pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project
        xmlns="http://maven.apache.org/POM/4.0.0"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>org.demo</groupId>
    <artifactId>grpc-sample</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>
    <build>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>exec-maven-plugin</artifactId>
                <version>3.0.0</version>
                <executions>
                    <execution>
                        <id>install-python</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>exec</goal>
                        </goals>
                        <configuration>
                            <!-- install Python requirements -->
                            <executable>bash</executable>
                            <workingDirectory>${project.basedir}/python</workingDirectory>
                            <commandlineArgs>
                                -c "python -m venv venv &amp;&amp; source venv/bin/activate &amp;&amp; pip install -r requirements.txt"
                            </commandlineArgs>
                        </configuration>
                    </execution>
                    <execution>
                        <id>generate-protobuf-python</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>exec</goal>
                        </goals>
                        <configuration>
                            <!-- generate Python files from proto -->
                            <executable>python</executable>
                            <workingDirectory>${project.basedir}</workingDirectory>
                            <commandlineArgs>
                                -c "from grpc_tools import protoc;\
                                protoc.main(['', '--python_out=python', '--grpc_python_out=python',
                                '--proto_path=proto', 'social-media-stream.proto'])"
                            </commandlineArgs>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>