[Kotlin] google.api.field_behavior from proto file generates unresolved reference and results in compile error

[karthi2007]

Issue: Compile error on generated kotlin code

Proto file
I have a proto file with field_behavior attribute for a parameter.

import "buf/validate/validate.proto";
import "google/api/field_behavior.proto";

message GetABCRequest {
  string item_id = 1 [
    (buf.validate.field).string = {min_len: 1},
    (google.api.field_behavior) = REQUIRED
  ];
}

Generated code:

import com.google.api.FieldBehavior
import com.google.api.FieldBehaviorOption

public class GetABCRequest(
  @FieldBehaviorOption(value = [
    FieldBehavior.REQUIRED
  ])
  @field:WireField(
    tag = 1,
    adapter = "com.squareup.wire.ProtoAdapter#STRING",
    label = WireField.Label.OMIT_IDENTITY,
    jsonName = "itemId",
    schemaIndex = 0,
  )
  public val item_id: String = "",
  unknownFields: ByteString = ByteString.EMPTY,
) : Message<GetABCRequest, Nothing>(ADAPTER, unknownFields) {

"Config":

wire {
...
protoPath {
        srcJar("com.google.api.grpc:proto-google-common-protos:2.45.1")
        srcJar("build.buf:protovalidate:0.4.2")
    }
...
}

dependencies {
   ...
   implementation("com.google.api.grpc:proto-google-common-protos:2.45.1")
   ...
}

Issue:
Unresolved reference 'FieldBehaviorOption'.

import com.google.api.FieldBehaviorOption

There is no FieldBehaviorOption in google library to refer.

[karthi2007]

Build gradle details

wire {
...
protoPath {
        srcJar("com.google.api.grpc:proto-google-common-protos:2.45.1")
        srcJar("build.buf:protovalidate:0.4.2")
    }
...
}

dependencies {
   ...
   implementation("com.google.api.grpc:proto-google-common-protos:2.45.1")
   ...
}

[oldergod]

In the kotlin {} block, you can use those two options

    // True to emit types for options declared on messages, fields, etc.
    emitDeclaredOptions = true

    // True to emit annotations for options applied on messages, fields, etc.
    emitAppliedOptions = true

If you need the annotations, set them to true, or both to false if you don't.