Why does the scala package name differ from the Java package name?

[Aditya Prasad]

I've got three proto files that I want to be compiled into three different packages (foo.bar, foo.baz, foo.qux). Normally I'd do this using the package specifier with those values in the respective files.

For some reason ScalaPB appends the file name (minus .proto) to the package. So while my go, java, etc. clients see

foo.bar

foo.baz

foo.qux

as the package names, my Scala code has to use

foo.bar.bar

foo.baz.baz

foo.qux.qux

I know I can work around this by using "package options," but I'd rather not. Why does ScalaPB do this instead of sharing the Java package name?

Thanks,

A

[Aditya Prasad]

Ah, I just found this:

PB.flatPackage in PB.protobufConfig := true

But for some reason it doesn't work with protobuf.Any:

[error] /Users/me/work/my-project/target/src_managed/main/compiled_protobuf/my-project/v1/events/EventsProto.scala:37: value descriptor is not a member of object com.google.protobuf.AnyProto
[error]   com.google.protobuf.AnyProto.descriptor,
[error]                                ^
[error] one error found

Not sure why it would break.

[Nadav Samet]

Hi Aditya,

I summarized the cause and a possible workaround in this issue: https://github.com/trueaccord/ScalaPB/issues/155

We are adding the base file name to the generated package name as a way to avoid collisions with generated Java protocol buffers. The java code gen will take foo.proto and create a Foo static class. For Scala, if we just use the java_package, it means that Foo is not allowed as a message name or enum, and it happens to be quite a common situation.

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-Nadav

[Aditya Prasad]

Ah, thanks!

[Nadav Samet]

Actually, this issue has been fixed a few weeks ago and should be available in the recently released v0.5.38 (but also in 0.5.34).

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-Nadav