java.lang.ClassNotFoundException: scalapb.ScalaPbCodeGenerator since version 0.10.10

[segfault16]

Hi,

Since version 0.10.10 I'm getting the following error:

protoc --proto_path=api --plugin=/usr/local/bin/protoc-gen-scala --scala_out=scala api/harmonization.proto
Error: Could not find or load main class scalapb.ScalaPbCodeGenerator
Caused by: java.lang.ClassNotFoundException: scalapb.ScalaPbCodeGenerator
--scala_out: protoc-gen-scala: Plugin failed with status code 1.

version 0.10.9 and prior is working fine.

Tested with the following Dockerfile:

FROM adoptopenjdk/openjdk13:debian
WORKDIR /tmp/build

ENV PROTOC_VERSION 3.12.3
ENV SCALAPB_VERSION 0.10.10

RUN apt-get update && apt-get install -y unzip util-linux bsdmainutils

RUN curl -LO https://github.com/protocolbuffers/protobuf/releases/download/v$PROTOC_VERSION/protoc-$PROTOC_VERSION-linux-x86_64.zip  && \
    unzip protoc-$PROTOC_VERSION-linux-x86_64.zip && \
    cp bin/protoc /usr/local/bin && \
    chmod +x /usr/local/bin/protoc && \
    cp -a include/. /usr/local/include/

RUN curl -LO https://github.com/scalapb/ScalaPB/releases/download/v$SCALAPB_VERSION/protoc-gen-scala-$SCALAPB_VERSION-linux-x86_64.zip && \
    unzip protoc-gen-scala-$SCALAPB_VERSION-linux-x86_64.zip && \
    cp protoc-gen-scala /usr/local/bin/protoc-gen-scala && \
    chmod +x /usr/local/bin/protoc-gen-scala

# Install task
WORKDIR /usr/local
RUN curl -sL https://taskfile.dev/install.sh  | sh 

CMD ["protoc", "--help"]

WORKDIR /tmp

[thesamet]

Thanks for reporting and providing a way to reproduce. It looks like we've hit some variant of scala/bug#11634 impacting Scala 2.12. I updated to Scala 2.13 and transitioned to sbt-native-image which workarounds additional graalvm issues impacting Scala 2.13.