protoc generated JAVA classes have always errors in GeneratedMessageLite and GeneratedMessageV3

[Markus Keggel]

Dear List,

I desperately try to generate JAVA classes for Protocol buffers. I tried protobuf-21.7, protobuf-21.6 and the latest protobuf-main but there are always two classes that are faulty:

com.google.protobuf.GeneratedMessageLite

Line 1307:       if (instance.extensions != FieldSet.emptySet()) {

Incompatible operand types FieldSet<GeneratedMessageLite.ExtensionDescriptor> and FieldSet<FieldSet.FieldDescriptorLite<FieldSet.FieldDescriptorLite<T>>>    

and class com.google.protobuf.GeneratedMessageV3

Line 1679: ? (FieldSet<FieldDescriptor>) FieldSet.emptySet()

Cannot cast from FieldSet<FieldSet.FieldDescriptorLite<FieldSet.FieldDescriptorLite<T>>> to FieldSet<Descriptors.FieldDescriptor>

Is there anyone who can solve this? I am unable to fix this. 

Thank you very much for your help,

Markus

[Derek Perez]

Do you have the ability to setup a simple reproducing github project so we can try and replicate the issue here?

[Markus Keggel]

I added a Repo here:

https://github.com/mkeggel/gtfsrt

Thank you for looking into it. 

Markus

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[Derek Perez]

OK I think a few things seem wrong here:

1. I'm not sure why you have the protobuf runtime source code in your project, I'd suggest not doing that and referencing it as a jar through maven.

2. The jar you referenced has a pom that is doing that and I suspect you're confusing the classloader because that is using version 3.16.1 https://repo1.maven.org/maven2/org/mobilitydata/gtfs-realtime-bindings/0.0.8/gtfs-realtime-bindings-0.0.8.pom

3. I'd look into generating your proto files JIT using a maven plugin like so: https://www.xolstice.org/protobuf-maven-plugin/

Hope that helps!

- D