java: updated protobuf-java dep version, moved local build to docker (#…

…121)

* java: updated protobuf-java dep version, moved local build to docker

* Updated the Slack invite URL

* chore: Replace compile with implementation for Java Gradle dependency  (#123)

Fixed deprecated method in Java Gradle dependency - replaced compile with implementation.
Closes #122.

* use maven docker image

* switch to java 11 for better backwards compatibility

---------

Co-authored-by: Frédéric Simard <frederic-contractor@mobilitydata.org>
Co-authored-by: Jingsi Lu <5789435+qcdyx@users.noreply.github.com>

java/Dockerfile

@@ -0,0 +1,21 @@
+FROM maven:3.9.2-eclipse-temurin-11
+
+WORKDIR /lib
+
+# Install protoc (cf. http://google.github.io/proto-lens/installing-protoc.html)
+ENV PROTOC_ZIP=protoc-21.12-linux-x86_64.zip
+RUN apt-get update && apt-get install -y unzip
+RUN curl -OL https://github.com/protocolbuffers/protobuf/releases/download/v21.12/$PROTOC_ZIP \
+ && unzip -o $PROTOC_ZIP -d /usr/local bin/protoc \
+ && unzip -o $PROTOC_ZIP -d /usr/local 'include/*' \
+ && rm -f $PROTOC_ZIP
+
+RUN mkdir -p src/main/java
+RUN mkdir -p src/test/java/com/google/transit/realtime
+RUN mkdir -p src/test/resources/com/google/transit/realtime
+COPY gtfs-realtime.proto /lib/gtfs-realtime.proto
+COPY java/pom.xml /lib/pom.xml
+COPY java/src/test/java/com/google/transit/realtime/GtfsRealtimeTest.java src/test/java/com/google/transit/realtime/GtfsRealtimeTest.java
+COPY java/src/test/resources/com/google/transit/realtime/* src/test/resources/com/google/transit/realtime
+
+CMD protoc --java_out=src/main/java gtfs-realtime.proto && mvn verify

java/UPDATING.md

@@ -4,27 +4,17 @@
 
 #### One-Time Setup
 
-1. Download and setup Protocol Buffer release from https://github.com/protocolbuffers/protobuf/releases (if you haven't already done this for another language). As of February 2019 we're using v3.7 release, which is compatible with proto2 .proto files.
-1. Download [Java JDK](https://www.oracle.com/technetwork/java/javase/downloads/index.html)
-1. Download and install [Maven](https://maven.apache.org/download.cgi)
+1. Download and install [Docker](https://docs.docker.com/get-docker/)
 
 #### Every time `gtfs-realtime.proto` changes
 
-Regenerate the language binding source from gtfs-realtime.proto.
+1. Run the update script:
 
-From the project `/java` folder, run:
+ ```
+ ./update_generated_code.sh
+ ```
 
-```
-protoc --java_out=src/main/java --proto_path=.. ../gtfs-realtime.proto
-```
-
-Add the license header back to the generated source file.
-
-Test the generated code:
-
-```
-mvn verify
-````
+1. Add the license header back to the generated source file.
 
 ## Publishing a new release.
 

java/pom.xml

@@ -64,7 +64,7 @@
  <dependency>
  <groupId>com.google.protobuf</groupId>
  <artifactId>protobuf-java</artifactId>
- <version>3.16.1</version>
+ <version>3.21.12</version>
  </dependency>
  <dependency>
  <groupId>junit</groupId>