Extending CompilerConfig: InvalidProtocolBufferException "cannot find field"

I try to extend the CompilerConfig with the ProtobufMessages as provided in a PR here (https://github.com/marcoferrer/kroto-plus/pull/13/files).

I migrated all the code, but I can’t seem to solve this error when I run generateProto on my sample project app:

Caused by: com.google.protobuf.InvalidProtocolBufferException: 
   Cannot find field: mpProtobufMessages in message krotoplus.compiler.CompilerConfig

I do have this field in my config.proto:

// Configuration entries for the 'Multi-Platform Protobuf Messages' code generator.
repeated MpProtobufMessagesGenOptions mp_protobuf_messages = 27;

Also this field is present in CompilerConfig.java:

public static final int MP_PROTOBUF_MESSAGES_FIELD_NUMBER = 27;
private java.util.List<com.github.marcoferrer.krotoplus.config.MpProtobufMessagesGenOptions> mpProtobufMessages_;

And it is also in the CompilerConfig initialization

  case 218: {
    if (!((mutable_bitField0_ & 0x00000080) == 0x00000080)) {
      mpProtobufMessages_ = new java.util.ArrayList<com.github.marcoferrer.krotoplus.config.MpProtobufMessagesGenOptions>();
      mutable_bitField0_ |= 0x00000080;
    }
    mpProtobufMessages_.add(
        input.readMessage(com.github.marcoferrer.krotoplus.config.MpProtobufMessagesGenOptions.parser(), extensionRegistry));
    break;
  }

In krotoPlusConfig.yaml:

mpProtobufMessages:
  - filter:
      excludePath:
        - google/*

Complete error message from the sample project:

Execution failed for task ':generateProto'.
> protoc: stdout: . stderr: Exception in thread "main" java.lang.reflect.InvocationTargetException
  	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  	at java.lang.reflect.Method.invoke(Method.java:498)
  	at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
  	at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
  	at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
  	at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51)
  Caused by: com.google.protobuf.InvalidProtocolBufferException: Cannot find field: mpProtobufMessages in message krotoplus.compiler.CompilerConfig
  	at com.google.protobuf.util.JsonFormat$ParserImpl.mergeMessage(JsonFormat.java:1348)
  	at com.google.protobuf.util.JsonFormat$ParserImpl.merge(JsonFormat.java:1308)
  	at com.google.protobuf.util.JsonFormat$ParserImpl.merge(JsonFormat.java:1190)
  	at com.google.protobuf.util.JsonFormat$Parser.merge(JsonFormat.java:370)
  	at com.github.marcoferrer.krotoplus.generators.GeneratorContextKt.getCompilerConfig(GeneratorContext.kt:61)
  	at com.github.marcoferrer.krotoplus.generators.GeneratorContext.<init>(GeneratorContext.kt:36)
  	at com.github.marcoferrer.krotoplus.generators.GeneratorKt$contextInstance$2.invoke(Generator.kt:75)
  	at com.github.marcoferrer.krotoplus.generators.GeneratorKt$contextInstance$2.invoke(Generator.kt)
  	at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
  	at com.github.marcoferrer.krotoplus.generators.GeneratorKt.getContextInstance(Generator.kt)
  	at com.github.marcoferrer.krotoplus.generators.GeneratorKt.initializeContext(Generator.kt:61)
  	at com.github.marcoferrer.krotoplus.generators.GeneratorKt.initializeContext$default(Generator.kt:59)
  	at com.github.marcoferrer.krotoplus.KrotoPlusProtoCMain.main(KrotoPlusProtoCMain.kt:32)
  	... 8 more
  --krotoPlus_out: protoc-gen-krotoPlus: Plugin failed with status code 1.

I am unsure what else I could be doing wrong?

Hopefully someone can help me out, been stuck on this wayyy too long.

[RdeWilde]

I understand, thanks again for helping me out, this is solved for now 👍

[marcoferrer]

Looking at the example project I think it might be having issues pulling the snapshot from your local kroto branch.

You can try setting the plugin using an absolute path to your local kroto plugin build.

configure<ProtobufConfigurator> {
    generatedFilesBaseDir = "$projectDir/src/"


    protoc {
        artifact = "com.google.protobuf:protoc:3.9.0"
    }

    plugins {
        id("krotoPlus") {
            path = "path/to/protoc-gen-kroto-plus/build/libs/protoc-gen-kroto-plus-0.4.1-SNAPSHOT-jvm8.jar"
        }
    }
    ...
}