Protocol Buffers are a way of encoding structured data in an efficient yet extensible format. 4.12 UTF-8 ${project.basedir}/../.. 19.0 ${protobuf.basedir}/src ${project.build.directory}/generated-sources test UTF-8 2.2.1 test ${protobuf.source.dir}/protoc 2.2 ${project.build.directory}/generated-test-sources-lite ${project.build.directory}/generated-sources-lite 6cf0c5ea3b97a31bf5f6056ae2c385151a9df5ee ${project.build.directory}/generated-test-sources src/test/proto test