DataFetchingException when fetching users with nodeReference fields with GraphQL

[bernhardriegler]

Gentics Mesh Version, operating system, or hardware.

• v0.18.2

Problem

When fetching userdata via the graphql endpoint and including the nodeReference and its fields an DataFetchingException will be thrown.
Also no fields of the referenced node will be returned

Reproducer

• create a node to use as a reference
• create a user and set the nodeReference property to the earlier created node
• get users and nodeReference with fields from graphQL endpiont
  POST: {{ API }}/{{ PROJECT }}/graphql

{
  users {
    elements {
      username
      nodeReference {
        uuid
        fields {
          ... on additionalUserData {
            company
          }
        }
      }
    }
  }
}

Actual behaviour

no fields are in the response.
i.e.

{
    "errors": [{
        "message": "Exception while fetching data (/users/elements[0]/nodeReference/fields) : null",
        "type": "DataFetchingException"
    }],
    "data": {
        "users": {
            "elements": [{
                "username": "{{ USERNAME }}",
                "nodeReference": {
                    "uuid": "{{ UUID }}",
                    "fields": null
                }
            }]
        }
    }
}

Expected behaviour

all fields should be returned as queried.

{
    "data": {
        "users": {
            "elements": [{
                "username": "{{ USERNAME }}",
                "nodeReference": {
                    "uuid": "{{ UUID }}",
                    "fields": [{
                        "company": "test"
                    }]
                }
            }]
        }
    }
}

[bernhardriegler]

The originally raised issue is solved by now.
However there are new issues in Gentics Mesh 1.0.2

These issues are reproducable at demo.getmesh.io

To do so please add a nodeReference to a users first.

A) using graphql v1

when requesting fields the result will contain errors for each users which does not have a nodeReference set.

mesh_1  | 13:57:13.345 [] ERROR [vert.x-worker-thread-3] [c.g.m.g.GraphQLHandler] - Error while fetching data.
mesh_1  | java.lang.ClassCastException: class com.gentics.mesh.core.data.node.impl.NodeImpl cannot be cast to class com.gentics.mesh.core.data.node.NodeContent (com.gentics.mesh.core.data.node.impl.NodeImpl and com.gentics.mesh.core.data.node.NodeContent are in unnamed module of loader 'app')
mesh_1  |       at com.gentics.mesh.graphql.type.NodeTypeProvider.lambda$null$24(NodeTypeProvider.java:503)
mesh_1  |       at graphql.execution.ExecutionStrategy.fetchField(ExecutionStrategy.java:258)
mesh_1  |       at graphql.execution.ExecutionStrategy.resolveFieldWithInfo(ExecutionStrategy.java:199)
mesh_1  |       at graphql.execution.AsyncExecutionStrategy.execute(AsyncExecutionStrategy.java:70)
mesh_1  |       at graphql.execution.ExecutionStrategy.completeValueForObject(ExecutionStrategy.java:633)
mesh_1  |       at graphql.execution.ExecutionStrategy.completeValue(ExecutionStrategy.java:413)
mesh_1  |       at graphql.execution.ExecutionStrategy.completeField(ExecutionStrategy.java:363)
mesh_1  |       at graphql.execution.ExecutionStrategy.lambda$resolveFieldWithInfo$0(ExecutionStrategy.java:201)
mesh_1  |       at java.base/java.util.concurrent.CompletableFuture.uniApplyNow(Unknown Source)
mesh_1  |       at java.base/java.util.concurrent.CompletableFuture.uniApplyStage(Unknown Source)
mesh_1  |       at java.base/java.util.concurrent.CompletableFuture.thenApply(Unknown Source)
mesh_1  |       at graphql.execution.ExecutionStrategy.resolveFieldWithInfo(ExecutionStrategy.java:200)
mesh_1  |       at graphql.execution.AsyncExecutionStrategy.execute(AsyncExecutionStrategy.java:70)
mesh_1  |       at graphql.execution.ExecutionStrategy.completeValueForObject(ExecutionStrategy.java:633)
mesh_1  |       at graphql.execution.ExecutionStrategy.completeValue(ExecutionStrategy.java:413)
mesh_1  |       at graphql.execution.ExecutionStrategy.completeValueForList(ExecutionStrategy.java:512)
mesh_1  |       at graphql.execution.ExecutionStrategy.completeValueForList(ExecutionStrategy.java:460)
mesh_1  |       at graphql.execution.ExecutionStrategy.completeValue(ExecutionStrategy.java:398)
mesh_1  |       at graphql.execution.ExecutionStrategy.completeField(ExecutionStrategy.java:363)
mesh_1  |       at graphql.execution.ExecutionStrategy.lambda$resolveFieldWithInfo$0(ExecutionStrategy.java:201)
mesh_1  |       at java.base/java.util.concurrent.CompletableFuture.uniApplyNow(Unknown Source)
mesh_1  |       at java.base/java.util.concurrent.CompletableFuture.uniApplyStage(Unknown Source)
mesh_1  |       at java.base/java.util.concurrent.CompletableFuture.thenApply(Unknown Source)
mesh_1  |       at graphql.execution.ExecutionStrategy.resolveFieldWithInfo(ExecutionStrategy.java:200)
mesh_1  |       at graphql.execution.AsyncExecutionStrategy.execute(AsyncExecutionStrategy.java:70)
mesh_1  |       at graphql.execution.ExecutionStrategy.completeValueForObject(ExecutionStrategy.java:633)
mesh_1  |       at graphql.execution.ExecutionStrategy.completeValue(ExecutionStrategy.java:413)
mesh_1  |       at graphql.execution.ExecutionStrategy.completeField(ExecutionStrategy.java:363)
mesh_1  |       at graphql.execution.ExecutionStrategy.lambda$resolveFieldWithInfo$0(ExecutionStrategy.java:201)
mesh_1  |       at java.base/java.util.concurrent.CompletableFuture.uniApplyNow(Unknown Source)
mesh_1  |       at java.base/java.util.concurrent.CompletableFuture.uniApplyStage(Unknown Source)
mesh_1  |       at java.base/java.util.concurrent.CompletableFuture.thenApply(Unknown Source)
mesh_1  |       at graphql.execution.ExecutionStrategy.resolveFieldWithInfo(ExecutionStrategy.java:200)
mesh_1  |       at graphql.execution.AsyncExecutionStrategy.execute(AsyncExecutionStrategy.java:70)
mesh_1  |       at graphql.execution.Execution.executeOperation(Execution.java:158)
mesh_1  |       at graphql.execution.Execution.execute(Execution.java:100)
mesh_1  |       at graphql.GraphQL.execute(GraphQL.java:554)
mesh_1  |       at graphql.GraphQL.parseValidateAndExecute(GraphQL.java:496)
mesh_1  |       at graphql.GraphQL.executeAsync(GraphQL.java:470)
mesh_1  |       at graphql.GraphQL.execute(GraphQL.java:401)
mesh_1  |       at com.gentics.mesh.graphql.GraphQLHandler.handleQuery(GraphQLHandler.java:60)
mesh_1  |       at com.gentics.mesh.graphql.GraphQLEndpoint.lambda$registerEndPoints$0(GraphQLEndpoint.java:48)
mesh_1  |       at io.vertx.ext.web.impl.BlockingHandlerDecorator.lambda$handle$0(BlockingHandlerDecorator.java:48)
mesh_1  |       at io.vertx.core.impl.ContextImpl.lambda$executeBlocking$2(ContextImpl.java:316)
mesh_1  |       at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
mesh_1  |       at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
mesh_1  |       at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
mesh_1  |       at java.base/java.lang.Thread.run(Unknown Source)
mesh_1  | 13:57:13.346 [] WARN  [vert.x-worker-thread-3] [c.g.m.g.GraphQLHandler] - Encountered {13} errors while executing query {{
mesh_1  |   users {
mesh_1  |     elements {
mesh_1  |       uuid
mesh_1  |       username
mesh_1  |       firstname
mesh_1  |       lastname
mesh_1  |       emailAddress
mesh_1  |       created
mesh_1  |       groups {
mesh_1  |         elements {
mesh_1  |           name
mesh_1  |           uuid
mesh_1  |         }
mesh_1  |       }
mesh_1  |       nodeReference {
mesh_1  |         uuid
mesh_1  |         fields {
mesh_1  |             ... on additionalUserData {
mesh_1  | company
mesh_1  |             }
mesh_1  |         }
mesh_1  |       }
mesh_1  |     }
mesh_1  |   }
mesh_1  | }
mesh_1  | }
mesh_1  | 13:57:13.347 [] INFO  [vert.x-worker-thread-3] [i.v.e.w.h.i.LoggerHandlerImpl] - 172.18.0.1 - POST /api/v1/MAM_API_Assets/graphql?version=published HTTP/1.1 200 15320 - 40 ms

Here is an example running at the demo:
https://demo.getmesh.io/api/v1/demo/graphql/browser/#query=%7B%0A%20%20users%20%7B%0A%20%20%20%20elements%20%7B%0A%20%20%20%20%20%20uuid%0A%20%20%20%20%20%20nodeReference%20%7B%0A%20%20%20%20%20%20%20%20uuid%0A%20%20%20%20%20%20%20%20fields%20%7B%0A%20%20%20%20%20%20%20%20%20%20...%20on%20vehicle%20%7B%0A%20%20%20%20%20%20%20%20%20%20%20%20slug%0A%20%20%20%20%20%20%20%20%20%20%7D%0A%20%20%20%20%20%20%20%20%7D%0A%20%20%20%20%20%20%7D%0A%20%20%20%20%7D%0A%20%20%7D%0A%7D%0A&variables=%7B%7D

b) when using graphql v2

internel server error is returned.
here is an example at the demo:
https://demo.getmesh.io/api/v2/demo/graphql/browser/#query=%7B%0A%20%20users%20%7B%0A%20%20%20%20elements%20%7B%0A%20%20%20%20%20%20uuid%0A%20%20%20%20%20%20nodeReference%20%7B%0A%20%20%20%20%20%20%20%20uuid%0A%20%20%20%20%20%20%7D%0A%20%20%20%20%7D%0A%20%20%7D%0A%7D%0A&variables=%7B%7D