Firestore has trouble initialize db in Docker

Question

I'm making a Java application which will connect to a Firestore db on GCP to do some data read and write, it all worked well if I build and run with mvn, but when I build it into a Docker container, instantiating the Firestore instance will throw error

java.lang.IllegalArgumentException: Address types of NameResolver 'unix' for 'firestore.googleapis.com:443' not supported by transport

This is how my code looks like

String serviceAccountPath = "path to a json";

Credentials credentials;
try (FileInputStream serviceAccountStream = new FileInputStream(serviceAccountPath)) {
  credentials = GoogleCredentials.fromStream(serviceAccountStream);
}

firestore = FirestoreOptions.newBuilder()
  .setProjectId("project id")
  .setDatabaseId("my db name")
  .setCredentials(credentials)
  .setTransportOptions(
    FirestoreOptions.getDefaultTransportOptionsBuilder().build()
  )
  .build()
  .getService();

This is my Dockerfile

FROM maven:3.8.4-jdk-11

# Set the working directory to /
WORKDIR /

# Copy the Java source code into the container
COPY . /

ENV GRPC_DNS_RESOLVER="dns"
ENV GRPC_DEFAULT_SSL_PROVIDER="netty"
ENV GRPC_DEFAULT_TRANSPORT="netty"

RUN mvn compile 
RUN mvn package compile

# Expose the gRPC port
EXPOSE 50051
EXPOSE 443

# Run the gRPC service when the container starts
CMD ["java","-Dio.grpc.netty.shaded.io.netty.transport.noNative=false", "-jar", "target/Backend-1.0-SNAPSHOT-jar-with-dependencies.jar"]

Again, this all worked if I run it on my Mac with mvn, but it is just not working with Docker.

Answer 1

It turns out I didn't use the correct CMD to start the server, replaced with

CMD ["mvn", "exec:java", "-Dexec.mainClass={mymainclass}"]

then it just worked the same way as localhost.