.builder().build(), null) on JSONRPCTransport, which leaves the optional tenant unset (null), before any HTTP request is sent:

   java.lang.NullPointerException
       at org.a2aproject.sdk.grpc.ListTasksRequest$Builder.setTenant(ListTasksRequest.java:910)
       at org.a2aproject.sdk.grpc.mapper.ListTasksParamsMapperImpl.toProto(ListTasksParamsMapperImpl.java:44)
       at org.a2aproject.sdk.grpc.utils.ProtoUtils$ToProto.listTasksParams(ProtoUtils.java:104)
       at org.a2aproject.sdk.client.transport.jsonrpc.JSONRPCTransport.listTasks(JSONRPCTransport.java:177)
   

   @loveen0111 could you share the stack trace you're seeing? If it matches this one, I'm happy to open a PR with a regression test for it.
4. Emryswu

   added a commit that references this issue on Oct 21, 2026

   fix(grpc): avoid NPE when listTasks is called without a tenant

   ...

   c899da6