Exception when scalar object contains non json Serializable fields

[adisesha]

The issue is similar to #240 but this time because of changes in Jackson 2.10.0. See FasterXML/jackson-databind#2220. As mentioned by @ophelie in this reply, #240 (comment), it used to work because Jackson ObjectMapper had short circuit logic until 2.9.9. Now file upload breaks in all cases. The same applies for any class whose fields doesn't have Jackson serializer.

I feel this issue is in com.coxautodev.graphql.tools.MethodFieldResolver#isScalarType. It returns false for custom scalar types.

I added test to replicate the issue here, https://github.com/adisesha/graphql-java-tools/tree/jackson_2_10_0_bug.

Please suggest a work around for this. Also let me know if you need any other details. Thanks .

[adisesha]

#342 fixes this