Compiler error: `Error while emitting ... Method too large`

[rgagne]

We have our schema split into user and admin paths. The admin path is largely simple CRUD type operations for managing objects and consist primarily of create/update/delete mutations.

The admin mutation schema looks like:

createObjectKind1(field1, field2, field3.. ) {  .. }
updateObjectKind1(id, field1, field2, field3..) { .. }
etc.

There are roughly 100-200 of these interfaces. Most objects have a handful of fields but some have upwards of 20. We did not nest the fields as objects to avoid writing a lot of marshaling code - since the fields are mostly scalar types marshaling was already handled. We use the deriveContextObjectType macro to instantiate Traits into a schema.

We recently ran into the following error when some additional mutations were added:

scalac: Error while emitting com/fluxweave/graphql/InstanceSchemaAdmin
Method too large: com/fluxweave/graphql/InstanceSchemaAdmin.$anonfun$AdminMutationType$2 (Lcom/fluxweave/graphql/InstanceSchemaAdmin;Lscala/Function1;)Lscala/collection/immutable/List;

After some trial and error we were able to work around it by changing the latest interfaces into:

createObjectKind1(object1 { field1, field2, field3.. }) {  .. }
updateObjectKind1(id, object1 { field1, field2, field3.. }) { .. }

e.g. reduce the number of top level fields

Questions:

1. Is this a known issue?
2. Would we run into this if we used the DSL to define the schema vs. the macro?
3. Is there a better way to resolve this than simplifying the interface?

Code causing the error

class AdminSchema (session: Option[WebSession], ip: RemoteAddress)
  extends QueryBase(session, ip) with QueryAdmin with MutationAdmin {}

class InstanceSchemaAdmin extends SchemaActions {

  val AdminQueryType:ObjectType[AdminSchema, Unit] =
    deriveContextObjectType[AdminSchema, QueryAdmin, Unit](identity)

  val AdminMutationType:ObjectType[AdminSchema, Unit] =
    deriveContextObjectType[AdminSchema, MutationAdmin, Unit](identity)

  val FullSchema:Schema[_,Unit] = Schema(AdminQueryType, Some(AdminMutationType))

}